【０００１】
【産業上の利用分野】
本発明は大気環境中電気防食システムに関し、特に塗装鋼材構造物の發銹、腐蝕の要因は雨水や海塩粒子と塩分をはじめとする大気環境中の付着粒子物等が吸水して形成される結露等の水分付着時であり、その付着物は電解質で、その電解質が塗膜のピンホール及び、塗装不均等部位、鋼材切断面、溶接部位、穴あけボルト固定部位等からイオン化を促進し發銹、腐蝕へと進行するが、塗装鋼材構造物に、防食電極（アノード）を設置し、その防食電極（アノード）へ電圧電流電圧電流制御機を介し、防食低電圧と防食微弱電流を通電し、前記電解質を介して防食電位（電子）の供給を行ない防食し続け、塗装輝度光沢度維持、再塗装の再發銹延長効果と、更に自掃効果のセルフクリーニングの持続効果も長期間持続し、車両塗装上付着の雨水や水滴の水玉への直射日光照射よる焼き付き現象のウォータースポットから塗装保護の特徴効果を有し、更に酸化チタンとチタン酸化物の導電性金属酸化物の防食被覆層形成の金属構造物の防食効果維持は、光照射が必要不可欠で遮光時の夜間、雨天及び、遮光部位の日陰、湿水過多環境中では腐蝕進行の不具合があり、また酸化チタンに導電性金属酸化物に酸化錫を含む導電性金属酸化物を含有した防食被覆層形成のステンレス鋼の光照射部位の防食は期待できても、その長期的遮光部位と他の金属構造物にその防食被覆形成しても、遮光時と遮光部位の防食効果は得難く、それ等の遮光部位と遮光環境の金属構造物と塗装鋼構造物の防食をし続け、更に前記導電性金属酸化物の被覆層の導電性防食効果と、大気環境中電気防食システムの特徴を併用し、防食持続をし続けることを特徴とする大気環境中電気防食システムに関するものである。
【０００２】
【従来の技術】
従来より、雨水等の水分が付着する鋼材構造物に対して、当該水分を介して微弱電流を通電する電気防食システムは公知であり、例えば特開平１１−４３７８９の広報には水分が付着する鋼構造物に水分を通じて単に微弱電流を通電する公知の電子防錆システムが開示されている。アノードの取付場所は水がかかりやすく乾きにくい場所が好ましく、更に表面が乾いているときは電流制御器から通電を中止することが開示されている。
【０００３】
特開平１１−４３７８９公報の防食電圧は８．５〜１２Ｖ表示出力で、実質装着時出力は８．５〜１０Ｖ前後と電流制御器出力は不均一で、近年の外部電源法の理論より遙かに低く、構造物の形状や腐蝕環境と大気環境状態の塩水環境、海塩粒子付着及び、完全濡れ環境や、その結露時に応じた電圧電流の変換性もなく、装着アノードへの通電電流も制御器からの出力が、同時出力４アノード以上の構成で、１出力が２８０〜３２０ｍＡで一定面積に１．０００ｍＡ超えると過防食が起こることが懸念される問題もあった。
【０００４】
【発明が解決しようとする課題】
従来の電子防錆システムでは穴あけによりアノード装着を行なっていたが、穴あけ鋼板部位のアノード固定ビスの隙間より雨水、塩水進入によりアノード固定ビス鋼板穴あけ部位とアノードのＬＥＤ点滅ランプのアース線とアノードと鋼板設置面に腐蝕が発生して防食効果が得られず、穴あけ作業も厚鋼板等は労力を要するものであった。また、二重構造部の穴あけ作業近傍の油圧配管や電気配線等を破損する危険性の問題もあった。更に寒冷地や寒暖差地域に於て、穴あけ不可能な構造物やタンク、パイプライン等は貼付け接着取付の接着テープの劣化が生じ、アノード脱落で防食効果が得られない問題があった。
【０００５】
また、アノード材質は主にアルミアノードであっために、腐蝕の厳しい海水環境下では防食効果が得られず、アノード材質及び、防食電圧電流出力も、その防食対象物や腐蝕環境に応じて適選選択することや尚且つ、アノード形状と防食対象物の材質や取付け部位と形状に合ったもので、腐蝕環境と大気環境に応じたものを使用する必要があり、更にアノード配線と延長配線及び、電流制御部配線とアノード配線腐蝕や耐候性、耐熱性の問題も未解決であった。
【０００６】
ｎ型半導体の酸化チタンに光を照射をすると、アノード電流の増大化がみられ、それに伴って防食電位の卑下が発生し、更にその表面上でのアノード反応は水分や結露等の水分酸化であり、酸化チタンそのものの溶解や劣化は起こらない。この防食を利用する酸化チタン被覆層形成だけでは、防食の実用化を成しえる防食効果は得がたい。それは酸化チタン被覆層を形成した防食効果を持続的に得るには、必ず光照射が必要不可欠であることから、酸化チタンの被覆層形成で、その防食効果を利用しようとしても、遮光時の夜間や雨天及び、遮光部位の日陰、湿水過多環境や塩水環境中では腐蝕が進行する不具合がある。
【０００７】
特開平１１−７１６８４公報では、金属材料表面の下層にＦｅ，Ｖ及びＣｕとからなる群から選出されて、１種の金属元素をチタン酸化物被覆中に５〜２０％の混合含有する第１の被覆層を形成し、更にその上にチタンの酸化物を含有する第２の被覆層を形成する技術が広報されており、光が遮断されてもカソード防食効果が持続して、高い防食を得ることが開示されている。
【０００８】
最近、前記防食不具合の改善を行なう考察研究で、金属材料に酸化チタンと導電性酸化物の防食被覆形成の焼成温度は２００℃以下で、酸化チタンに酸化錫を含む導電性金属酸化物を含有した防食被覆層を形成し、その金属に防食効果が発生し、その防食効果は遮光後において数時間の間は、ステンレス３０４鋼で電位が−５００ｍＶ持続した結果を得たとの研究報告がされている。
【０００９】
特開平１１−７１６８４広報の防食被覆形成は、金属材料の上に２層以上の被覆層形成は被覆層形成が多工程で、金属材料上に被覆層形成する焼成温度が高温で、大型構造物等への現場でのその被覆層形成は実用的には不向きで難があり尚、酸化チタンと導電性金属酸化物に酸化錫を含む導電性金属酸化物を含有した防食被覆層形成の防食効果の採用は、ステンレス３０４鋼の防食電位−４００ｍＶの防食維持効果は可能であろうが、長時間の遮光時や遮光部位の日陰、湿水過多環境や塩水環境中では腐蝕の進行が発生し、且つ、その防食被覆層形成は鉄の防食電位−７５０ｍＶ以下の防食電位の保持は望めない。
【００１０】
【課題を解決するための手段】
本発明の大気環境中電気防食システムは、塗装鋼構造物に対して電圧電流制御機を介して低電圧と微弱電流を通電する防食電極と、塗装鋼構造物に接続されたアースとからなる大気環境中電気防食システムに於て、大気環境中の塗装錆構造物の發銹、腐蝕要因は雨水や海塩粒子付着や塩分をはじめとする大気中付着物粒子等が吸水して形成される結露時や水分付着時であり、その吸水付着物や結露等は電解質で、その電解質が塗膜のピンホール及び、塗装不均等部位、鋼材切断面、溶接部位、穴開けボルト固定部位等からイオン化促進し、發銹、腐蝕へと進行するが、塗装鋼材構造物に電圧電流制御機を介し、電極（アノード）を設置し低電圧と微弱電流を通電し、塗装鋼材構造物の付着の電解質を介して防食電位（電子）の供給を行ない防食しつづけ、更に塗装劣化と塗装輝度光沢維持、再塗装の再發銹時期の延長効果、また塗装付着物や汚れの自掃効果（セルフクリーニング）の持続効果及び、車両塗装上付着の水滴の水玉による直射日光によるレンズ作用の焼き付き現象のウォータースポットから塗装保護効果を有することを特徴し、塗装鋼構造物の大気環境状態や電解質と海塩粒子付着状況及び、海水環境等の状況に応じて、電圧電流制御機の出力は選択設定と自動可変式に通電される防食電圧（０．５〜１５Ｖ）の直流低電圧と防食微弱電流流（０．１〜３２０ｍＡ）を防食電極（アノード）へパルス式に通電制御を可能としたことを特徴とし、且つ、防食電極（アノード）は、取付部位に応じた形状を適選し、腐蝕環境と防食対象物の材質に応じて、溶解性や不溶解を適選し、スタッド溶接機にて塗装鋼構造物に溶接したステンレス製スタッドボルトを絶縁して、装着し設置したことを特徴とする請求項１記載の大気環境中電気防食システムを提供するものである。
【００１１】
本発明の大気環境中電気防食システムは、酸化チタンとチタン酸化物の導電性金属酸化物の防食被覆層を形成した金属構造物の防食効果を持続的に得るには、必ず光照射が必要不可欠であり、遮光時の夜間や雨天及び、遮光部位の日陰、湿水過多環境や塩水濡れ環境中では腐蝕が進行する不具合があり、その不具合部位の遮光時と遮光部位は腐蝕進行する。その腐蝕進行する不具合な金属構造物部位に、電圧電流制御機を介して防食電極（アノード）へ防食低電圧と防食微弱電流を通電し、防食をし続ける、請求項１、請求項２ないし３の装着を設置したことを特徴とし、更に前記導電性金属酸化物の防食被覆層の導電性の防食効果と、本発明の大気環境中電気防食システムの併用は、更なる防食持続効果維持に大きな期待が持てる、請求項１、請求項２ないし３記載の大気環境中電気防食システムを提供するものである。
【００１２】
酸化チタンに酸化錫を含む導電性金属酸化物を含有した防食被覆層を形成した金属構造物の防食効果の考察研究で、金属材料にその防食被覆層形成の焼成温度は２００℃以下で、酸化チタンに酸化錫を含む導電性金属酸化物を含有した防食被覆層形成された金属材料に於て、防食効果が発生した研究報告の、その防食効果は遮光後において数時間の間はステンレス３０４鋼で電位が−５００ｍＶ持続した結果を得た研究報告がされている。しかし、長時間の遮光や遮光部位の日陰、湿水過多環境や塩水環境中では腐蝕の進行の防食持続の不具合が懸念され、尚、鉄の防食電位−７５０ｍＶ以下の防食電位の保持は望めない。その防食対象物の不具合部位に電圧電流制御機を介して防食低電圧と防食微弱電流を通電し、防食し続ける請求項１、請求項２ないし３の装着設置したことを特徴とし、更に前記導電性金属酸化物の防食被覆層の導電性の防食効果と、本発明の大気環境中電気防食システムの併用は更なる防食持続効果維持に大きな期待が持てる、請求項１、請求項２ないし３記載の大気環境中電気防食システムを提供するものである。
【００１３】
【発明の実施の形態】
以下、図面に基づき本発明の大気環境中電気防食システムの実施形態を詳細に説明する。
【００１４】
図面に於て、図１は本発明の大気環境中電気防食システムの実施形態を示す構成図であり、１は交流電流、もしくはソーラー、バッテリー、２はアース、３は電圧電流制御機、４は防食電極（アノード）出力線、５は防食電極（アノード）６は絶縁材、７はスタッドボルト、８は雨水又は結露、９は塩分粒子、１０は防食電極（アノード）配線、１１は鋼材構造物、１２は防食電圧電流、１３はヒューズ、１４は埋込型電極入力端子を表わしている。
【００１５】
交流電流１は電圧電流制御機３を介して防食電極（アノード）配線４によって埋込型電極入力端子１４で防食電極（アノード）５へ通電される。また、他の複数の防食電極（アノード）へも防食電極（アノード）配線１０によって通電される。図１に示すように防食電極（アノード）５は埋込型電極入力端子付の防食電極（アノード）であって、防食対象構造物１１に固定され、防食電圧電流１２が通電される。
【００１６】
大気環境状態及び、塩水環境、結露時や腐蝕構造物材質に応じて、電圧電流制御機３の出力を選択選定し、パルス式に通電される防食電圧は０．５〜１５Ｖの直流低電圧と防食電流０．０１〜３２０ｍＡの微弱電流が防食電極（アノード）を介して鋼材構造物１１に制御通電される構成で、鋼材構造物１１にはアース２が接続されている。
【００１７】
この結果、鋼材構造物１１の表面の雨水又は結露８や海塩粒子９の付着物は鋼材構造物１１の發銹、腐蝕要因物質の電解質であり、その電解質８や９を介して鋼材構造物１１に防食電極（アノード）５を介し、防食電圧電流１２が通電され、鋼材構造物１１に不動態電位卑下の電子が補給されて鋼材構造物金属のイオン化が防止されて防食効果を持続する。本発明の大気環境中電気防食システムで多くの發銹抑制持続効果と鋼板腐蝕の防食効果に種々、数多くの知見を得ている。
【００１８】
鋼材構造物の１１に取り付けるアース２は鋼材構造物１１の構造や發銹、腐蝕環境及び、材質と構造上のアース状況（電子通電性）を考慮し、防食電流（電子）が広範囲に且つ、定量的に通電され、防食電位回路（電子通電回路）を効率的に作り出すために複数のアースを効率的に設け、そのアースの役割について以下に述べる通りである。
【００１９】
電気は＋から−へ流れるが、鋼構造物及び金属構造物の防食電位（電子）の流れは、電気とは反対方向の流れであり、この電子の基本原理原則からもアースは適所に適数を設置し、鋼構造物及び金属構造物の不動態電位卑下の防食電子回路を確実に確保することが不可欠である。
【００２０】
電圧電流制御機３からの防食電圧出力は過防食懸念環境や部位では０．５〜１０Ｖを選択設定し尚、複数の防食電極（アノード）取付時同時出力は、３個の電極（アノード）数以内の９９０ｍＡ以下に制御出力で一定防食面積の過防食を抑制し、大気環境状態に応じた通電出力は、０．５〜１５Ｖ直流低電圧で防食電流は０．０１〜３２０ｍＡの微弱電流をパルス式に出力し、前期構造物に防食電圧電流を通電可能としたことを特徴とし、安全性も高く設定されているが、更に万一高電圧流出時には安全性確保と電流制御機３の保護を目的として入力電源側にヒューズ１３が設置されている。また、埋込型入力端子付１４の端子部位と防食電極（アノード）５を挿入するスタッドボルト７は収縮チューブとシリコン等の絶縁材で被覆されて完全に絶縁されている。
【００２１】
通電実施テスト結果は以下の通りである。
電圧電流制御機３を介し防食電極（アノード）５から鋼材構造物１１に防食電極（アノード）と、アース２を鋼材構造物１１に設置接続し、海水環境の全面濡れ状態で防食電極（アノード）５へ電圧出力をパルス式に通電し、その防食電極（アノード）へ通電電圧測定を行なった結果、その電圧出力は０．５〜１０Ｖ以内で尚、同環境の濡れ状態から、更に湿り状態へ、そして乾燥状態時での防食電極（アノード）５への電圧出力は１０〜１５Ｖへと変化し、塩水分付着量や濡れ状態の変化にともなって防食電極（アノード）５への電圧出力は自動変換された制御通電が確認された。この防食電圧は、相対湿度が高く海塩粒子付着量も多い環境、相対湿度が高く海塩粒子量が少ない環境、相対湿度が低く海塩粒子付着量の多い環境の發銹や腐蝕環境状況に応じて、防食電圧０．５〜１５Ｖと、防食微弱電流０．０１〜３２０ｍＡの制御通電が確認された。この防食電流は腐植挙動を抑制、防止する理論、文献上の数値の約１μＡの制御通電を可能とし且つ、以下の相対湿度と海塩粒子付着量及び、水分や塩分をはじめとする、大気環境中付着物粒子等が吸水し形成される電解質や結露時の、その電解質のイオン化によって鋼材構造物は發銹、腐蝕進行するが、本発明の大気環境中電気防食システムは發銹や腐蝕進行させる電解質に、大きく依存し防食電圧電流（防食電子）を制御通電し、發銹、腐蝕の防食機能を果たし続けることが容易に確認できたことを表わしていることを確認することができた。
【００２２】
【実施例】
次に、本発明の大気環境中電気防食システムを灯油タンクに応用した、実施例について説明する。
【００２３】
図２は本発明の大気環境中電気防食システムを灯油タンク２０に装着した実施形態を示す構成図であり、図２中１は交流電流、２はアース、３は電圧電流制御機、４は電極用配線、１５１乃至１５３は角形電極、１６１乃至１６５は板型電極、１７は防護柵、１８１乃至１８２は丸形電極、１９はパイプライン、２０はタンク、２１はタンク支持部を表わしている。
【００２４】
交流電流１は電圧電流制御機３を介して電極用配線４によってタンク２０に設置された角形電極１５１，１５２，１５３、板型電極１６１，１６２，１６３，１６４，１６５、丸形電極１８１，１８２，に配線され、防食電圧電流１２が通電される。また、タンク２０へのパイプラインにも板型電極１６３，１６４，が設置され、防食電圧電流１２が通電される。更に防護柵１７にも板型電極１６５，が設置され、防食電圧電流１２が制御通電される。各電極はスタッドボルト７によって保持され脱落することはない。
【００２５】
支持部２１によって支持固定されているタンク２０に取り付けるアースは、図示するようにタンク２０の構造形態や發銹、腐蝕状況及び、腐蝕環境によって、防食電流（電子）が広範囲に定量的に制御通電し易くし、防食電位回路（電子回路）を効率的に作り出すためにタンク全体構造上からタンク支持部、パイプライン及び、梯子等へ複数のアースが効率的に設けられている。
【００２６】
電圧電流制御機３を介し通電する防食電圧電流は、過防食環境では（０．５〜１０Ｖ）に選択選定し、大気環境状態に応じて自動可変式の制御通電は、パルス式に通電し、電圧出力は（０．５〜１５Ｖ）の直流低電圧と（０．０１〜３２０ｍＡ）の微弱電流を防食電極（アノード）を介して、鋼構造物１１の表面全体に制御通電を可能に構成され、鋼構造物にはアース２が接続されている。
【００２７】
タンク２０の表面上に付着した、雨滴又は結露８や海塩粒子９等の付着物は電解質であり、その電解質を介してタンク２０に防食電圧と防食電流１２が制御通電され、タンク２０の表面に防食電位（電子）が補給されてタンク２０の鋼材構造物金属のイオン化が防止され防食持続効果が得られる。
【００２８】
更に、本発明者等は本発明の防食システムを前記灯油タンクの、再塗装３ヶ月後設置し、發銹防食持続効果追跡を５年間行なった。その設置環境は、豪雪地帯で冬期１１月後半から４月末の間のタンクには２ｍを越す積雪で、問題視される酸性雨と酸性雪のため塗装塗り替えを５年周期のサイクル対応したいが、３年半で發銹し４年目にはタンク全体が赤錆に覆われ外見上も酷く４年周期の再塗装を余儀なくされていた。装着後５年目時点に於ても、タンク全体、防護柵、梯子、タンク支持部、パイプラインの何れにも發銹の痕跡はなく、再塗装直後同様に塗装に変化は無く、防食電極（アノード）をスタッド溶接機でステンレス製ボルトに固定した防食電極（アノード）は、何れの形状の物も５年経過以後も脱落はなく、配線の断線、腐蝕も同様に無かった。その發銹防止効果は再塗装でも完全に防止され６年経過時点でも、全く發銹は見られなかった。その時点で１．５倍以上の期間、酸性雨と酸性雪の發銹要因の電解質を介して防食電圧電流は制御通電され發銹の防止をし続ける知見を得、その他の防食効果に於ても、塩水環境、亜硫酸系ガス、塩化カルシユム、塩害（岩塩）、鶏糞、牧場糞尿、海塩粒子付着の環境の發銹、腐蝕、鋼板腐蝕穴あき等の種々の發銹、腐蝕防食を多々知見し、その効果は１．５〜３倍の防食持続効果を知見し、塗装鋼構造物の發銹、腐蝕要因は相対湿度や海塩粒子付着量及び、水分や塩分をはじめとする大気環境中付着物粒子等の、吸水保湿作用で形成れる結露時等の電解質のイオン化によって發銹、腐蝕進行する。その防食対照物へ、防食電圧電流制御機から防食電極を介しその電解質へ通電し、防食対象物へアースが接続され防食電位回路（電子回路）が確保されて効率的に細部に、広範囲に定量的に制御通電され防食を持続し続ける、種々、数々の防食効果実績の知見を得ることができた。尚且つ、本発明の防食システムは、酸化チタンとチタン酸化物及び、酸化チタンに酸化錫を含む導電性金属酸化物の含有の防食被覆層を形成した金属構造物の遮光時、遮光部位の防食持続効果不具合部位の防食をし続け、導電性金属酸化物被覆層形成の防食効果と大気環境中電気防食システムが持つ防食特性との併用は、更なる腐蝕防食効果に大きな期待が持てる。
【００２９】
【発明の効果】
本発明の大気環境中電気防食システムについては以上説明した構成と実施例と実施テストによって明らかなように、効率的で防食効果の持続性に優れ、従来のアノード脱落の問題及び、配線の耐蝕性、耐候性、耐熱性等の問題を解決し、防食電圧電流は実施テストに示したように、相対湿度が高く海塩粒子付着量が多い環境、相対湿度が高く海塩粒子付着量が少ない環境、相対湿度が低く海塩粒子付着量が多い環境でも、防食電圧電流はその環境の湿度や海水環境の完全濡れ状態から乾燥過程の状況に応じて、防食に必要な防食電圧電流を自動可変制御でパルス式に通電の構成とし、尚、海水環境の常時濡れ環境での過防食回避に電圧出力を選択設定を可能とし、その防食効果は腐蝕の厳しい塩水濡れ環境や海塩粒子付着環境及び、塩化カルシュム、亜硫酸ガス、化学肥料、鶏糞、牧場糞尿処理等の厳しい腐蝕環境の發銹、腐蝕と鋼板穴あき等の種々、数々の腐蝕防食効果を知見し、塗装劣化の抑制効果の塗装輝度維持保護効果や再塗装後の發銹時期を従来の１．５倍以上の防銹実績等、その証は前記説明の灯油タンク実施例に示し更に、塗装付着の水滴への直射日光による焼き付き現象のウォータースポット防止効果の塗装保護効果を有するこれ等の塗装保護効果と腐蝕防食効果は、腐植挙動を抑制防止する文献や理論の、防食電流は約１μＡとする確立化が、これらの腐蝕防食効果から得られた。更に、本発明の大気環境中電気防食システムは酸化チタンとチタン酸化物及び、酸化チタンに酸化錫を含む導電性金属酸化物含有の防食被覆層形成の金属構造物の、防食不具合の遮光時、遮光部位と防食不具合環境での防食持続効果と、前記導電性金属酸化物の防食被覆層の導電性防食効果と大気環境中電気防食システムの電気防食特性の併用は、更なる腐蝕防食持続効果に大きな期待が持て、塗装鋼構造物の發銹、腐蝕の防食をし続け、塗装保護効果を有し、安全で、エコ的で効率的な大気環境中電気防食システムを提供をすることができた。
【図面の簡単な説明】
【図１】本発明の大気環境中電気防食システムの一実施形態を示す図である。
【図２】本発明の大気環境中電気防食システムを灯油タンクに装着した実施形態を示す構成図である。
【符号の説明】
１．交流電流
２．アース
３．電圧電流制御部
４．電極用配線
５．電極アノード
６．絶縁材
７．スッタドボルト
８．雨水又は結露
９．海塩粒子
１０．電極アノード配線
１１．鋼材構造物
１２．防食電圧電流
１３．ヒューズ
１４．埋込型入力端子付電極
１５１．角形電極
１５２．角形電極
１５３．角形電極
１６１．板型電極
１６２．板型電極
１６３．板型電極
１６４ 板型電極
１６５．板型電極
１７．防護柵
１８１．丸形電極
１８２．丸形電極
１９．パイプライン
２０．タンク
２１．タンク支持部[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to an anticorrosion system in the air environment, and in particular, causes of rusting and corrosion of painted steel structures are formed by rainwater, sea salt particles and attached particles in the air environment including salt, etc. When moisture such as dew is attached, the deposit is an electrolyte, which promotes ionization from pinholes in the coating film, uneven coating areas, steel cut surfaces, welded areas, drilled bolt fixing areas, etc. Although it progresses to corrosion, an anticorrosion electrode (anode) is installed on the coated steel structure, and an anticorrosion low voltage and anticorrosion weak current are applied to the anticorrosion electrode (anode) via a voltage / current / current controller. The anticorrosion potential (electrons) is supplied through the electrolyte to continue anticorrosion, maintain the coating brightness and glossiness, extend the re-rusting effect of re-painting, and also maintain the self-cleaning effect of the self-cleaning effect for a long time, Rain on vehicle paint Effect of paint protection from water spots caused by the burning of water droplets and water droplets on the polka dots by direct sunlight irradiation, and the anticorrosive effect of metal structures formed by the formation of an anticorrosion coating layer of titanium oxide and a conductive metal oxide of titanium oxide Maintaining light is indispensable, there is a problem of corrosion progress in the night at the time of shading, in rainy weather, in the shade of the shading area, in an environment with excessive moisture, and in the conductive metal oxide containing titanium oxide containing tin oxide The anti-corrosion of the light-irradiated part of stainless steel with anti-corrosion coating layer containing conductive metal oxide can be expected, but even if the anti-corrosion coating is formed on the long-term light-shielding part and other metal structures, the light-shielding and light-shielding It is difficult to obtain the anti-corrosion effect of the parts, so that the light-shielding parts and the metal structures and the coated steel structures in the light-shielding environment continue to be corroded, and the conductive anti-corrosion effect of the coating layer of the conductive metal oxide and the air environment Medium cathodic protection system A combination of features, it relates to cathodic protection systems atmospheric environment characterized by continuing the anticorrosion sustained.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known an anticorrosion system in which a weak current is applied to a steel structure to which moisture such as rainwater adheres via the moisture. There is disclosed a known electronic rust prevention system in which a weak current is simply passed through a structure through moisture. It is disclosed that the mounting location of the anode is preferably a location that is easy to be exposed to water and hardly dries, and furthermore, when the surface is dry, the current controller stops the energization.
[0003]
In JP-A-11-43789, the anticorrosion voltage is a display output of 8.5 to 12 V, and the output at the time of substantial mounting is about 8.5 to 10 V, and the output of the current controller is non-uniform, far from the theory of the recent external power supply method. Low, the shape of the structure, the corrosive environment and the salt water environment in the atmospheric environment, the adhesion of sea salt particles, the completely wet environment, and the conversion of the voltage and current according to the dew condensation. There is also a problem that if the output from the vessel has a simultaneous output of 4 anodes or more, and if one output is 280 to 320 mA and exceeds a predetermined area of 1.000 mA, excessive corrosion may occur.
[0004]
[Problems to be solved by the invention]
In the conventional electronic rust prevention system, the anode was installed by drilling.However, rainwater and salt water entered through the gap of the anode fixing screw at the drilled steel plate part, and the anode wire of the anode fixing screw steel plate drilled and the ground wire and anode of the LED flashing lamp on the anode. Corrosion occurred on the steel plate installation surface, and the anticorrosion effect was not obtained, and drilling work also required labor for thick steel plates and the like. In addition, there is also a problem that the hydraulic piping, electric wiring, and the like near the drilling work of the double structure may be damaged. Further, in a cold region or in a region with a difference in temperature, there is a problem that an adhesive tape attached to a non-drillable structure, a tank, a pipeline, or the like is stuck and attached, so that an anti-corrosion effect cannot be obtained due to falling off of the anode.
[0005]
In addition, since the anode material was mainly an aluminum anode, the anticorrosion effect was not obtained in a severely corroded seawater environment, and the anode material and the anticorrosion voltage / current output were appropriately selected according to the anticorrosion target and the corrosive environment. It is necessary to use one that matches the anode shape, the material of the anticorrosion target and the mounting site and shape, and that is suitable for the corrosive environment and the air environment. The problems of corrosion, weather resistance, and heat resistance of the current control unit wiring and the anode wiring have not been solved.
[0006]
When light is applied to titanium oxide of an n-type semiconductor, an increase in the anode current is observed, which causes a decrease in the anticorrosion potential, and the anodic reaction on the surface is caused by moisture oxidation such as moisture and dew condensation. There is no dissolution or deterioration of titanium oxide itself. It is difficult to obtain the anticorrosion effect that can achieve practical application of anticorrosion only by forming the titanium oxide coating layer using this anticorrosion. In order to obtain the anti-corrosion effect of forming a titanium oxide coating layer, light irradiation is indispensable in order to obtain a sustained effect. There is a problem that corrosion progresses in rainy weather, in the shade of a light-shielded portion, in an environment with excessive moisture, or in an environment of salt water.
[0007]
In JP-A-11-71684, a first metal element selected from the group consisting of Fe, V, and Cu in a lower layer of a metal material surface and containing 5 to 20% of one metal element in a titanium oxide coating is included. A technique of forming a coating layer of, and further forming a second coating layer containing a titanium oxide thereon has been widely publicized, and even if light is blocked, the cathodic protection effect is maintained and high corrosion protection is provided. It is disclosed to obtain.
[0008]
Recently, in a study to improve the corrosion prevention problem, a baking temperature for forming a corrosion protection coating of titanium oxide and a conductive oxide on a metal material was 200 ° C. or less, and a conductive metal oxide containing tin oxide was contained in titanium oxide. It has been reported that a corrosion inhibitory effect was formed on the metal by forming an anticorrosive coating layer, and that the anticorrosive effect was obtained by maintaining the potential of -500 mV in stainless steel 304 for several hours after shading. I have.
[0009]
Japanese Patent Application Laid-Open No. H11-71684 discloses the formation of an anticorrosion coating. The formation of two or more coating layers on a metal material is a multi-step process in which the coating layer is formed. The formation of such a coating layer in the field, etc. is not suitable for practical use and is difficult. In addition, the anticorrosion effect of the formation of an anticorrosion coating layer containing a conductive metal oxide containing tin oxide in titanium oxide and a conductive metal oxide Although the adoption of the anti-corrosion potential of stainless steel 304 steel may be capable of maintaining the anti-corrosion potential of -400 mV, the progress of corrosion occurs during long periods of shading or shading of the shading site, in an excessively wet environment or in a salt water environment, In addition, the formation of the anticorrosion coating layer cannot expect to maintain the anticorrosion potential of -750 mV or less of iron.
[0010]
[Means for Solving the Problems]
The atmospheric anti-corrosion system of the present invention comprises an anti-corrosion electrode for supplying a low voltage and a weak current to a coated steel structure via a voltage / current controller, and an atmosphere including an earth connected to the coated steel structure. In an environmental cathodic protection system, the rusting and corrosion of painted rust structures in the atmospheric environment is caused by condensation of rainwater, sea salt particles, and particles adhering to the atmosphere, such as salts. When water is adhering, the water-absorbing substances and dew are electrolytes, and the electrolyte accelerates ionization from pinholes in the coating film, uneven coating areas, steel cut surfaces, welded areas, drilled bolt fixing areas, etc. Although it progresses to rusting and corrosion, the electrode (anode) is installed on the coated steel structure via a voltage / current controller, a low voltage and a weak current are applied, and the electrolyte adheres to the coated steel structure. Supply of anti-corrosion potential (electrons) In addition, furthermore, the deterioration of the paint and the maintenance of the brightness and luster of the paint, the effect of extending the re-rusting time of repainting, the effect of self-cleaning of paint deposits and dirt (self-cleaning), and the polka dots of water droplets adhering to vehicle paint It is characterized by having a coating protection effect from the water spot of the seizure phenomenon of the lens action due to direct sunlight, depending on the atmospheric environment state of the coated steel structure, the state of adhesion of electrolyte and sea salt particles, and the state of seawater environment, etc. The output of the voltage / current controller is selectively set and pulsed with a direct current low voltage of anticorrosion voltage (0.5 to 15 V) and a weak current flow of anticorrosion (0.1 to 320 mA) applied to the anticorrosion electrode (anode) in an automatically variable manner. It is characterized by the fact that the energization can be controlled in a formula, and the shape of the anticorrosion electrode (anode) is appropriately selected according to the mounting site, and it is soluble or insoluble depending on the corrosion environment and the material of the anticorrosion target To The stainless steel stud bolt selected and welded to a painted steel structure by a stud welding machine is insulated, installed, and installed, and the system for providing an anticorrosion system in the atmospheric environment according to claim 1 is provided. .
[0011]
In the atmospheric anticorrosion system of the present invention, light irradiation is indispensable in order to continuously obtain the anticorrosion effect of the metal structure formed with the anticorrosion coating layer of the conductive metal oxide of titanium oxide and titanium oxide. At the time of shading, there is a problem that corrosion progresses in the nighttime, in rainy weather, in the shade of a light-shielding portion, in an environment of excessively wet water, or in a salt-wet environment. 4. An anticorrosion electrode (anode) is supplied with a low anticorrosion voltage and a low anticorrosion current through a voltage / current controller to a portion of the metal structure where the corrosion progresses, thereby continuing the anticorrosion. In addition, the combination of the conductive anticorrosion effect of the anticorrosion coating layer of the conductive metal oxide and the anticorrosion system in the atmospheric environment of the present invention is great for maintaining a further anticorrosion sustaining effect. It is an object of the present invention to provide an anticorrosion system in an atmospheric environment according to claims 1, 2 and 3, which can be expected.
[0012]
A study of the anticorrosion effect of a metal structure having a corrosion-resistant coating layer containing a conductive metal oxide containing tin oxide on titanium oxide. The baking temperature for forming the corrosion-resistant coating layer on a metal material is 200 ° C. or less. In a research report that a corrosion protection effect occurred in a metal material formed with a corrosion protection coating layer containing a conductive metal oxide containing tin oxide in titanium, the corrosion protection effect was as high as that of stainless steel 304 stainless steel for several hours after shading. Research reports have shown that the potential was maintained at -500 mV. However, there is a concern that shading of the light-shielding portion for a long time, shading of the light-shielded portion, corrosion prevention of corrosion progress in a humid water environment or a salt water environment, and a corrosion protection potential of iron of -750 mV or less cannot be maintained. . 4. An anticorrosion low voltage and an anticorrosion weak current are applied to a defective portion of the anticorrosion object through a voltage / current controller to continue the anticorrosion, and the conductive material is further installed. The combination of the conductive anticorrosion effect of the anticorrosion coating layer of a conductive metal oxide and the anticorrosion system in the atmospheric environment of the present invention has a great expectation for further maintaining the anticorrosion effect. The present invention provides an anticorrosion system in an atmospheric environment.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an atmospheric anticorrosion system according to the present invention will be described in detail with reference to the drawings.
[0014]
In the drawings, FIG. 1 is a configuration diagram showing an embodiment of the atmospheric anticorrosion system of the present invention, wherein 1 is an alternating current or a solar battery, 2 is ground, 3 is a voltage / current controller, and 4 is Corrosion prevention electrode (anode) output line, 5 is corrosion prevention electrode (anode) 6, insulating material, 7 is stud bolt, 8 is rainwater or dew condensation, 9 is salt particles, 10 is anticorrosion electrode (anode) wiring, 11 is steel structure , 12 are anticorrosion voltage / current, 13 is a fuse, and 14 is a buried electrode input terminal.
[0015]
The alternating current 1 is supplied to the anticorrosion electrode (anode) 5 at the embedded electrode input terminal 14 by the anticorrosion electrode (anode) wiring 4 via the voltage / current controller 3. Further, electricity is also supplied to the other plurality of anticorrosion electrodes (anodes) by the anticorrosion electrode (anode) wiring 10. As shown in FIG. 1, an anticorrosion electrode (anode) 5 is an anticorrosion electrode (anode) with an embedded electrode input terminal, and is fixed to an anticorrosion target structure 11, and an anticorrosion voltage / current 12 is supplied.
[0016]
The output of the voltage / current controller 3 is selected and selected according to the atmospheric environment condition, salt water environment, dew condensation, and the material of the corroded structure, and the anticorrosion voltage applied in a pulsed manner is a DC low voltage of 0.5 to 15 V. A weak current of 0.01 to 320 mA of anticorrosion current is controlled and supplied to the steel structure 11 via an anticorrosion electrode (anode), and the steel structure 11 is connected to an earth 2.
[0017]
As a result, the rainwater or dew 8 or the deposit of sea salt particles 9 on the surface of the steel structure 11 is an electrolyte of a substance which causes rust and corrosion of the steel structure 11, and the steel structure via the electrolytes 8 and 9. An anticorrosion voltage / current 12 is passed through the anticorrosion electrode (anode) 5 through the anticorrosion electrode (anode) 5, and electrons having a passive potential lower are supplied to the steel structure 11, thereby preventing metal ionization of the steel structure metal and maintaining the anticorrosion effect. The electrolytic corrosion protection system in the atmospheric environment of the present invention has obtained many knowledges on various effects of sustaining rust suppression and preventing corrosion of steel sheet.
[0018]
The earth 2 attached to the steel structure 11 has a wide range of anticorrosion current (electrons) in consideration of the structure of the steel structure 11, rust and corrosion environment, and the material and structure of the earth (electron conductivity). A plurality of grounds are provided efficiently in order to create a corrosion prevention potential circuit (electron current supply circuit) efficiently, and the role of the grounds is as described below.
[0019]
Although electricity flows from + to-, the flow of anticorrosion potential (electrons) in steel structures and metal structures is a flow in the opposite direction to that of electricity. It is indispensable to set up and securely secure the corrosion-prevention electronic circuit under the passive potential of the steel structure and the metal structure.
[0020]
The anticorrosion voltage output from the voltage / current controller 3 is selected and set to 0.5 to 10 V in an environment or a place where the anticorrosion is concerned. When a plurality of anticorrosion electrodes (anodes) are attached, the simultaneous output is the number of three electrodes (anodes) Within 990 mA or less, the control output suppresses over-corrosion protection of a constant anti-corrosion area, the energization output according to the atmospheric environment state is 0.5-15 V DC low voltage, and the anti-corrosion current pulse weak current of 0.01-320 mA It is characterized by the fact that it is possible to pass the anticorrosion voltage and current to the structure in the previous period and the safety is set high, but in the event of a high voltage outflow, the safety and the protection of the current controller 3 are further secured. A fuse 13 is provided on the input power supply side for the purpose. The terminal portion of the embedded input terminal 14 and the stud bolt 7 for inserting the anticorrosion electrode (anode) 5 are completely insulated by being covered with an insulating material such as silicon and a shrinkable tube.
[0021]
The results of the energization test are as follows.
An anticorrosion electrode (anode) and an earth 2 are connected to the steel structure 11 from the anticorrosion electrode (anode) 5 to the steel structure 11 via the voltage / current controller 3, and the anticorrosion electrode (anode) is wet in the seawater environment. 5, the voltage output was applied to the anticorrosion electrode (anode), and the voltage output was within 0.5 to 10 V. From the wet state of the same environment, it changed to a wet state. In addition, the voltage output to the anticorrosion electrode (anode) 5 in the dry state changes to 10 to 15 V, and the voltage output to the anticorrosion electrode (anode) 5 automatically changes according to the change in the amount of attached salt water and the wet state. The converted control energization was confirmed. This anticorrosion voltage can be used in environments with high relative humidity and large amounts of sea salt particles attached, environments with high relative humidity and small amounts of sea salt particles, and environments with low relative humidity and large amounts of sea salt particles attached to rusting and corrosive environments. Accordingly, control energization of the anticorrosion voltage of 0.5 to 15 V and the anticorrosion weak current of 0.01 to 320 mA was confirmed. This anticorrosion current is a theory that suppresses and prevents humus behavior, enables control energization of about 1 μA, which is a numerical value in the literature, and has the following relative humidity, sea salt particle adhesion amount, and atmospheric environment including water and salt content. The electrolyte formed by absorbing and adhering particles and the like during the dew condensation and the ionization of the electrolyte during dew condensation cause the steel structure to rust and corrode. However, the anticorrosion system in the atmospheric environment of the present invention causes the rust and corrosion to progress. It was confirmed that it was easily confirmed that the anti-corrosion voltage / current (anti-corrosion electron) was controlled and energized greatly depending on the electrolyte, and that the anti-corrosion function of rust and corrosion could be easily maintained.
[0022]
【Example】
Next, an example in which the atmospheric anticorrosion system of the present invention is applied to a kerosene tank will be described.
[0023]
FIG. 2 is a configuration diagram showing an embodiment in which the atmospheric anticorrosion system of the present invention is mounted on a kerosene tank 20. In FIG. 2, 1 is an alternating current, 2 is a ground, 3 is a voltage-current controller, and 4 is an electrode. Reference numerals 151 to 153 denote square electrodes, 161 to 165 denote plate electrodes, 17 denotes a protective fence, 181 to 182 denote round electrodes, 19 denotes a pipeline, 20 denotes a tank, and 21 denotes a tank support.
[0024]
The alternating current 1 is supplied to the tank 20 by the electrode wiring 4 via the voltage / current controller 3, and the square electrodes 151, 152, 153, the plate electrodes 161, 162, 163, 164, 165, and the round electrodes 181, 182 are provided. , And the anticorrosion voltage current 12 is supplied. Plate electrodes 163, 164 are also provided in the pipeline to the tank 20, and the anticorrosion voltage current 12 is supplied. Further, plate electrodes 165 are also provided on the protective fence 17, and the anticorrosion voltage / current 12 is controlled and supplied. Each electrode is held by the stud bolt 7 and does not fall off.
[0025]
As shown in the figure, the ground attached to the tank 20 supported and fixed by the support portion 21 is such that the anticorrosion current (electrons) is quantitatively controlled in a wide range depending on the structure of the tank 20, the rust, the corrosion state, and the corrosive environment. A plurality of grounds are efficiently provided on the tank supporting portion, the pipeline, the ladder, and the like from the entire structure of the tank in order to facilitate the formation of the anticorrosion potential circuit (electronic circuit).
[0026]
The anticorrosion voltage / current to be supplied through the voltage / current controller 3 is selected and selected from (0.5 to 10 V) in the over-corrosion protection environment. The voltage output is configured so that a direct current low voltage of (0.5 to 15 V) and a weak current of (0.01 to 320 mA) can be controlled and supplied to the entire surface of the steel structure 11 through the anticorrosion electrode (anode). The earth 2 is connected to the steel structure.
[0027]
The deposits such as raindrops or dew 8 and sea salt particles 9 attached to the surface of the tank 20 are electrolytes, and the anticorrosion voltage and the anticorrosion current 12 are controlled and supplied to the tank 20 via the electrolyte. Is supplied with the anticorrosion potential (electrons) to prevent ionization of the metal of the steel material structure in the tank 20, thereby obtaining an anticorrosion continuation effect.
[0028]
Further, the present inventors installed the anticorrosion system of the present invention three months after re-coating the kerosene tank, and followed the rust and corrosion prevention effect for 5 years. The installation environment is heavy snow area and the tank from late November to late April in the winter is more than 2m thick. The acid rain and acid snow are considered problematic. It rusted in three and a half years, and in the fourth year the entire tank was covered with red rust, and the appearance was so severe that it had to be repainted every four years. Five years after installation, there were no traces of rust on any of the tank, the protective fence, the ladder, the tank support, and the pipeline. The anticorrosion electrode (anode) in which the anode was fixed to a stainless steel bolt by a stud welding machine did not fall off even after 5 years, and there was no disconnection or corrosion of the wiring. The rust preventing effect was completely prevented even by repainting, and no rust was observed even after 6 years. At that time, for a period of 1.5 times or more, it was found that the anticorrosion voltage / current was controlled through the electrolyte of the rusting factor of acid rain and acid snow to continue to prevent rusting. We also know various kinds of corrosion and corrosion prevention such as salt water environment, sulfurous acid gas, calcium chloride, salt damage (rock salt), chicken dung, ranch manure, environment corrosion of sea salt particle adhesion, corrosion, steel plate corrosion perforation, etc. The effect was found to be 1.5 to 3 times the anti-corrosion effect, and the rusting and corrosion factors of the coated steel structure depended on the relative humidity, the amount of sea salt particles attached, and the atmospheric environment including moisture and salt content. Rust and corrosion progress due to ionization of the electrolyte such as dew condensation formed by the water absorption and moisture retention action of the attached particles and the like. The anticorrosion control object is energized from the anticorrosion voltage / current controller to the electrolyte via the anticorrosion electrode, the ground is connected to the anticorrosion target, and the anticorrosion potential circuit (electronic circuit) is secured, so that the details can be efficiently measured in a wide range of details. It was possible to obtain knowledge of various and various anti-corrosion effects, in which the control was energized and the anti-corrosion was continuously maintained. In addition, the anticorrosion system of the present invention is capable of preventing corrosion of a light-shielding portion when shielding a metal structure formed with an anticorrosion coating layer containing a titanium oxide and a titanium oxide and a conductive metal oxide containing tin oxide in the titanium oxide. The anticorrosion effect of the formation of the conductive metal oxide coating layer and the anticorrosion properties of the cathodic anticorrosion system in the air environment have great promise for further anticorrosion effects.
[0029]
【The invention's effect】
As is clear from the above-described configuration, examples, and execution tests, the anticorrosion system in the atmospheric environment of the present invention is efficient and has excellent durability of the anticorrosion effect. In the environment where the relative humidity is high and the amount of sea salt particles adheres, the environment where the relative humidity is high and the amount of sea salt particles adheres is small Even in an environment where the relative humidity is low and the amount of sea salt particles attached is large, the anticorrosion voltage / current is automatically and variably controlled according to the humidity of the environment or the completely wet state of the seawater environment and the drying process. With pulsed energization configuration, it is possible to select and set the voltage output to avoid excessive corrosion protection in a constantly wet environment of seawater environment, and its anticorrosion effect is a severely corrosive saltwater wet environment and sea salt particle adhesion environment, Calcium chloride Of various corrosion and corrosion prevention effects such as rust, corrosion and steel plate perforation in severe corrosive environment such as humid, sulfur dioxide gas, chemical fertilizer, poultry manure, ranch manure treatment, etc. The proof that the protection effect and the rusting time after re-painting are 1.5 times or more of the conventional ones is shown in the kerosene tank embodiment described above. The coating protection effect and the corrosion protection effect, which have the coating protection effect of the water spot prevention effect, have been established from the literature and theory that the anticorrosion current is about 1 μA in the literature and theory that suppress and prevent the humic behavior. Obtained. Further, the atmospheric anticorrosion system of the present invention is a titanium oxide and a titanium oxide, and a metal structure containing a conductive metal oxide-containing anticorrosion coating layer containing tin oxide in titanium oxide, at the time of light blocking of anticorrosion defects, The combination of the anti-corrosion effect of the anti-corrosion coating layer of the conductive metal oxide and the anti-corrosion property of the atmospheric anti-corrosion system in the light-shielding part and the anti-corrosion problem environment further enhances the anti-corrosion and anti-corrosion effect. With great expectations, we have been able to provide a safe, eco-friendly and efficient atmospheric anti-corrosion system in the atmospheric environment that has continued to prevent corrosion and corrosion of painted steel structures and has a paint protection effect. .
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of an atmospheric anticorrosion system of the present invention.
FIG. 2 is a configuration diagram illustrating an embodiment in which the atmospheric anticorrosion system of the present invention is mounted on a kerosene tank.
[Explanation of symbols]
1. 1. AC current Ground3. Voltage / current control unit 4. 4. Wiring for electrode Electrode anode6. Insulation material7. 7. Stud bolt 8. Rainwater or condensation Sea salt particles10. 10. Electrode anode wiring Steel structure 12. 12. Corrosion protection voltage / current Fuse 14. Embedded electrode with input terminal 151. Square electrode 152. Square electrode 153. Square electrode 161. Plate electrode 162. Plate type electrode 163. Plate type electrode 164 Plate type electrode 165. Plate electrode 17. Guard fence 181. Round electrode 182. Round electrode 19. Pipeline 20. Tank 21. Tank support