The present invention provides an inorganic-organic composite-treated zinc-plated steel sheet whose treated coatings do not contain any chromium and which is excellent in corrosion resistance after degreasing, coating adhesion and electrodeposition coating performance.
The inorganic-organic composite-treated zinc-plated steel sheet, which is obtained by forming a zinc phosphate coating, in a coating weight of 0.3 to 5 g/m
2
, on the zinc-plated steel sheet surface and forming thereon a post-treatment coating, in a coating weight of 0.01 to 1 g/m
2
, by using a post-treatment composition containing at least one compound (A) selected from the group consisting of thiocarbonyl group-containing compounds, sulfide group-containing compounds and guanidyl group-containing compounds, an organic resin (B), a crosslinking agent (C) and an inorganic corrosion inhibitor (D).
本发明提供了一种无机-有机复合处理镀
锌钢板,其处理涂层不含
铬,在脱脂后的耐腐蚀性、涂层附着力和电沉积涂层性能方面都非常出色。
无机-有机复合处理镀
锌钢板是通过形成
磷酸锌涂层获得的,涂层重量为 0.3 至 5 g/m
2
在镀
锌钢板表面形成涂层重量为 0.3 至 5 克/米 2 的
磷酸锌涂层,并在其上形成涂层重量为 0.01 至 1 克/米 2 的后处理涂层。
2
使用后处理组合物,该组合物至少含有一种化合物 (A),该化合物选自由含
硫羰基化合物、含
硫化物基团化合物和含
鸟苷基团化合物、有机
树脂 (B)、
交联剂 (C) 和无机缓蚀剂 (D) 组成的组。