Kinetics and mechanism of chromium electroplating from Cr(III) baths

被引：26

作者：

Danilov, FI ^{[1
]}

Protsenko, VS ^{[1
]}

机构：

[1] Ukrainian State Univ Chem Technol, Pr Gagarina 8, UA-49005 Dnepropetrovsk, Ukraine

来源：

PROTECTION OF METALS | 2001年 / 37卷 / 03期

关键词：

Chromium; Inorganic Chemistry; Kinetic Equation; Catalytic Effect; Diffusion Current;

D O I：

10.1023/A:1010490126064

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Kinetics of step-wise discharge of Cr(III) to Cr(0) in electrolytes containing aminoacetic acid is studied. The limiting current of Cr(II) ion discharge to metal is much lower than the limiting diffusion current of Cr(III) reduction to Cr(II), which results in the accumulation of Cr(II) ions in the electrolyte even at the potentials of the limiting current of chromium electroplating. The apparent catalytic effect of OH- ions during Cr(II) discharge is associated with the formation of electroactive hydroxocomplexes of bivalent chromium. The kinetic equation of the studied process is derived and analyzed. The probable nature of the limiting currents of chromium electroplating is discussed.

引用

页码：223 / 228

页数：6