MICROSTRUCTURE OF THE 55％ Al-Zn ALLOY COATING ADN INFLUENCE OF SILICON CONTENT ON ITS CORROSION BEHAVIOUR

J Chin Soc Corr Pro

1986, Vol. 6

Issue (2): 91-102 DOI:

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MICROSTRUCTURE OF THE 55％ Al-Zn ALLOY COATING ADN INFLUENCE OF SILICON CONTENT ON ITS CORROSION BEHAVIOUR

Meng Rongxiang and Yang Xizhen(Shandong Engineering Institute)

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Abstract The influence of additive amount of Si on the microstructure and corrosion behaviour of 55％ Al-Zn-1.6％Si alloy hot-dip coating has been investigated. It is shown that small amount of si (1～20％) had little influence on the microstructure and corrosion resistance while amount of Si>2％ would show up free crystals of Si or silicon compounds condensed together with the interdendritic quasi-eutectic Zn-rich phase thereby increasing the electrochemical heterogeneity of the coating and decreasing its corrosion resistance.The corrosion current density of each phase on the multiphase electrode has been calculated by computerizing technique, combined with the simulating phase method. The relation between the corrosion rate of the coating and the additive amount of Si has been founded quantitatively.

Received: 25 April 1986

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Meng Rongxiang and Yang Xizhen(Shandong Engineering Institute). MICROSTRUCTURE OF THE 55％ Al-Zn ALLOY COATING ADN INFLUENCE OF SILICON CONTENT ON ITS CORROSION BEHAVIOUR. J Chin Soc Corr Pro, 1986, 6(2): 91-102.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1986/V6/I2/91

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