THE APPLICATION OF E-pH DIAGRAM FOR ANALYZING THE CORROSION BEHAVIOR OF 55％Al-Zn 1.6％Si COATING

J Chin Soc Corr Pro

1986, Vol. 6

Issue (2): 81-90 DOI:

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THE APPLICATION OF E-pH DIAGRAM FOR ANALYZING THE CORROSION BEHAVIOR OF 55％Al-Zn 1.6％Si COATING

Du Ailing and Yang Xizhen(Shandong Engineering Institute)

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Abstract Both the E-pH equilibrium diagram and the experimental E-pH diagram were used to investigate the corrosion process and characteristics of 55％ Al-Zn-1.6％Si coating.Chemical analysis was used to trace the total corrosion process of the coating in solutions containing Cl-with different pH values(pH=3～5) The corrosion mechanism was revealed to be selective dissolution of Znrich phase or elementary Zn at the very beginning, but rapidly coming to the propotional dissolution of the Al-Zn alloy.The micrography showed that the coating has diverse characters in four different pHvalue regions, feing coincideut with the conclusions derived from the E-pH equilibrium diagram.

Received: 25 April 1986

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Du Ailing and Yang Xizhen(Shandong Engineering Institute). THE APPLICATION OF E-pH DIAGRAM FOR ANALYZING THE CORROSION BEHAVIOR OF 55％Al-Zn 1.6％Si COATING. J Chin Soc Corr Pro, 1986, 6(2): 81-90.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1986/V6/I2/81

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