JP2001079983A - Surface-coated metal plate having excellent workability and corrosion resistance of worked part - Google Patents
Surface-coated metal plate having excellent workability and corrosion resistance of worked partInfo
- Publication number
- JP2001079983A JP2001079983A JP26418699A JP26418699A JP2001079983A JP 2001079983 A JP2001079983 A JP 2001079983A JP 26418699 A JP26418699 A JP 26418699A JP 26418699 A JP26418699 A JP 26418699A JP 2001079983 A JP2001079983 A JP 2001079983A
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- JP
- Japan
- Prior art keywords
- film
- metal plate
- elongation
- corrosion resistance
- plating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 62
- 239000002184 metal Substances 0.000 title claims abstract description 62
- 230000007797 corrosion Effects 0.000 title claims abstract description 32
- 238000005260 corrosion Methods 0.000 title claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 48
- 239000011347 resin Substances 0.000 claims abstract description 48
- 230000009477 glass transition Effects 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims description 51
- 239000011248 coating agent Substances 0.000 claims description 43
- 239000010410 layer Substances 0.000 abstract description 75
- 238000007747 plating Methods 0.000 abstract description 40
- 230000002265 prevention Effects 0.000 abstract description 7
- 239000002356 single layer Substances 0.000 abstract description 5
- 239000010408 film Substances 0.000 description 133
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 238000012545 processing Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 10
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 description 6
- 239000008397 galvanized steel Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
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- 239000000049 pigment Substances 0.000 description 4
- 239000004645 polyester resin Substances 0.000 description 4
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- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
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- 238000004040 coloring Methods 0.000 description 2
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- 239000007921 spray Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 101100257194 Homo sapiens SMIM8 gene Proteins 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 102100024789 Small integral membrane protein 8 Human genes 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加工性及び加工部
耐食性が改善された表面被覆金属板に関するものであ
る。本発明の表面被覆金属板は、最表層には、所定のガ
ラス転移点を有する皮膜を有し、それよりも内側には、
伸びの優れた樹脂皮膜を任意に有してなり、この様な複
数皮膜とすることにより、めっき剥離防止及び加工部耐
食性の両特性を兼ね備えた金属板が得られる点で極めて
有用である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-coated metal sheet having improved workability and corrosion resistance in a processed portion. The surface-coated metal plate of the present invention has a coating having a predetermined glass transition point on the outermost layer, and further inside,
By arbitrarily providing a resin film having excellent elongation, the use of such a plurality of films is extremely useful in that a metal plate having both characteristics of plating peeling prevention and corrosion resistance of a processed portion can be obtained.
【０００２】[0002]
【従来の技術】家電製品等の内部部品には、耐食性を目
的としてめっき鋼板が汎用されており、更に耐指紋性や
加工性等の向上を目指して、上記めっき鋼板に薄膜樹脂
が塗装された樹脂塗装めっき鋼板が使用されている。2. Description of the Related Art Plated steel sheets are widely used for internal parts such as home electric appliances for corrosion resistance, and a thin film resin is applied to the above-mentioned plated steel sheets for the purpose of improving fingerprint resistance and workability. A resin-coated plated steel sheet is used.
【０００３】ところが、適用用途によっては、より高度
の耐食性が要求される様になり、この様な要求特性に対
応すべく、上記樹脂塗装めっき鋼板において、めっきの
種類やめっき付着量を制御した鋼板が種々提案されてい
る。しかしながら、めっきの種類によっては、めっき
硬度が高くなり過ぎる為、加工により、めっき層のクラ
ックに起因する剥離が発生する；めっき付着量を高め
た場合も同様に、加工の際、めっき層にクラックに起因
する剥離が発生する；等の問題が顕著に見られた。この
様な加工時におけるめっきの剥離は、従来の薄膜樹脂塗
装鋼板では有効に防止することができず、加工部耐食性
（めっきが剥離した部分の耐食性）が著しく劣化してい
た。However, depending on the application, a higher degree of corrosion resistance is required, and in order to meet such required characteristics, in the above resin-coated plated steel sheet, the type of plating and the amount of plating applied are controlled. Have been proposed. However, depending on the type of plating, the plating hardness is too high, so that the processing causes peeling due to cracks in the plating layer. Similarly, when the plating adhesion amount is increased, the plating layer cracks during processing. Peeling caused by the phenomenon; The peeling of the plating during such processing cannot be effectively prevented by the conventional thin-film resin-coated steel sheet, and the corrosion resistance of the processed portion (corrosion resistance of the portion where the plating has been peeled) has been significantly deteriorated.
【０００４】そこで、この様な問題を回避すべく、めっ
き鋼板に、伸びの優れた樹脂皮膜が被覆された鋼板が使
用されている。この様なめっき鋼板を使用すれば、プレ
ス加工やロールフォーミング等の加工により、めっきに
クラックが発生したとしても、クラックの発生による局
部的な応力に上記樹脂皮膜がうまく追随することがで
き、クラックに起因するめっきの剥離を有効に防止する
ことができるからである。しかしながら、樹脂皮膜自体
の硬度は大きく低下するため、加工により樹脂皮膜が剥
離し、疵が発生する等、加工性が大きく低下するという
問題を抱えていた。Therefore, in order to avoid such a problem, a steel sheet coated with a resin film having excellent elongation is used for a plated steel sheet. If such a plated steel sheet is used, even if cracks occur in the plating due to processing such as press working or roll forming, the resin film can successfully follow local stress caused by the cracks. This is because it is possible to effectively prevent the peeling of the plating due to the above. However, since the hardness of the resin film itself is greatly reduced, there has been a problem that the workability is greatly reduced, for example, the resin film is peeled off by processing and flaws are generated.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記事情に着
目してなされたものであり、その目的は、めっき剥離防
止に加え、加工部耐食性にも優れた表面被覆金属板を提
供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surface-coated metal sheet which is excellent in corrosion resistance in a processed portion in addition to preventing plating peeling. is there.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決し得た本
発明の表面被覆金属板は、めっき金属板に複数層の皮膜
が形成された表面被覆金属板であって、上記皮膜のう
ち、最表層皮膜はガラス転移点が５０〜１１０℃の皮膜
であり、最表層皮膜より内側の下層皮膜には、伸びの優
れた樹脂皮膜を任意に有することにより、加工性及び加
工部耐食性が改善されたものであるところに要旨を有す
るものである。Means for Solving the Problems The surface-coated metal plate of the present invention which has solved the above-mentioned problems is a surface-coated metal plate comprising a plated metal plate and a plurality of layers formed on the metal plate. The outermost layer film is a film having a glass transition point of 50 to 110 ° C. The lower layer film inside the outermost layer film optionally has a resin film having excellent elongation, thereby improving workability and corrosion resistance in the processed portion. It has a gist where it is.
【０００７】ここで、下層側に形成される樹脂皮膜が１
０％以上の伸びを有するもの、当該樹脂皮膜のガラス転
移点が１０〜８０℃であるもの、当該樹脂皮膜の膜厚が
単層当たりで０．２〜４．０μｍであるもの；また、最
表層皮膜の膜厚が０．２〜４．０μｍであるものは、い
ずれも本発明の好ましい態様である。Here, the resin film formed on the lower layer side is 1
One having an elongation of 0% or more, one having a glass transition point of 10 to 80 ° C. of the resin film, one having a film thickness of 0.2 to 4.0 μm per single layer; The case where the thickness of the surface layer film is 0.2 to 4.0 μm is a preferred embodiment of the present invention.
【０００８】また、最表層皮膜をクリヤー皮膜としたも
のは耐疵付き性が一層高められる。この態様は、特に、
下層皮膜を着色皮膜とし、最表層皮膜をクリヤー皮膜と
した場合に有効であり、万が一、加工により最表層皮膜
に疵が生じたとしても、最上層皮膜はクリヤー皮膜で形
成されているため疵が目立ち難くなることから、とりわ
け、意匠性が要求される着色金属板の用途に適用するこ
とが推奨される。When the outermost layer film is a clear film, scratch resistance is further enhanced. This aspect, in particular,
This is effective when the lower layer film is a colored film and the outermost layer film is a clear film.Even if the outermost layer film is scratched by processing, the uppermost layer film is formed by a clear film, so the It is recommended to be applied particularly to the use of a colored metal plate requiring a design property, since it becomes less noticeable.
【０００９】[0009]
【発明の実施の形態】本発明者らは、プレス加工やロー
ルフォーミング等の加工時における、めっき層のクラッ
クに起因する耐めっき剥離性に優れると共に、加工部耐
食性にも優れた表面被覆金属板を提供すべく、特に、伸
びの優れた樹脂皮膜が形成されためっき金属板を中心に
検討を重ねてきた。前述した通り、伸びの優れた樹脂皮
膜が形成されためっき金属板を使用すれば、クラックに
起因するめっき剥離を有効に防止できるからである。し
かし、その反面、上記金属板は、加工部の樹脂皮膜が剥
離し、加工部耐食性が低下するという問題を抱えてお
り、この様な問題を解決すべく研究を重ねた。その結
果、最表層側には、所定のガラス転移点（Ｔｇ）を有す
る皮膜を、一方、最表層より内側には、伸びの優れた樹
脂皮膜を被覆すれば所期の目的が達成されことを見出
し、本発明を完成した。本発明によれば、従来の樹脂塗
装金属板では達成できなかった「耐めっき剥離性」及び
「加工部耐食性」の双法に優れた表面被覆金属板を提供
することができた点で、極めて意義深い。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have developed a surface-coated metal sheet which is excellent in resistance to plating peeling due to cracks in a plating layer during processing such as press working and roll forming and also has excellent corrosion resistance in a processed part. In particular, studies have been focused on plating metal plates on which a resin film with excellent elongation is formed. As described above, if a plated metal plate on which a resin film having excellent elongation is formed is used, plating peeling due to cracks can be effectively prevented. However, on the other hand, the metal plate has a problem that the resin film of the processed portion is peeled off and the corrosion resistance of the processed portion is reduced, and studies have been repeated to solve such a problem. As a result, if the outermost layer is coated with a film having a predetermined glass transition point (Tg), while the innermost layer is coated with a resin film having excellent elongation, the intended purpose can be achieved. Heading, the present invention has been completed. According to the present invention, it is possible to provide a surface-coated metal sheet excellent in both methods of "plating resistance" and "corrosion resistance of the processed part", which could not be achieved by the conventional resin-coated metal sheet, significant.
【００１０】以下、本発明を構成する各要件について説
明する。Hereinafter, each requirement constituting the present invention will be described.
【００１１】本発明の表面被覆金属板は、めっき金属板
に複数層の皮膜が形成された表面被覆金属板であり、上
記皮膜のうち、最表層皮膜はＴｇが５０〜１１０℃の皮
膜を、また、最表層皮膜より内側（下層側）には、伸び
の優れた樹脂皮膜を任意に有するものである。The surface-coated metal sheet of the present invention is a surface-coated metal sheet in which a plurality of coatings are formed on a plated metal sheet. Among the above coatings, the outermost coating is a coating having a Tg of 50 to 110 ° C. Further, a resin film having excellent elongation is optionally provided on the inner side (lower layer side) of the outermost layer film.
【００１２】この様に本発明の表面被覆金属板は、めっ
き金属板に複数層の皮膜が形成されており、この皮膜構
成に特徴を有するものである。本発明によれば、第一
に、最表層皮膜（以下、上層皮膜と呼ぶ場合がある）よ
り内側の皮膜は、伸びの優れた皮膜（以下、当該「伸び
の優れた皮膜」を下層皮膜と呼ぶ場合がある）を任意に
有していることが必要である。この様な皮膜を使用すれ
ば、加工の際、クラックに起因するめっき剥離を有効に
防止することができるからである。耐めっき剥離性の防
止という観点からすれば、上層皮膜の真下に、伸びの優
れた下層皮膜が形成されていることが推奨される（この
場合、該下層皮膜の下に更に単数または複数の皮膜が形
成されていても良いが、かかる単数または複数の皮膜の
構成は特に限定されず、伸びの優れた皮膜が形成されて
いても良いし、形成されていなくても良い）。勿論、本
発明ではこれに限定する趣旨では決してなく、複数層の
皮膜のうち、最表層皮膜を除く下層側の皮膜の少なくと
も一層に、伸びの優れた皮膜が形成されていれば良い。
従って、例えば、めっき金属板に三層の皮膜が形成され
ているときは、最表層皮膜を除く最下層皮膜及び中間皮
膜には、伸びの優れた皮膜を両方有していても良いし、
いずれか一方に伸びの優れた皮膜を有していても良い。
但し、耐めっき剥離性や製造効率などを考慮すれば、め
っき金属板の上に、伸びの優れた皮膜、及び所定のＴｇ
を有する皮膜が順次被覆された二層皮膜の表面被覆金属
板が最も推奨される。As described above, the surface-coated metal sheet of the present invention has a plurality of layers formed on the plated metal sheet, and is characterized by this film configuration. According to the present invention, first, a coating inside the outermost layer coating (hereinafter, sometimes referred to as an upper layer coating) is a coating with excellent elongation (hereinafter, the “film with excellent elongation” is referred to as a lower coating). (Sometimes called). This is because the use of such a film can effectively prevent plating peeling due to cracks during processing. From the viewpoint of preventing plating peeling resistance, it is recommended that a lower coating having excellent elongation be formed directly below the upper coating (in this case, one or more coatings may be further formed under the lower coating). May be formed, but the structure of the single or plural films is not particularly limited, and a film having excellent elongation may or may not be formed). Of course, the present invention is not intended to be limited to this, and a film having excellent elongation may be formed on at least one of the lower-layer films excluding the outermost layer film among the plurality of films.
Therefore, for example, when a three-layer film is formed on a plated metal plate, the lowermost film and the intermediate film except the outermost film may have both films having excellent elongation,
Either one may have a film with excellent elongation.
However, in consideration of plating resistance and production efficiency, a film with excellent elongation and a predetermined Tg
The most recommended is a two-layer coating surface-coated metal sheet sequentially coated with a coating having the following formula:
【００１３】ここで、本発明において「伸びの優れた」
とは、ＪＩＳ Ｋ ７１１３に記載の引張試験に基づい
て測定される引張破壊伸びが１０％以上であるものを意
味する。伸びが１０％未満では、クラックの発生による
局部的な応力にめっき皮膜が対応できず、めっき層の剥
離が生じてしまう。より好ましくは２０％以上、更によ
り好ましくは３０％以上である。Here, in the present invention, "excellent elongation" is used.
Means that the tensile elongation at break measured based on the tensile test described in JIS K 7113 is 10% or more. If the elongation is less than 10%, the plating film cannot cope with local stress caused by the occurrence of cracks, and peeling of the plating layer will occur. It is more preferably at least 20%, even more preferably at least 30%.
【００１４】本発明における第二の必須要件として、最
表層皮膜には、Ｔｇが５０〜１１０℃の皮膜を有するこ
とが必要である。この様な複数の皮膜とすることによ
り、金属板に伸びの優れた皮膜のみを被覆した単層皮膜
金属板に比べ、加工部耐食性を著しく高めることができ
るのである。即ち、本発明の金属板は、伸びの優れた下
層皮膜の形成に伴う加工部耐食性の劣化を防止すべく、
最上層皮膜には、所定のＴｇを有する皮膜を形成したと
ころに最重要ポイントが存在するものであり、この様な
複数の皮膜構成を採用することにより、めっき剥離防止
に加え、加工部耐食性を改善せしめたところに本発明の
技術的意義が存在する。As a second essential requirement in the present invention, the outermost layer film must have a film having a Tg of 50 to 110 ° C. By using such a plurality of coatings, the corrosion resistance of the processed portion can be remarkably increased as compared with a single-layer coated metal plate in which only a coating having excellent elongation is coated on the metal plate. That is, the metal plate of the present invention, in order to prevent the deterioration of the corrosion resistance of the processed portion due to the formation of the lower elongation film with excellent elongation,
In the uppermost layer film, the most important point exists where a film having a predetermined Tg is formed. By adopting such a plurality of film configurations, in addition to preventing plating peeling, the corrosion resistance of the processed portion is improved. The technical significance of the present invention lies in the improvement.
【００１５】この様に最上層皮膜のＴｇは５０〜１１０
℃でなければならない。５０℃未満では、皮膜の硬度が
不充分であるため、下層皮膜を充分保護することができ
ず、剥離してしまう。より好ましくは６０℃以上、更に
より好ましくは７０℃以上である。但し、Ｔｇが１１０
℃を超えると、皮膜が硬くなり過ぎてしまい、上層皮膜
のクラック発生を招き、表面外観の劣化を招く。この様
なクラック発生による弊害は、クリヤー皮膜を最上層皮
膜として用いた場合に、特に顕著に見られる。より好ま
しくは１００℃以下、更により好ましくは９０℃以下で
ある。As described above, the Tg of the uppermost film is 50 to 110.
° C. If the temperature is lower than 50 ° C., the hardness of the film is insufficient, so that the lower film cannot be sufficiently protected and peels off. It is more preferably at least 60 ° C, still more preferably at least 70 ° C. However, Tg is 110
If the temperature exceeds ℃, the film becomes too hard, which causes cracks in the upper layer film and deteriorates the surface appearance. Such adverse effects caused by the occurrence of cracks are particularly noticeable when the clear film is used as the uppermost film. The temperature is more preferably 100 ° C or lower, and even more preferably 90 ° C or lower.
【００１６】この様に本発明では、従来の表面被覆金属
板では達成できなかった「めっき剥離防止」と「加工部
耐食性（加工部樹脂皮膜の剥離防止）」の両作用を具備
させるべく、下層皮膜側では「めっき剥離防止」を、最
上層皮膜側では「加工部耐食性」を、夫々有効に発揮さ
せることにより、上記課題を見事に達成し得たところに
ポイントがある。本発明によれば、各皮膜が夫々、所定
の作用を有効に発揮させる様、下層皮膜では「伸びの優
れた」皮膜を採用し、上層皮膜では「Ｔｇの高い」皮膜
を採用しているので、所望の特性が有効に発揮されるの
である。As described above, in the present invention, the lower layer is provided so as to have both the effects of "prevention of plating peeling" and "corrosion resistance of the processed portion (prevention of peeling of the resin film of the processed portion)" which cannot be achieved by the conventional surface-coated metal sheet. The point is that the above problem was successfully achieved by effectively exhibiting "prevention of plating peeling" on the film side and "corrosion resistance of the processed portion" on the top layer film side. According to the present invention, the lower film employs a film having "excellent elongation" and the upper film employs a film having a "high Tg" so that each film effectively exerts a predetermined action. Thus, the desired characteristics are effectively exhibited.
【００１７】以上が本発明に用いられる複数皮膜に要求
される必須要件であるが、上記作用の更なる向上を目指
して、以下の態様にすることが推奨される。The above is an essential requirement required for a plurality of coatings used in the present invention. The following mode is recommended for the purpose of further improving the above action.
【００１８】まず、下層皮膜側では、伸びに加え、Ｔｇ
を１０〜８０℃に制御することが好ましい。前述した通
り、下層皮膜側では「めっき剥離防止」を有効に発揮さ
せるべく、「優れた伸び」を有することが不可欠であ
り、この伸び特性を備える限り、Ｔｇについては特に限
定されないが、Ｔｇを上記範囲に制御したものは、特に
優れた特性を発揮することが分かった。Ｔｇが１０℃未
満では、たとえ前述の最上層皮膜を被覆したとしても耐
疵付き性に劣り、加工時に皮膜の剥離が発生する。より
好ましくは２０℃以上、更により好ましくは３０℃以上
である。尚、Ｔｇが８０℃を超えるとプレス加工時、皮
膜にクラックが発生する等の不具合が生じる。より好ま
しくは７０℃以下、更により好ましくは６０℃以下であ
る。尚、下層皮膜と最上層皮膜のＴｇ値とは、同程度で
あっても良いし、異なっていても良い。First, in addition to elongation, Tg
Is preferably controlled to 10 to 80 ° C. As described above, it is indispensable to have “excellent elongation” in order to effectively exert “prevention of plating peeling” on the underlayer coating side, and Tg is not particularly limited as long as it has this elongation property. It was found that those controlled within the above range exhibited particularly excellent characteristics. If the Tg is lower than 10 ° C., even if the above-mentioned uppermost layer coating is coated, the film has poor scratch resistance and peels off during processing. It is more preferably at least 20 ° C., even more preferably at least 30 ° C. If the Tg exceeds 80 ° C., problems such as cracks in the film occur during press working. It is more preferably at most 70 ° C, still more preferably at most 60 ° C. The Tg values of the lower layer film and the uppermost layer film may be the same or different.
【００１９】また、下層皮膜の膜厚は単層当たり０．２
〜４．０μｍとすることが好ましい。０．２μｍ未満で
は、めっき層のクラックに起因するめっき剥離を有効に
防止できないからである。より好ましくは０．４μｍ以
上、更により好ましくは０．６μｍ以上である。但し、
４．０μｍを超えると耐疵付き性が低下してしまう。よ
り好ましくは３．５μｍ以下、更により好ましくは３．
０μｍ以下である。尚、伸びの優れた樹脂皮膜が複数形
成されている場合は、当該樹脂皮膜の総膜厚は、単層当
たりの好ましい膜厚（０．２〜４．０μｍ）を複数層合
計した膜厚に制御することが推奨される。The thickness of the lower layer film is 0.2 per single layer.
It is preferable to set it to 4.0 μm. If the thickness is less than 0.2 μm, plating peeling due to cracks in the plating layer cannot be effectively prevented. It is more preferably at least 0.4 μm, even more preferably at least 0.6 μm. However,
If the thickness exceeds 4.0 μm, the scratch resistance is reduced. More preferably, it is 3.5 μm or less, and still more preferably, it is 3.
0 μm or less. When a plurality of resin films having excellent elongation are formed, the total film thickness of the resin film is a film thickness obtained by adding a plurality of preferable film thicknesses (0.2 to 4.0 μm) per single layer. Control is recommended.
【００２０】一方、最上層皮膜の膜厚は０．２〜４．０
μｍとすることが好ましい。０．２μｍ未満では、耐疵
付き性向上効果に乏しい。より好ましくは０．３μｍ以
上、更により好ましくは０．４μｍ以上である。但し、
４．０μｍを超えると、加工部の上層皮膜自体に発生し
たクラックが目立ち、加工後の外観に劣る。より好まし
くは３．５μｍ以下、更により好ましくは３．０μｍ以
下である。On the other hand, the thickness of the uppermost film is 0.2 to 4.0.
It is preferably set to μm. If it is less than 0.2 μm, the effect of improving the scratch resistance is poor. It is more preferably at least 0.3 μm, even more preferably at least 0.4 μm. However,
If it exceeds 4.0 μm, cracks generated in the upper layer coating itself of the processed part are conspicuous, and the appearance after processing is inferior. It is more preferably at most 3.5 μm, even more preferably at most 3.0 μm.
【００２１】尚、最上層皮膜の伸びは特に限定されな
い。前述した通り、本発明では、加工部耐食性を向上さ
せるべく、最上層皮膜のＴｇを特定した次第であり、Ｔ
ｇが上記範囲を満足する限り、適用用途等に応じて適宜
好適な伸びを有する樹脂皮膜を選択すれば良い。勿論、
伸びのない樹脂皮膜を選択することも可能である。例え
ば本発明の金属板を深絞り用途へ適用する場合には、Ｔ
ｇが上記範囲を満足し、且つ伸びの優れた樹脂皮膜を最
上層皮膜として選択することが好ましく；一方、本発明
の金属板を、比較的伸びを必要としない用途へ適用する
場合には、Ｔｇのみが上記範囲を満足する樹脂皮膜を最
上層皮膜として特定すれば良く、この場合は、伸びのな
い樹脂を選択しても構わない。The elongation of the uppermost film is not particularly limited. As described above, in the present invention, the Tg of the uppermost layer film has been specified in order to improve the corrosion resistance of the processed portion.
As long as g satisfies the above range, a resin film having a suitable elongation may be appropriately selected depending on the application and the like. Of course,
It is also possible to select a resin film without elongation. For example, when applying the metal plate of the present invention to a deep drawing application, T
g satisfies the above range, and it is preferable to select a resin film having excellent elongation as the uppermost film; on the other hand, when applying the metal plate of the present invention to an application that does not require relatively elongation, A resin film having only Tg satisfying the above range may be specified as the uppermost film, and in this case, a resin having no elongation may be selected.
【００２２】尚、従来においても、複数層の皮膜を施し
た表面被覆金属板（例えば二層皮膜金属板）は提案され
ている。しかしながら、従来の二層皮膜金属板は、着色
化を目的とするため、本発明の好適な薄膜態様とは異な
り、主に膜厚の大きい着色樹脂皮膜が被覆されており、
且つ、上層皮膜・下層皮膜共に、伸びの優れた樹脂皮膜
で構成されている。従来の態様によれば、下層皮膜側で
は、密着性向上を考慮して伸びの優れた樹脂皮膜を選択
しており；一方、上層皮膜側では、着色付与の目的で着
色顔料を使用しているため、クラックが発生すると皮膜
が割れて変色したりする等し、所望の着色外観が得られ
ないという理由により、優れた伸びを有する樹脂皮膜を
選択している次第である。しかしながら、この様な金属
板では、加工部耐食性に劣ることは前述した通りであ
る。Incidentally, a surface-coated metal plate (for example, a two-layer coated metal plate) provided with a plurality of layers of coatings has been conventionally proposed. However, the conventional two-layer coated metal plate, for the purpose of coloring, is different from the preferred thin film mode of the present invention, and is mainly coated with a colored resin film having a large thickness,
In addition, both the upper layer coating and the lower layer coating are composed of resin films having excellent elongation. According to the conventional aspect, on the lower film side, a resin film having excellent elongation is selected in consideration of the improvement in adhesion; on the other hand, on the upper film side, a color pigment is used for the purpose of imparting color. For this reason, when a crack occurs, the film is broken and discolored, and a desired colored appearance cannot be obtained, so that a resin film having excellent elongation has been selected. However, as described above, such a metal plate is inferior in the corrosion resistance of the processed portion.
【００２３】従って、従来の二層皮膜金属板は、その目
的においても、皮膜の構成においても、更に各皮膜の形
成意義においても、本発明の複数皮膜金属板とは全く相
違するものである。Therefore, the conventional two-layer metal sheet is completely different from the multi-layer metal sheet of the present invention in its purpose, in the constitution of the film, and in the significance of forming each film.
【００２４】ここで、本発明において、上層皮膜として
クリヤー皮膜を使用したものは好ましい態様である。こ
れにより、耐疵付き性が一段と高められるからである。
この様な態様は、例えば、下層皮膜として、着色顔料含
有皮膜を採用した場合に特に有効である。着色皮膜は、
疵や指紋が目立ち易く、加工により皮膜に疵が発生する
と割れや変色等が生じ、所望の外観が得られないという
問題を抱えており、従来の如く樹脂皮膜を着色した単層
皮膜金属板では、加工性、耐指紋性に劣り、適用用途が
極めて制限される等の不具合があったからである。これ
に対し、前述した本発明の構成からなり、且つ、下層皮
膜を着色皮膜とし、最上層皮膜をクリヤー皮膜とした場
合には、万が一、加工により最上層皮膜に疵が生じたと
しても、最上層にはクリヤー皮膜が形成されているため
疵が目立ち難くなり、上記不具合も全く見られない。従
って、上記態様は、特に意匠性が要求される着色金属板
の用途において、極めて有効である。In the present invention, the use of a clear coating as the upper coating is a preferred embodiment. Thereby, the flaw resistance is further enhanced.
Such an embodiment is particularly effective when, for example, a color pigment-containing coating is employed as the lower coating. The colored film is
Scratches and fingerprints are prominent, cracks and discoloration occur when scratches occur on the film due to processing, and there is a problem that the desired appearance can not be obtained. This is because there were inconveniences such as poor processability and fingerprint resistance, and extremely limited application. On the other hand, in the case of the above-described configuration of the present invention, when the lower layer film is a colored film and the uppermost layer film is a clear film, even if the uppermost layer film is scratched by processing, the uppermost layer film is not damaged. Since a clear film is formed on the upper layer, flaws become less noticeable, and the above-mentioned problems are not observed at all. Therefore, the above embodiment is extremely effective particularly in the use of a colored metal plate requiring designability.
【００２５】本発明に用いられる金属板としては、表面
被覆金属板に使用されるものであれば特に限定されず、
例えば、軟鋼やステレス鋼板を始めとする各種合金鋼
板；Ａｌ・Ａｌ合金板、Ｃｕ・Ｃｕ合金板、Ｔｉ・Ｔｉ
合金板等の金属板に、各種めっき（Ｚｎ・Ｚｎ合金めっ
き、Ａｌ・Ａｌ合金めっき、Ｃｕ系めっき、Ｎｉ系めっ
き、Ｃｒ系めっき等）が施されためっき金属板が挙げら
れる。具体的には、例えば、電気亜鉛めっき鋼板、電気
Ｚｎ−Ｎｉ合金めっき鋼板、溶融亜鉛めっき鋼板、合金
化溶融亜鉛めっき鋼板、Ａｌ５％−Ｚｎ合金めっき鋼
板、Ａｌ５５％−Ｚｎ合金めっき鋼板等が例示される。
なかでも、めっき付着量の多い溶融亜鉛めっき鋼板、め
っき層が硬い合金化溶融亜鉛めっき鋼板の使用が特に推
奨される。これらのめっき金属板に、皮膜密着性や耐食
性の向上を目的として、リン酸塩処理、クロメート処理
等の化成処理を施した金属板も本発明の範囲内に包含さ
れる。The metal plate used in the present invention is not particularly limited as long as it is used for a surface-coated metal plate.
For example, various alloy steel plates including mild steel and stainless steel plates; Al / Al alloy plates, Cu / Cu alloy plates, Ti / Ti
A plated metal plate obtained by performing various plating (Zn / Zn alloy plating, Al / Al alloy plating, Cu-based plating, Ni-based plating, Cr-based plating, etc.) on a metal plate such as an alloy plate is exemplified. Specifically, for example, an electrogalvanized steel sheet, an electric Zn-Ni alloy-coated steel sheet, a hot-dip galvanized steel sheet, an alloyed hot-dip galvanized steel sheet, an Al5% -Zn alloy-coated steel sheet, an Al55% -Zn alloy-coated steel sheet, etc. are exemplified. Is done.
Among them, the use of a hot-dip galvanized steel sheet having a large amount of coating and a galvannealed steel sheet having a hard coating layer are particularly recommended. Metal plates obtained by subjecting these plated metal plates to a chemical conversion treatment such as a phosphate treatment or a chromate treatment for the purpose of improving film adhesion and corrosion resistance are also included in the scope of the present invention.
【００２６】また、上層皮膜・下層皮膜に用いられる樹
脂の種類は特に限定されず、アクリル系樹脂、ウレタン
系樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、
フッ素系樹脂、シリコン系樹脂、およびそれらの混合ま
たは変性した樹脂等を適宜使用することができる。The type of the resin used for the upper layer coating and the lower layer coating is not particularly limited, and acrylic resins, urethane resins, polyolefin resins, polyester resins,
Fluorine-based resins, silicon-based resins, and mixed or modified resins thereof can be used as appropriate.
【００２７】また、上記クリヤー皮膜を構成する樹脂も
特に限定されず、上記の上層皮膜・下層皮膜に用いられ
る樹脂を使用することができる。The resin constituting the clear film is not particularly limited, and resins used for the upper film and the lower film described above can be used.
【００２８】これらの皮膜中には、本発明の作用を損な
わない範囲で公知の添加剤を使用することができ、例え
ばシリカ、潤滑剤、架橋剤、ワックス、防錆顔料、艶消
し剤等を添加しても良い。また、上述した通り、下層皮
膜中には、着色顔料を添加することが推奨される。Known additives can be used in these films as long as the effects of the present invention are not impaired. For example, silica, a lubricant, a crosslinking agent, a wax, a rust preventive pigment, a matting agent and the like can be used. It may be added. As described above, it is recommended to add a coloring pigment to the underlayer coating.
【００２９】次に本発明の金属板を製造する方法につい
て説明する。本発明の金属板は、上記成分を含む塗料
を、公知の塗装方法で原板の表面に塗布し、乾燥させて
製造することができる。塗装方法は特に限定されない
が、例えば表面を清浄化して、必要に応じて塗装前処理
（例えばリン酸塩処理、クロメート処理など）を施した
長尺金属帯表面に、ロールコーター法、スプレー法、カ
ーテンフローコーター法などを用いて塗料を塗工し、熱
風乾燥炉を通過させて乾燥させる方法などが挙げられ
る。被膜厚さの均一性や処理コスト、塗装効率などを総
合的に勘案して実用上好ましいのは、ロールコーター法
である。Next, a method for manufacturing the metal plate of the present invention will be described. The metal plate of the present invention can be manufactured by applying a paint containing the above components to the surface of an original plate by a known coating method and then drying it. The coating method is not particularly limited. For example, a roll coater method, a spray method, and the like may be applied to the surface of a long metal strip that has been subjected to a pre-coating treatment (for example, a phosphate treatment or a chromate treatment) by cleaning the surface, if necessary. A method in which a paint is applied using a curtain flow coater method or the like, and then dried by passing through a hot-air drying oven, or the like. The roll coater method is practically preferable in consideration of the uniformity of the coating thickness, the processing cost, the coating efficiency and the like.
【００３０】尚、樹脂塗装を施す金属板には、樹脂被膜
との密着性または耐食性の向上目的で、塗装前処理とし
てリン酸塩処理またはクロメート処理を施しても構わな
い。但し、クロメート処理材については、樹脂塗装金属
板使用中のクロム溶出性の観点から、クロメート処理時
のＣｒ付着量を３５ｍｇ／ｍ2以下に抑制することが好
ましい。この範囲であれば、本発明の表面処理金属板
は、下地クロメート処理層からのクロム溶出を抑えるこ
とが可能である。また、従来のクロメート処理材は必要
に応じて設けられる上塗り塗装の耐水密着性が、６価ク
ロムの溶出に伴って、湿潤環境下において低下する傾向
にあるが、本発明の表面処理金属板では溶出が抑制され
るため、上塗り被膜の耐水密着性が悪化することはな
い。The metal plate to be coated with the resin may be subjected to a phosphate treatment or a chromate treatment as a pre-coating treatment for the purpose of improving the adhesion to the resin film or the corrosion resistance. However, for the chromate-treated material, it is preferable to suppress the amount of Cr adhering during the chromate treatment to 35 mg / m 2 or less from the viewpoint of chromium elution during use of the resin-coated metal plate. Within this range, the surface-treated metal plate of the present invention can suppress elution of chromium from the base chromate-treated layer. In addition, the conventional chromate-treated material has a tendency that the water-resistant adhesiveness of the top coat provided as needed decreases in a humid environment with the elution of hexavalent chromium, but in the surface-treated metal plate of the present invention, Since the elution is suppressed, the water-resistant adhesion of the overcoat film does not deteriorate.
【００３１】以下実施例によって本発明をさらに詳述す
るが、下記実施例は本発明を制限するものではなく、本
発明の趣旨を逸脱しない範囲で変更実施することはすべ
て本願発明に含まれる。Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples do not limit the present invention, and all changes and modifications within the scope of the present invention are included in the present invention.
【００３２】[0032]
【実施例】実施例１ 表１〜４に示す種々の原板（板厚０．８ｍｍ）にクロメ
ート処理（Ｃｒ付着量２０ｍｇ／ｍ2）を施しためっき
鋼板に、Ｔｇ及び皮膜厚を種々変化させた下層皮膜及び
上層皮膜をロールコーター法により被覆した。尚、上層
皮膜は全てクリヤー皮膜とした。この様にして得られた
二層皮膜鋼板のＴｇ、伸び、加工性及び加工部耐食性を
下記評価方法で評価した。EXAMPLES Example 1 Tg and film thickness were variously changed on a plated steel sheet obtained by subjecting various original sheets (sheet thickness 0.8 mm) shown in Tables 1 to 4 to chromate treatment (Cr adhesion amount 20 mg / m 2 ). The lower layer coating and the upper layer coating were coated by a roll coater method. In addition, all the upper layer films were clear films. The Tg, elongation, workability, and corrosion resistance of the processed portion of the thus obtained double-layer coated steel sheet were evaluated by the following evaluation methods.
【００３３】（１）Ｔｇ ＪＩＳ Ｋ ７１２１に記載の示差走査熱量計（ＤＳ
Ｃ）を用い、Ｔｇを測定した。(1) Tg Differential scanning calorimeter (DS) described in JIS K 7121
Tg was measured using C).
【００３４】（２）伸び ＪＩＳ Ｋ ７１１３に記載の引張試験を行い、下記条
件にて引張破壊伸びを測定した。 試験片 ：２号型試験片 フィルム：バーコート塗装後、乾燥した厚さ４０〜５０
μｍのフィルム 引張速度：２００ｍｍ／ｍｉｎ(2) Elongation A tensile test described in JIS K 7113 was performed, and tensile elongation at break was measured under the following conditions. Test piece: No. 2 type test piece Film: Dry thickness 40-50 after coating with bar coat
μm film Tensile speed: 200 mm / min
【００３５】（３）加工性 ８０トンプレス機により円筒成形を行ったサンプルにつ
いて、摺動部の皮膜剥離の有無、及び外観変化を観察し
た。プレス条件及び加工性の評価基準は以下の通りであ
る。 (3) Workability The sample formed into a cylindrical shape with an 80-ton press was used to observe the presence / absence of peeling of the film on the sliding portion and the change in appearance. Press conditions and evaluation criteria for workability are as follows.
【００３６】（４）加工部耐食性 上記（３）の加工性試験サンプルを用い、ＪＩＳ Ｚ
２３７１に記載の塩水噴霧試験（試験時間：１２０時
間）を行い、摺動部の白錆発生率を下記評価基準で評価
した。 (4) Corrosion Resistance of Processed Section Using the workability test sample of (3) above, JIS Z
The salt spray test (test time: 120 hours) described in 2371 was performed, and the white rust generation rate of the sliding portion was evaluated according to the following evaluation criteria.
【００３７】（５）耐疵付き性試験 試験サンプル表面に、１０円硬貨を４５°に傾けた状態
で荷重２００ｇで押付け、１０ｃｍ／ｓの速度でサンプ
ル表面を擦った後の皮膜外観変化を下記基準で評価し
た。 評価基準 ◎：異常なし ○：僅かに痕跡あり(5) Scratch resistance test A 10-yen coin was pressed against the surface of a test sample at a load of 200 g while being tilted at 45 °, and the change in the film appearance after rubbing the sample surface at a speed of 10 cm / s is shown below. Evaluation was based on criteria. Evaluation criteria ◎: No abnormality ○: Slight trace
【００３８】これらの結果を表１〜４に併記する。尚、
表中、ＧＡは合金化溶融亜鉛めっき鋼板、ＧＩは溶融亜
鉛めっき鋼板、ＧＦは溶融Ｚｎ−５％Ａｌ合金めっき鋼
板、ＥＧは電気亜鉛めっき鋼板を夫々意味する。The results are shown in Tables 1 to 4. still,
In the table, GA means an alloyed hot-dip galvanized steel sheet, GI means a hot-dip galvanized steel sheet, GF means a hot-dip Zn-5% Al alloy-coated steel sheet, and EG means an electro-galvanized steel sheet.
【００３９】[0039]
【表１】 [Table 1]
【００４０】[0040]
【表２】 [Table 2]
【００４１】[0041]
【表３】 [Table 3]
【００４２】[0042]
【表４】 [Table 4]
【００４３】このうち表１及び２は、上層皮膜・下層皮
膜にポリエステル系樹脂を使用した場合における結果を
示したものである。これらの表に示すＮｏ．１〜５６
は、いずれも下層皮膜の伸び及び上層皮膜のＴｇが本発
明の要件を満足する実施例であり、原板の種類を種々変
えたとしても、いずれも加工性及び加工後耐食性に優れ
ていることが分かる。また、表には示していないが、耐
疵付き性試験の結果はいずれも「異常なし」であった。Tables 1 and 2 show the results when the polyester resin is used for the upper layer coating and the lower layer coating. No. shown in these tables. 1-56
Are examples in which the elongation of the lower layer coating and the Tg of the upper layer coating satisfy the requirements of the present invention, and that even if the type of the original plate is variously changed, both have excellent workability and post-processing corrosion resistance. I understand. Further, although not shown in the table, the results of the scratch resistance test were all “no abnormality”.
【００４４】これに対し、表４に記載のＮｏ．６２〜７
０は、下層皮膜の伸び及びＴｇ，並びに上層皮膜のＴｇ
が本発明の要件または好ましい要件を外れるため、加工
性及び／又は加工部耐食性に劣っていた。On the other hand, no. 62-7
0 is the elongation and Tg of the lower film, and the Tg of the upper film.
Was out of the requirements or preferred requirements of the present invention, and thus was inferior in workability and / or corrosion resistance in a processed part.
【００４５】詳細には、Ｎｏ．６２／６３は上層皮膜の
Ｔｇが本発明の要件を下回る／超える例；Ｎｏ．６４／
６５は下層皮膜のＴｇが本発明の好ましい要件を下回る
／超える例；Ｎｏ．６６は下層皮膜の伸びが本発明の好
ましい要件を下回る例；Ｎｏ．６７／６８は下層皮膜の
膜厚が本発明の好ましい要件を下回る／超える例；Ｎ
ｏ．６９／７０は上層皮膜の膜厚が本発明の好ましい要
件を下回る／超える例であり、いずれも加工性及び／又
は加工部耐食性に劣ることが分かる。In detail, No. No. 62/63 is an example in which the Tg of the upper layer film is below / over the requirement of the present invention; 64 /
No. 65 is an example in which the Tg of the underlayer film is below / over the preferred requirement of the present invention; No. 66 is an example in which the elongation of the underlayer coating is less than the preferable requirements of the present invention; 67/68 is an example in which the thickness of the undercoat is below / over the preferred requirements of the present invention; N
o. 69/70 is an example in which the film thickness of the upper layer film is less than / exceeds the preferred requirements of the present invention.
【００４６】更に表４に記載のＮｏ．７１は上層皮膜を
施さない例、Ｎｏ．７２は下層皮膜を施さない例であ
り、いずれも加工性及び加工部耐食性に劣っていた。Further, in Table 4, No. No. 71 is an example in which the upper layer coating is not applied. Reference numeral 72 indicates an example in which no lower layer coating was applied, and all of them were inferior in workability and corrosion resistance in a processed part.
【００４７】次に表３は、各皮膜中の樹脂の種類を種々
変化させた場合における結果を示したものである。Next, Table 3 shows the results when the type of resin in each film was variously changed.
【００４８】表３に示す通り、本発明の要件を満足する
Ｎｏ．５７〜６１は、樹脂の種類を種々変化させたとし
ても、加工性及び加工部耐食性に優れていた。また、表
には示していないが、耐疵付き性試験の結果はいずれも
「異常なし」であった。As shown in Table 3, No. satisfying the requirements of the present invention. Nos. 57 to 61 were excellent in workability and corrosion resistance of the processed portion even when the type of the resin was variously changed. Further, although not shown in the table, the results of the scratch resistance test were all “no abnormality”.
【００４９】実施例２ 本実施例は、上層皮膜としてクリヤー皮膜を施した場合
における耐疵付き性への影響を調べたものである。 Example 2 In this example, the effect on the scratch resistance when a clear film was applied as the upper film was examined.
【００５０】原板としてＧＡを用い、実施例１と同様に
して下層皮膜（ポリエステル樹脂を使用）を形成した
後、上層皮膜として、色の異なる種々の樹脂皮膜（ポリ
エステル樹脂を使用）を被覆した。尚、めっき付着量は
４５ｇ／ｍ2である。After a lower layer film (using a polyester resin) was formed in the same manner as in Example 1 using GA as an original plate, various resin films of different colors (using a polyester resin) were coated as an upper layer film. Incidentally, the plating adhesion amount is 45 g / m 2 .
【００５１】この様にして得られた供試材について、実
施例１と同様にして加工性および加工部耐食性を評価す
ると共に、耐疵付き性を測定した。With respect to the test material thus obtained, the workability and the corrosion resistance of the processed portion were evaluated in the same manner as in Example 1, and the scratch resistance was measured.
【００５２】これらの結果を表５に記載する。Table 5 shows the results.
【００５３】[0053]
【表５】 [Table 5]
【００５４】表５より、クリヤー皮膜を施したＮｏ．７
３は、クリヤー皮膜を施さないＮｏ．７４及び７５に比
べ、耐疵付き性が向上することが分かる。From Table 5, it can be seen that No. 7
No. 3 shows no clear film. It can be seen that the scratch resistance is improved as compared with 74 and 75.
【００５５】[0055]
【発明の効果】本発明の表面被覆金属板は以上の様に構
成されているので、めっき剥離防止に加え、加工部耐食
性にも優れた表面被覆金属板を効率よく提供することが
できた。As described above, the surface-coated metal sheet of the present invention is constituted as described above, so that it is possible to efficiently provide a surface-coated metal sheet which is excellent not only in the prevention of peeling of plating but also in the corrosion resistance of the processed portion.
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Claims (5)
た表面被覆金属板であって、 前記皮膜のうち、最表層皮膜はガラス転移点が５０〜１
１０℃の皮膜であり、 最表層皮膜より内側には、伸びの優れた樹脂皮膜を任意
に有することにより、加工性及び加工部耐食性が改善さ
れたものであることを特徴とする表面被覆金属板。1. A surface-coated metal plate comprising a plated metal plate having a plurality of layers formed thereon, wherein the outermost layer coating has a glass transition point of 50-1.
A surface-coated metal sheet characterized in that a workability and a corrosion resistance of a processed portion are improved by arbitrarily having a resin film having excellent elongation inside the outermost layer film at 10 ° C. .
るものである請求項１に記載の表面被覆金属板。2. The surface-coated metal sheet according to claim 1, wherein the resin film has an elongation of 10% or more.
８０℃である請求項１または２に記載の表面被覆金属
板。3. The glass transition point of the resin film is 10 to 10.
The surface-coated metal sheet according to claim 1, wherein the temperature is 80 ° C. 4.
ｍであり、最表層皮膜の膜厚は０．２〜４．０μｍであ
る請求項１〜３のいずれかに記載の表面被覆金属板。4. The resin film has a thickness of 0.2 to 4.0 μm.
m, and the thickness of the outermost layer coating is 0.2 to 4.0 µm.
とにより耐疵付き性が高められたものである請求項１〜
４のいずれかに記載の表面被覆金属板。5. The scratch resistance is improved by forming the outermost layer film as a clear film.
5. The surface-coated metal plate according to any one of 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26418699A JP2001079983A (en) | 1999-09-17 | 1999-09-17 | Surface-coated metal plate having excellent workability and corrosion resistance of worked part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26418699A JP2001079983A (en) | 1999-09-17 | 1999-09-17 | Surface-coated metal plate having excellent workability and corrosion resistance of worked part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001079983A true JP2001079983A (en) | 2001-03-27 |
Family
ID=17399680
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26418699A Pending JP2001079983A (en) | 1999-09-17 | 1999-09-17 | Surface-coated metal plate having excellent workability and corrosion resistance of worked part |
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| Country | Link |
|---|---|
| JP (1) | JP2001079983A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013022840A (en) * | 2011-07-21 | 2013-02-04 | Nippon Steel & Sumitomo Metal Corp | Clear coat steel plate having superior resistance against end face rusting |
-
1999
- 1999-09-17 JP JP26418699A patent/JP2001079983A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013022840A (en) * | 2011-07-21 | 2013-02-04 | Nippon Steel & Sumitomo Metal Corp | Clear coat steel plate having superior resistance against end face rusting |
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