Effect of calcium addition on the corrosion behavior of Mg-5Al alloy

被引：53

作者：

Kim, Keon Ha ^{[1
]}

Nguyen Dang Nam ^{[1
]}

Kim, Jung Gu ^{[1
]}

Shin, Kwang Seon ^{[2
]}

Jung, Hwa Chul ^{[2
]}

机构：

[1] Sungkyunkwan Univ, Dept Adv Mat Sci & Engn, Suwon 440746, South Korea

[2] Seoul Natl Univ, Sch Mat Sci & Engn, Res Inst Adv Mat, Seoul 151742, South Korea

来源：

INTERMETALLICS | 2011年 / 19卷 / 12期

关键词：

Corrosion; Precipitates; Casting; Microstructure; Corrosion behavior; MG-AL; MAGNESIUM ALLOYS; OPEN-CIRCUIT; MICROSTRUCTURE; PHASE; CA; SI; RESISTANCE; AZ91;

D O I：

10.1016/j.intermet.2011.07.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The corrosion behavior of four Mg-5Al-xCa alloys (x = 0.0 to 2.0 wt.%) was evaluated in an alkaline NaCl solution. Surface analyses indicated that the benefits of Ca addition are the refinement of the precipitates and a decrease in grain size. Furthermore, the refinement of the precipitates (Mg2Ca, Al2Ca) became more complete with increasing of Ca content. The electrochemical tests revealed that the pitting resistance was improved in Ca-containing specimens. In addition, the polarization resistance of the Mg-5Al specimens increased with increasing Ca content. This is due to the fact that precipitation which is expected to act as a barrier is more continuous over the Mg matrix with a smaller grain size and higher precipitation density. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1831 / 1838

页数：8

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