CORROSION BEHAVIORS OF THIXOFORMED AZ91D MAGNESIUM ALLOY IN NaCl AQUEOUS SOLUTION

J Chin Soc Corr Pro

2007, Vol. 27

Issue (4): 206-209 DOI:

Research Report

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CORROSION BEHAVIORS OF THIXOFORMED AZ91D MAGNESIUM ALLOY IN NaCl AQUEOUS SOLUTION

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甘肃联合大学；兰州理工大学

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Abstract The relationship between corrosion behaviors and microstructure of thixoformed （TH）AZ91D alloys and permanent mould cast （PMC） AZ91D alloys in 3.5% NaCl aqueous solution was studied by optical microscope，SEM and weight loss method. The result showed that the corrosion resistance of the TH alloy was higher than that of the PMC alloy because their microstructures were significantly different. For the TH alloy， due to the volume fraction of β phase in the substrate was lower than surface layer，the corrosion rate of the former was higher than the latter during the initial stage of corrosion test，but this difference decreased as the corrosion proceeded.The corrosion mainly occurred in the primary α particles and secondary α phase because these two structures were taken as the cathode and β phase as the cathode in galvanic corrosion.The Ecorr between the galvanic couples，the relative distribution of the α and β phases and the area ratio of the α phase to β phase exposured on the speci?鄄men surface were the main factors to determine the corrosion rate.

Key words: magnesium alloy thixoforming galvanic corrosion

Received: 10 January 2006

ZTFLH:

TG172.6

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. CORROSION BEHAVIORS OF THIXOFORMED AZ91D MAGNESIUM ALLOY IN NaCl AQUEOUS SOLUTION. J Chin Soc Corr Pro, 2007, 27(4): 206-209 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2007/V27/I4/206

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