二層めつき鋼板の塗装性および耐食性に与える上層 Fe-P めつき付着量の影響(電気めつき)(<特集>表面処理)

概要

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Although Zn base alloy coated steel sheets show good corrosion resistance, their use in the exposed side of auto-bodies is not expected because of their poor phosphatability and paintability compared with those of uncoated cold rolled steel sheets. To modify these properties, an Fe-P alloy layer (2∿6g/m^2) is electroplated on Zn base alloy coated steel and double layer alloy coated steel has been developed. The addition of P into the upper Fe layer contributes to the formation of finely packed phosphate crystals in both spray and dip type phosphate treatments. The upper Fe-P layer also helps to suppress the formation of crater form paint defects during the cathodic electrodeposition. Moreover, the Fe-P alloy upper layer reduces blisters at cross cut portions of painted specimens during corrosion tests. When the upper layer coating weight is below 6g/m^2, the corrosion behavior, such as red rust formation and thickness reduction, of the double layer alloy coated steels is similar to that of the single layer Zn alloy coated steels.
社団法人日本鉄鋼協会の論文
1986-06-01