Fundamental research on corrosion resistance of protected steel sheets for automobiles

DOI Web Site 被引用文献16件 オープンアクセス
  • MIYOSHI Yasuhiko
    Surface Treatment Research Lab., R & D Laboratories-II, Nippon Steel Corporation
  • OKA Joji
    Surface Treatment Research Lab., R & D Laboratories-II, Nippon Steel Corporation
  • MAEDA Shigeyoshi
    Special Fundamental Research Lab.-III, R & D Laboratories-I, Nippon Steel Corporation

書誌事項

タイトル別名
  • Fundamental research on corrosion resistance of precoated steel sheets for automobiles.
公開日
1983
DOI
  • 10.2355/isijinternational1966.23.974
公開者
一般社団法人 日本鉄鋼協会

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説明

Corrosion behaviors of Precoated sheets for automobiles were studied basically. Weight loss of unpainted specimens, paint adhesion and perforation resistance were measured. Corrosion of unpainted sheet in a salty environment is cathodically controlled. Cathodic reactions are retarded effectively by corrosion products with a low electrical conductivity, such as Zn(OH)2 and ZnCl2•4Zn(OH)2. Al, Mg, Ni, Co or Mn alloyed Zn coated sheets exhibit a good performance because of the formation of above mentioned corrosion products. Paint adhesion depends greatly on the nature of the underlying phosphate layer. During cathodic electrodeposition of Zn coated sheet part of the phosphate film dissolves and gets defects because of high alkalinity. On the other hand, Zn-Fe and Zn-Ni alloy coated sheets have the defects repairing effect, and therefore show a better paint adhesion than Zn plated sheet. Perforation corrosion is caused by the formation of differential aeration cells in several car components. Perforation resistance was evaluated by the tests in a combined corrosive environment using jointed panel specimens. Heavil Zn coated sheets and primer coated sheets demonstrated a high resistance.

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