Process for manufacturing chromated electro-galvanized steel sheet and sheet made thereby
Chromated electro-galvanized steel sheet excellent in corrosion resistance and process for manufacturing same
Partially alloyed galvanize product
Multi-layer plating for improved corrosion resistance
Corrosion resistant plating and method utilizing alloys having micro-throwing power
Anticorrosive overlap-coated steel material Patent #: 4190504
ApplicationNo. 06/087107 filed on 10/22/1979
US Classes:428/659, Next to Fe-base component (e.g., galvanized)205/176, At least one alloy coating420/513, ZINC BASE427/406, Zinc coating428/926, Thickness of individual layer specified428/935Electroplating
ExaminersPrimary: Rutledge, L. Dewayne
Assistant: Saba, W. G.
Attorney, Agent or Firm
International ClassC25D 5/10 (20060101)
Foreign Application Priority Data1978-11-22 JP
AbstractAn electro-galvanized steel sheet for coating excellent in bare corrosion resistance, corrosion resistance after coating and formability, which comprises: a steel sheet; a first electro-galvanized layer, as a lower layer, in an amount of from 5 to 120 g/m2 per side, formed on at least one surface of said steel sheet, said first electro-galvanized layer comprising either an electro-galvanized layer consisting essentially of zinc or a compound electro-galvanized layer consisting essentially of zinc, cobalt and at least one of chromium, indium and zirconium; and a second electro-galvanized layer, as an upper layer, in an amount of from 0.2 to 10 g/m2 per side, formed on said first electro-galvanized layer, said second electro-galvanized layer consisting essentially of an alloy layer of zinc and from 1 to 60 wt. % iron. Said electro-galvanized steel sheet for coating is adapted to serve particularly for external, underside and closed structures of an automobile.