Effect of Ca addition on the corrosion resistance of gravity cast AZ31 magnesium alloy

被引：38

作者：

Yim, Chang Dong ^{[1
]}

Kim, Young Min ^{[1
]}

You, Bong Sun ^{[1
]}

机构：

[1] Korea Inst Machinery & Mat, Energy Mat Res Ctr, Chang Won 641831, Gyeongnam, South Korea

来源：

MATERIALS TRANSACTIONS | 2007年 / 48卷 / 05期

关键词：

magnesium alloys; calcium addition; corrosion resistance; galvanic corrosion; morphology of second phase;

D O I：

10.2320/matertrans.48.1023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of Ca addition on the corrosion resistance of AZ31 magnesium alloys was evaluated by observation of microstructure and measurement of corrosion potential and average corrosion rate. The main mechanism of corrosion of AZ31 +xCa (x = 0 similar to 5 mass%) alloys was galvanic-corrosion between alpha-Mg and second phase. But the propagation behavior of corrosion was different with Ca content. In the alloy containing below 0.7 rnass%Ca, a micro-galvanic cell formed between matrix alpha-Mg and second phase formed semi-continuously at grain boundaries and the corrosion progressed in transgranular mode. The propagation of corrosion was retarded when the corrosion front met the second phase acted as corrosion barrier. But in the alloys containing above 1 mass%Ca, a micro-galvanic cell formed between eutectic alpha-Mg and discontinuous second phase in the eutectic region and the corrosion rapidly progressed along eutectic alpha-Mg formed continuously at grain boundaries because the discontinuous second phase could not prohibit the propagation of corrosion effectively.

引用

页码：1023 / 1028

页数：6

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