US2795518A - Process for treating steel, zinc, and aluminum to increase corrosion resistance - Google Patents
Process for treating steel, zinc, and aluminum to increase corrosion resistance Download PDFInfo
- Publication number
- US2795518A US2795518A US423250A US42325054A US2795518A US 2795518 A US2795518 A US 2795518A US 423250 A US423250 A US 423250A US 42325054 A US42325054 A US 42325054A US 2795518 A US2795518 A US 2795518A
- Authority
- US
- United States
- Prior art keywords
- zinc
- acid
- solution
- aluminum
- fluorine
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 27
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052725 zinc Inorganic materials 0.000 title claims description 19
- 239000011701 zinc Substances 0.000 title claims description 19
- 229910052782 aluminium Inorganic materials 0.000 title claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 14
- 238000005260 corrosion Methods 0.000 title claims description 10
- 230000007797 corrosion Effects 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 title description 15
- 239000010959 steel Substances 0.000 title description 15
- 229910052731 fluorine Chemical group 0.000 claims description 25
- 239000011737 fluorine Chemical group 0.000 claims description 25
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Chemical group O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 20
- 229910019142 PO4 Inorganic materials 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 17
- 239000010452 phosphate Substances 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 150000002739 metals Chemical class 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910001868 water Inorganic materials 0.000 claims description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical group FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 3
- 239000000243 solution Substances 0.000 description 28
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical group C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 17
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 13
- 125000001153 fluoro group Chemical group F* 0.000 description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 150000002222 fluorine compounds Chemical class 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- -1 fluosilicic acid Chemical class 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
Definitions
- Our improved process includes two principal steps, the first being a step which employs an acidic phosphate coating solution which is designed for the production of a phosphate coating on either steel or Zinc.
- the second step involves the use of an acidulated solution of chromic acid and a fluorine bearing compound in accordance with the disclosure to follow.
- the combination of these two steps imparts excellent corrosion resistance to aluminum as well as to the steel or the zinc.
- the present invention is based upon the discovery that when steel, zinc and aluminum surfaces which have been subjected to the action of an acid aqueous phosphatizing solution of a type which will produce a crystalline phosphate coating on either steel or zinc, are subsequently es atent treatment.
- fluorine bearing compound in the foregoing statement we mean complex fluorides such as fluosilicic acid, fluoboric acid, fluozirconic'acid,-fluostannic acid, fluotitanic acid and the soluble salts of any one of them.
- the amount of chromic acid and fluorine bearing compound present in the solution is important.
- the chromic acid concentration should be between 0.30 and 10 grams per liter and preferably between 0.4 and 3.0 grams per liter.v At a chromic acid concentration of less than 0.30 gram per liter, very little enhanced corrosion resistance is obtained. At concentrations of chormic acid greater than '10 grams perliter, any crystalline phosphate coating is apt to be at least partially stripped from the metallic surface. At concentrations between 0.4 and 3.0 grams per liter of chromic acid, maximum corrosion resistance is achieved with minimum tendency of any subsequently appliedsiccative coating to blister.
- the fluorine content of the bath should be between 0.10 and 10 grams per liter, preferably between 0.1 and 1.5 grams per liter. At concentrations of less than 0.10 gram per liter, there is a marked fallingoff in the effect produced by the solution. At fluorine concentrations of greater than 10 grams per liter, there is a marked tendency to strip any phosphate coating and also to attack the surface of aluminum in a deleterious fashion. For optimum results the fluorine concentration should be between 0.1 and 1.5 grams per. liter.
- the pH of the treating solution is also important.
- the chromic acid and fluorine bearing compounds must be present in the solution in proportions and amounts so that the pH of the solution is from 1.3 to 4.0. At pHs below 1.3, there is a tendency for any phosphate coating previously formed to be stripped from the metallic surface and at a pH greater than 4.0 very little enhanced corro.
- the pH should lie between 1.8 and 3.0.
- the second treating step is effected by subjecting the surface of the metal which has already been treated with the first step to a solution of the character just described and of which typical examples are givenin Formulas 1 to 3.
- the length of treating time should be of such duration that the entire surface of the metal is thoroughly wetted with the treating solution. Once this wetting has taken place, the treated surface may then be dried and painted if desired.
- the treating solutions of this step are useful over a wide range of temperature.
- relatively low temperatures for concentrated treating solutions we prefer relatively low temperatures while for dilute treating solutions we prefer relatively high temperatures, i. e., 150 F. and over.
- relatively high temperatures i. e. 150 F. and over.
- the second treating step may be followed by a water rinse and/or a dilute acidulated rinse of any type which is conventional in this art.
- a water rinse and/or a dilute acidulated rinse of any type which is conventional in this art.
- drying of the treated and rinsed surface is usual where a siccative coating is to be subsequently applied.
- a process according to claim 11 wherein the concentration of titanium is relatively low when the concentration of chromic acid is low and relatively high when the chromic acid is high.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US423250A US2795518A (en) | 1954-04-14 | 1954-04-14 | Process for treating steel, zinc, and aluminum to increase corrosion resistance |
| DEA21730A DE1064780B (de) | 1954-04-14 | 1954-12-14 | Verfahren zur Verbesserung des Korrosionswiderstandes von Oberflaechen aus Eisen, Zink, Aluminium und deren Legierungen |
| GB5757/55A GB764385A (en) | 1954-04-14 | 1955-02-25 | Process for treating steel, zinc and aluminium to increase corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US423250A US2795518A (en) | 1954-04-14 | 1954-04-14 | Process for treating steel, zinc, and aluminum to increase corrosion resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2795518A true US2795518A (en) | 1957-06-11 |
Family
ID=23678187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US423250A Expired - Lifetime US2795518A (en) | 1954-04-14 | 1954-04-14 | Process for treating steel, zinc, and aluminum to increase corrosion resistance |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2795518A (de) |
| DE (1) | DE1064780B (de) |
| GB (1) | GB764385A (de) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3113051A (en) * | 1961-09-29 | 1963-12-03 | Purex Corp Ltd | Process and composition for producing aluminum surface conversion coatings |
| US3713902A (en) * | 1969-06-18 | 1973-01-30 | Koninklijke Hoogovens En Staal | Process for manufacturing zinc coated steel sheet, and steel sheet obtained by this process |
| US3895969A (en) * | 1971-04-26 | 1975-07-22 | J M Eltzroth And Associates In | Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing surface for synthetic resin coating compositions |
| US3895970A (en) * | 1973-06-11 | 1975-07-22 | Pennwalt Corp | Sealing rinse for phosphate coatings of metal |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148670A (en) * | 1976-04-05 | 1979-04-10 | Amchem Products, Inc. | Coating solution for metal surface |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE675334C (de) * | 1937-11-13 | 1939-05-06 | Metallgesellschaft Akt Ges | Verfahren zur Erhoehung der Haftfestigkeit von UEberzuegen auf Eisen und Stahl |
| US2276353A (en) * | 1935-09-28 | 1942-03-17 | Parker Rust Proof Co | Process of coating |
| GB632090A (en) * | 1946-03-09 | 1949-11-16 | American Chem Paint Co | Production of coatings on aluminium and its alloys |
| US2516008A (en) * | 1948-06-19 | 1950-07-18 | Westinghouse Electric Corp | Composition and process for treating metal surfaces |
| US2563430A (en) * | 1951-08-07 | Method op improving the resistance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB655079A (en) * | 1946-09-11 | 1951-07-11 | Pyrene Co Ltd | Improvements in or relating to the production of phosphate coatings |
-
1954
- 1954-04-14 US US423250A patent/US2795518A/en not_active Expired - Lifetime
- 1954-12-14 DE DEA21730A patent/DE1064780B/de active Pending
-
1955
- 1955-02-25 GB GB5757/55A patent/GB764385A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2563430A (en) * | 1951-08-07 | Method op improving the resistance | ||
| US2276353A (en) * | 1935-09-28 | 1942-03-17 | Parker Rust Proof Co | Process of coating |
| DE675334C (de) * | 1937-11-13 | 1939-05-06 | Metallgesellschaft Akt Ges | Verfahren zur Erhoehung der Haftfestigkeit von UEberzuegen auf Eisen und Stahl |
| GB632090A (en) * | 1946-03-09 | 1949-11-16 | American Chem Paint Co | Production of coatings on aluminium and its alloys |
| US2516008A (en) * | 1948-06-19 | 1950-07-18 | Westinghouse Electric Corp | Composition and process for treating metal surfaces |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3113051A (en) * | 1961-09-29 | 1963-12-03 | Purex Corp Ltd | Process and composition for producing aluminum surface conversion coatings |
| US3713902A (en) * | 1969-06-18 | 1973-01-30 | Koninklijke Hoogovens En Staal | Process for manufacturing zinc coated steel sheet, and steel sheet obtained by this process |
| US3895969A (en) * | 1971-04-26 | 1975-07-22 | J M Eltzroth And Associates In | Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing surface for synthetic resin coating compositions |
| US3895970A (en) * | 1973-06-11 | 1975-07-22 | Pennwalt Corp | Sealing rinse for phosphate coatings of metal |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1064780B (de) | 1959-09-03 |
| GB764385A (en) | 1956-12-28 |
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