Effect of La on the corrosion morphology of AZ91

Acta Metall Sin

2008, Vol. 44

Issue (10): 1247-1252 DOI:

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Effect of La on the corrosion morphology of AZ91

Wu Guohua

上海交通大学;材料学院

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Wu Guohua. Effect of La on the corrosion morphology of AZ91. Acta Metall Sin, 2008, 44(10): 1247-1252 .

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Abstract The microstructure, corrosion morphology and corrosion product of AZ91D and AZ91D-1.0La alloy were investigated. With the addition of 1% La in AZ91D, not only rod-like Al11La3 and blocky Al8LaMn4 phase, but also more fine laminar β phase-Mg17Al12 around large β phase particles formed. The fine laminar β phase obviously restrained the further development of corrosion, which greatly improved the corrosion resistance of AZ91D. Al11La3 phase was cathodic phase, but this phase did not accelerate corrosion of α matrix because Al11La3 was rod-like phases, which only offered a small cathodic area. However, blocky Al10Ce2Mn7 phase obviously accelerated corrosion of α matrix because of its large cathadic area. Al11La3 and Al8LaMn4 are corrosion resistant phases, but they could not restrain the development of corrosion because their distribution was not continuous.

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Received: 22 October 2007

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TG146.2

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