Feイオン共存下での電気Znめっきにおける不純物の共析挙動(表面処理・腐食)

概要

論文の詳細を見る
The codeposition behavior of impurity Fe with Zn was investigated galvanostatically over the current density range from 1 to 1000 A/m^2 at 40℃ in zinc sulfate solution of pH 3 containing 5000ppm of Fe^<2+> and the other organic or inorganic impurity. Fe hardly codeposited with Zn in the solution containing both Fe and Mo or Ni as impurity. The codeposition of Fe seems to be strongly suppressed in the presence of Zn^<2+> ions due to the adsorption of Zn hydroxide preferentially formed on the cathode. However, in the solution containing Fe and Cu, Fe evidently codeposited with Zn. The Fe content in deposit decreased with increasing the current density. The role of codeposited Cu is considered to promote Fe deposition by providing an active sites free from adsorbed Zn hydroxide. On the other hand, in the solution containing Fe and stearyle benzyl ammonium chloride (C18-Benzyl) as impurities, the codeposition of Fe was significantly recognized. The cathode potential for Zn deposition was greatly polarized by addition of C18-Benzyl and the Fe content in deposit increased with increasing the current density.
社団法人日本鉄鋼協会の論文
2007-01-01