Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (10): 1607-1611.doi: 10.3866/PKU.WHXB20071022

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Mechanismof Cr(III) Electrodeposition in Carboxylic Acid-Urea System

MA Li-Wen; CHEN Bai-Zhen; HE Xin-Kuai   

  1. School of Metallurgical Science and Engineering , Central South University, Changsha 410083, P. R. China; School of Packaging and Printing, Hunan University of Technology, Zhuzhou 412008, Hunan Province, P. R. China
  • Received:2007-03-05 Revised:2007-06-20 Published:2007-10-01
  • Contact: CHEN Bai-Zhen E-mail:yhschen@mail.csu.edu.cn

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Abstract: Cyclic voltammetry, steady polarization and alternating current impedance were used to study the mechanism of Cr(III) electrodeposition in carboxylic acid-urea system. The results indicated that the trivalent chromium ion got three electrons by two steps in which one electron was got firstly and two secondly. The two steps were all nonreversible reductions with chemical transformation. The kinetic parameters, such as reaction orders, Tafel slopes and apparent transfer coefficients calculated from the theoretical kinetics equation were agreed well with the experimentally measured ones.

Key words: Trivalent chromium, Carboxylic acid, Urea, Mechanism, Kinetics equation