Plated steel sheet having excellent coating performance

Details Plated steel sheet having excellent coating performance Plated steel sheet having excellent coating performance

C - Chemistry, Metallurgy

25

D

13/18, 204/25

C25D 5/10 (2006.01)

Patent

CA 1309055

- 1 - Abstract When a single-layer plated steel sheet comprising a coating of pure Zn or a Zn alloy (for example, a Zn-Fe alloy, a Zn-Ni alloy, etc.) is used in a cationic electrodeposition coating coating method e.g. for coating components of automobile bodies, craterings are generated on a coating film at the time of the electrodeposition coating thus impairing the coating appearance. Accordingly, this invention makes it possible to stably restrain the generation of craterings on a coating film by providing a coating comprising Fe containing boron (B) or a coating comprising an Fe-Zn alloy having a boron-containing Fe percentage of 50% or more, on the surface of the coating of the pure Zn- or a Zn alloy-plated steel sheet. The boron content in the Fe coating or the Fe-Zn alloy coating may be preferably controlled to 0.001 to 3 wt.%. The coating weight may be preferably controlled to 0.5 to 10 g/m2 (per one side) in the case of the Fe coating, and 0.2 to 8 y/m2 (per one side) in the case of the Fe- Zn alloy coating.

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