Effect of $\beta$ Phase on the Initial Atmospheric Corrosion Behaviour of the Magnesium-Aluminum Alloys by  n-situ
Electrochemical Impendence Spectra

Chin J Mater Res

2010, Vol. 24

Issue (3): 245-253 DOI:

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Effect of $\beta$ Phase on the Initial Atmospheric Corrosion Behaviour of the Magnesium-Aluminum Alloys by n-situ
Electrochemical Impendence Spectra

JIA Ruiling², ZHAI Xiwei², YAN Chuanwei¹, WANG Fuhui¹

1.State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2.Key Laboratory for Superlight Materials of Inner Mongolia, Inner Mongolia University of Technology, Huhhot 010051

Cite this article:

JIA Ruiling ZHAI Xiwei YAN Chuanwei WANG Fuhui. Effect of $\beta$ Phase on the Initial Atmospheric Corrosion Behaviour of the Magnesium-Aluminum Alloys by n-situ
Electrochemical Impendence Spectra. Chin J Mater Res, 2010, 24(3): 245-253.

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Abstract

The in-situ electrochemical impedance spectrum measurements were conducted to investigate the early stage of the atmospheric corrosion behavior of the magnesium alloys with different volume fractions of β phase. The results indicated that β phase played a key role in the course of atmospheric corrosion of the magnesium alloys that was induced by NaCl particles centralized in the early time period. During the early ten hours the magnesium alloys with high volume fraction β phase had a bigger chargetransfer resistance, showing a better corrosion resistance. This phenomenon could be attributed to the better corrosion resistance of β phase. However, a faster corrosion occurred for the magnesium alloys with high volume fraction β after ten hours when the β phases were broken and the charge-transfer resistance dropped dramatically due to the high concentration of Cl−. As the exposure time prolonged, the protective function of the corrosion product films in Mg–3Al alloy was significantly better than those in the other two alloys as they helped slow down the corrosion rate of magnesium alloys with less volume fraction β phase.

Key words: magnesium-aluminum alloy β phase atmospheric corrosion Electrochemical Impendence Spectra

Received: 27 November 2009

ZTFLH:

TG172

Fund:

Supported by National Natural Science Foundation of China No.50571105.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2010/V24/I3/245

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