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Perforation depth became smaller as a coating weight of pure zinc electroplated steel sheet increased. Zinc alloy coated type sheets such as Zn-Ni, Zn-Fe double-layer, galvannealed were more corrosion resistant than the pure zinc type sheets when compared at the same coating weight. ...Zinc alloy coated type sheets such as Zn-Ni, Zn-Fe double-layer, galvannealed were more corrosion resistant than the pure zinc type sheets when compared at the same coating weight. Organic coated Zn-Ni sheet showed the highest resistance.

A new double-layer electroplated steel sheet has been developed. The steel sheet is composed of an upper Zn-Fe (80-90%) alloy layer which has good paint adhesion and a lower Zn-Ni (10-15%) alloy layer which has good corrosion resistance. Paintability, corrosion resistance and workability of the steel sheet were investigated. This coated steel sheet was revealed to be suitable for the automobile use.