Coating processes – Coating by vapor – gas – or smoke – Metal coating
Patent
1997-01-24
1998-05-05
Silverberg, Sam
Coating processes
Coating by vapor, gas, or smoke
Metal coating
427251, C23C 1456, C21D 950
Patent
active
057471118
ABSTRACT:
A Zn-Mg binary coating layer formed on a steel sheet has the tri-layered structure that the first sublayer composed of a Zn-Mg alloy having Mg concentration of 0.5 wt. % or less, the second sublayer composed of a Zn-Mg alloy having Mg concentration of 7 wt. % or more and the third sublayer composed of a Zn-Mg alloy having Mg concentration of 0.5 wt. % or less are successively laminated. The coating layer may have the penta-layered structure wherein sublayers composed of a Zn-Mg alloy having Mg concentration of 2-7 wt. % are additionally interposed between the high-Mg and low-Mg sublayers. A Zn-Fe or Zn-Fe-Mg alloy layer may be formed at the boundary between the substrate steel and the coating layer. The adhesion ratio of the first sublayer to the top sublayer is preferably 1.2 or more, while the high-Mg sublayer is preferably conditioned to the mixed structure of a Zn.sub.2 Mg phase with a Mg-dissolved Zn phase. Due to the specified lamellar structure, the intrinsic properties of the high-Mg sublayer is sufficiently exhibited, and the secondary paint adhesiveness of the coating layer is excellent. Consequently, the coated steel sheet is useful as structural members or parts exposed to a severe corrosive atmosphere in various industrial fields.
REFERENCES:
Extended Abstract--"Effect of Coating Structure on Corrosion Resistance of ZN-MG Alloy Vapor Deposited Steel Sheets", vol. 93/1, Jan. 1, 1993, pp. 1948-1949.
Ariyoshi Yasumi
Fukui Yasushi
Matsuno Masanori
Miono Tadaaki
Saito Minoru
Nisshin Steel Co. Ltd.
Silverberg Sam
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