Cl^-浓度对镁-铝合金β相模型合金腐蚀电化学行为的影响  

Influence of Cl^- Concentration on Corrosion Behavior of a Model β-phase Magnesium-aluminum Alloy

作　　者：贾瑞灵[1] 翟熙伟[1] 严川伟[2] 

机构地区：[1]内蒙古工业大学材料学院内蒙古轻金属材料重点实验室,呼和浩特010051 [2]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《腐蚀科学与防护技术》2010年第6期474-478,共5页Corrosion Science and Protection Technology

基　　金：内蒙古工业大学科学研究项目(ZD200913)资助

摘　　要：对镁-铝合金β相模型合金在不同浓度的Cl^-溶液环境中的腐蚀电化学行为进行研究.结果表明,随着Cl^-浓度的增加,β相的自腐蚀电位依次降低.但β相与α相之间的电位差没有随Cl^-浓度的增加递增.β相在不同浓度的Cl^-溶液中均能发生钝化,随Cl^-浓度的增加点蚀击破电位降低,相应表面膜中含Mg的腐蚀产物种类也增多.在不同浓度Cl^-溶液环境中,β相模型合金的腐蚀电化学结果可以揭示β相的微电偶作用.The electrochemical behavior of a modelβphase Mg-Al alloy was investigated in solutions with different concentrations of Cl^- in comparison with modelαphase alloy.The results indicated that the increase of Cl^- concentration may decrease the corrosion potential ofβphase. However,there is no distinct in potential difference betweenβphase andαphase.Theβphase may be passivated in solutions with different concentrations of Cl^-.With the increasing of Cl^- concentration the pitting breakdown potential ofβphase slightly lower.There is excess Cl^- doping the formed corrosion scales onβphase surface as the Cl^- concentration increases.It is expected thatβphase in magnesium-aluminum alloy may play certain role in micro galvanic couple with substrate in atmosphere corrosion in sodium chloride polluted environments.

关 键 词：镁-铝合金 Β相 Cl-浓度 电化学腐蚀 

分 类 号：TG146.2[一般工业技术—材料科学与工程]