Effects of Ce,Ca and Sr Mixing Addition on Corrosion Behavior of AZ91 Alloy

Lü Yaqing1; Liu Shengfa2; Han Hui2

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Effects of Ce,Ca and Sr Mixing Addition on Corrosion Behavior of AZ91 Alloy
Issue 8, Pages: 636-638(2007)
Published： 2007 ，
DOI：

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[1]吕亚清,刘生发,韩辉.复合合金化对AZ91镁合金腐蚀性能的影响[J].特种铸造及有色合金,2007(08):636-638+573.

Lü Yaqing1, Liu Shengfa2, Han Hui2. Effects of Ce,Ca and Sr Mixing Addition on Corrosion Behavior of AZ91 Alloy. [J]. Special Casting & Nonferrous Alloys (8):636-638(2007)
[1]吕亚清,刘生发,韩辉.复合合金化对AZ91镁合金腐蚀性能的影响[J].特种铸造及有色合金,2007(08):636-638+573. DOI：

Lü Yaqing1, Liu Shengfa2, Han Hui2. Effects of Ce,Ca and Sr Mixing Addition on Corrosion Behavior of AZ91 Alloy. [J]. Special Casting & Nonferrous Alloys (8):636-638(2007) DOI：

摘要

利用静态失重法和金相观察研究了0.5%的Ce、0.2%的Ca、0.2%的Sr（质量分数）复合合金化对AZ91镁合金在质量分数为3.5%的NaCl水溶液中的腐蚀行为。结果表明

0.5%的Ce、0.2%的Ca、0.2%的Sr复合加入显著降低合金的腐蚀速率

其耐蚀性明显高于AZ91基体合金

也优于单独添加0.5%的Ce的合金。腐蚀性能提高的原因主要归结为:复合合金化导致α-Mg晶粒明显细化

Al元素的偏析减轻

块状的β-Mg17Al12相变为非连续网状分布。

Abstract

Effects of 0.5%Ce

0.2%Ca and 0.2%Sr mixing addition on corrosion resistance of AZ91 magnesium alloy in 3.5%NaCl aqueous solution were examined by static weight loss and metallographical observation. The results indicate that the 0.5%Ce

0.2%Ca and 0.2%Sr mixing addition can greatly decrease the corrosion rate of the alloy

and the corrosion resistance of the alloy is evidently superior to that of AZ91 matrix and to that of the alloy with only 0.5% Ce addition

which is attributed to the 0.5%Ce

0.2%Ca and 0.2%Sr mixing addition evidently refining the grain size of α-Mg phase and relieving the segregation of Al element as well as changing bulk β-Mg17Al12 phase into discontinuous net-like ones.