CORROSION RESISTANCE OF PASSIVATED FILM ON ELECTRODEPOSITED ZINC BASE ALLOYS

J Chin Soc Corr Pro

1998, Vol. 18

Issue (1): 41-46 DOI:

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CORROSION RESISTANCE OF PASSIVATED FILM ON ELECTRODEPOSITED ZINC BASE ALLOYS

AN Mao-zhong YANG Zhe-long ZHANG Jing-shuang TU Zhen-mi (Department of Applied Chemistry; Harbin Institute of Technology; Harbin 150001)

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Abstract The corrosion resistance of passivated films on electrodeposited Zn-Fe, Zn-Co, Zn-Ni alloys was 2-4 times higher than that on Zn. Results of XPS and AES showed that all these passive films were composed of CrO3, Cr2O3, Zn(OH)2, ZnO and H2O, and the relative contents of CrO3/Cr2O3 and Zn(OH)2/ZnO were basically the same. The only difference was that the total content of Cr in passivated film on electrodeposited zinc alloys was higher. It led to an integrated and fine protective film, which possessed self-repair ability. In addition, the presence of an iron-group metal enriched layer obstructed the corrosion process.

Key words: Zinc base alloy Electroplating Corrosion resistance Passivation

Received: 25 February 1998

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AN Mao-zhong YANG Zhe-long ZHANG Jing-shuang TU Zhen-mi (Department of Applied Chemistry; Harbin Institute of Technology; Harbin 150001). CORROSION RESISTANCE OF PASSIVATED FILM ON ELECTRODEPOSITED ZINC BASE ALLOYS. J Chin Soc Corr Pro, 1998, 18(1): 41-46.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I1/41

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