| 摘要 |
PCT No. PCT/JP87/00190 Sec. 371 Date Oct. 30, 1987 Sec. 102(e) Date Oct. 30, 1987 PCT Filed Mar. 27, 1987 PCT Pub. No. WO87/05950 PCT Pub. Date Oct. 8, 1987.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 such a use that cationic electrodeposition coating is carried out as in the case of components for automobile bodies, craterings are generated on a coating film at the time of the electrodeposition coating to impair the coating appearance. Accordingly, this invention is to make 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 g/m2 (per one side) in the case of the Fe-Zn alloy coating.
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