電気Zn-Ni合金めっき鋼板のりん酸塩処理性
1991 年 77 巻 7 号 p. 1058-1065
詳細
1991 年 77 巻 7 号 p. 1058-1065
The phosphotability of Zn-Ni alloy electroplated steel sheets was investigated, and the influence of phosphate film appearance was discussed.
1) When the alkaline degreasing was weak in phosphate treatment, it happened that the phosphate film of Zn-Ni alloy electroplated sheets had "irregular flow pattern" appearance. In this case, electropainting film had same "irregular flow pattern" appearance.
2) The surface of Zn-Ni alloy which had less than 13 wt% Ni content was easily covered with zinc oxide, and then zinc oxidation controlled the phosphate reaction and caused "irregular flow pattern" phosphate appearance.
3) In order to prevent this "flow pattern" phosphate appearance, immersion post treatment in electroplating solution had good effect.
4) As compared with "irregular flow pattern" appearance phosphate film, uniform appearance phosphate film by immersion post treatment had good performance of wet adhesion as well as good electropaintability.
