A PHOTOELECTROCHEMICAL STUDY OF CUPRO-NICKEL AND COPPER ELECTRODES IN ALKALINE SOLUTIONS

J Chin Soc Corr Pro

1998, Vol. 18

Issue (2): 151-154 DOI:

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A PHOTOELECTROCHEMICAL STUDY OF CUPRO-NICKEL AND COPPER ELECTRODES IN ALKALINE SOLUTIONS

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Abstract The electrochemical behavior of both 7%Ni-93%Cu alloy electrode and pure Cu electrode in alkaline solutions was studied by cyclic voltammetry and photocurrent response method. The alloy electrode had a larger p-type photoresponse than that on the Cu electrode, which implied a thicker CU2O layer on the alloy electrode surface resulting from NiO. In 0.05mol/L Na2SO4 solution (pH=9.1), the Cu electrode showed a p-type photoresponse initially, which changed to n-type when pitting corrosion occured at potentials more possitive than the critical breakdown potential. The transition from p-type to n-type might be related to the doping of the Cu2O film by SO42- ions.

Key words: Copper Cu-Ni alloy Corrosion Photoelectrochemistry

Received: 25 April 1998

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ZHOU Guo-ding Kamkin A (Electrochemical Research Group; Shanghai Institute of Electric Power; Shanghai 200090)XU Qun-jie (East China University of Science Technology; Corrosion Prevention Center; Shanghai 200231). A PHOTOELECTROCHEMICAL STUDY OF CUPRO-NICKEL AND COPPER ELECTRODES IN ALKALINE SOLUTIONS. J Chin Soc Corr Pro, 1998, 18(2): 151-154.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I2/151

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