Sb对Mg-5Al-2Sr合金耐腐蚀性能的影响

中国腐蚀与防护学报

2012, Vol. 32

Issue (6): 478-484

研究报告

本期目录 | 过刊浏览

Sb对Mg-5Al-2Sr合金耐腐蚀性能的影响

刘子利¹,朱晓春¹,周桂斌¹,李健²

1. 南京航空航天大学材料科学与技术学院南京 210016
2. 江苏中翼汽车新材料科技有限公司常熟 215542

EFFECTS OF Sb ADDITION ON CORROSION PROPERTIES OF Mg-5Al-2Sr ALLOY

LIU Zili¹, ZHU Xiaochun¹, ZHOU Guibin¹, LI Jian²

1. College of Materials Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016
2. Jiangsu Favour Automotive New Stuff Sci-Tech Co., Ltd, Changshu 215542

全文: PDF(1526 KB)

摘要:

采用失重法、极化曲线、电化学阻抗谱和腐蚀形貌等方法研究了微量Sb对Mg-5Al-2Sr合金在3.5 mass% NaCl中性水溶液中耐腐蚀性能的影响。结果表明，Mg-5Al-2Sr-xSb(x=0，0.3，0.6，1.0)合金在3.5 mass% NaCl中性水溶液中初期的腐蚀类型为点蚀，点蚀源于块状三元τ相和颗粒状SbSr₂相。这些相的数量越多，尺寸越大，合金的腐蚀愈严重。网状分布的Al_4Sr相能够成为合金腐蚀的有效障碍。Mg-5Al-2Sr合金中加入0.3% Sb不仅能够有效地细化α-Mg基体组织，同时促进了Al₄Sr相的形成，使该相的分布更趋网状化，该合金的自腐蚀电位明显正移，腐蚀电流密度减小，腐蚀速率降低，合金的耐蚀性能提高。

关键词 ： Mg-5Al-2Sr, Sb, 腐蚀性能

Abstract：

Corrosion weight loss, polarization techniques, electrochemical impedance spectroscopy(EIS) and corrosion morphology were used to estimate the impact of Sb addition on corrosion properties of Mg-5Al-2Sr alloys in 3.5% NaCl solution. Experimental results show that the initial corrosion types of Mg-5Al-2Sr-xSb(x=0, 0.3, 0.6, 1.0) alloy in 3.5% NaCl solution is pitting corrosion. Pitting originated in massive ternary τ phase and granular SbSr₂ phase. The larger amount and the bigger size of these phases corresponds to the poorer resistance. Mesh distribution Al₄Sr phase can become an effective barrier of corrosion. Adding 0.3% Sb not only refines the α-Mg matrix of Mg-5Al-2Sr alloy, but also promotes the formation of Al₄Sr phase which distributed more in network. The corrosion potential of the alloy shifts positive obviously, the corrosion current density and corrosion rate reduces, thus, the corrosion resistance of the alloy is improved.

Key words： Mg-5Al-2Sr Sb corrosion property

收稿日期: 2011-12-26

ZTFLH:

TG249.6

基金资助:

江苏省科技支撑计划项目(BE2010103)资助

通讯作者: 刘子利， E-mail: zililiu@sohu.com

Corresponding author: LIU Zili E-mail: zililiu@sohu.com

作者简介: 刘子利，男，1968年生，教授，博士, 研究方向为轻合金材料及其精密成形技术

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引用本文:

刘子利,朱晓春,周桂斌,李健. Sb对Mg-5Al-2Sr合金耐腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2012, 32(6): 478-484.
LIU Zili, ZHU Xiaochun, ZHOU Guibin, LI Jian. EFFECTS OF Sb ADDITION ON CORROSION PROPERTIES OF Mg-5Al-2Sr ALLOY. Journal of Chinese Society for Corrosion and protection, 2012, 32(6): 478-484.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I6/478

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