表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
電気化学的インピーダンス法による Sargent 浴中のクロム電析機構の解析
板垣 昌幸西山 明秀寺島 慶一
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2000 年 51 巻 10 号 p. 1030-1034

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The mechanism of electrodeposition of Cr in a Sargent bath was investigated with electrochemical impedance spectroscopy (EIS). Cr(VI)sol is reduced to Cr via two reaction intermediates, i.e., Cr(III)ad and Cr(II)ad. The current-potential curve for Cr(VI)sol reduction can be divided into three potential regions. Inductive semicircles were observed on the Nyquist plots of electrochemical impedance measured in two potential regions, where it was found that the inductive behavior originates from the actions of Cr(III)ad and Cr(II)ad. Moreover, results indicate that the hydrogen evolution influenced the Cr(VI)sol reduction rate. The simulated results on the basis of the reaction model as outlined are in agreement with the experimental results.

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