氯化钠浓度和温度对超高强铝合金腐蚀性能的影响  

Influence of NaCl concentration and temperature on corrosion property of ultrahigh strength Al alloy

作　　者：翟开华[1] 傅骏[1] 

机构地区：[1]四川工程职业技术学院,德阳618000

出　　处：《化工新型材料》2015年第10期129-131,共3页New Chemical Materials

基　　金：四川省科技计划项目基于熔融沉积(FDM)的快速熔模铸造关键技术研究(2015JY0039)

摘　　要：采用开路电位时间曲线和动电位极化手段表征了氯化钠浓度(0%、2%、3.5%和5%均为质量分数)、温度(15℃、25℃、35℃、45℃和60℃)对7B50铝合金电化学腐蚀性能的影响。结果表明:随着氯化钠浓度增大和温度升高,超高强铝合金腐蚀敏感性逐渐增大。氯离子浓度增大,开路电位OCP和自腐蚀电位Ecorr逐渐负移,阳极极化电流逐渐增大,表明铝合金的腐蚀速率逐渐增大;当温度低于35℃,极化曲线上观察不到点蚀电位,温度必须达到45℃才开始出现明显的点蚀电位Epit,且随着温度进一步升高,点蚀电位负移。The effect of NaCl concentration（0wt%,2wt%,3.5wt%,5wt%）and temperature（15℃,25℃,35℃,45℃,60℃）on the electrochemical corrosion behaviour of 7B50 Al alloy was investigated by open circuit potential（OCP）and polarization curve.Results showed that the corrosion resistance of 7B50 ascended with the increasing of NaCl concentration and temperature,respectively.OCP and corrosion potential shifted to more negative direction,the anodic current density increased with the increasing of chloride ion concentration.No pitting potential was found in the solutions under 35℃,while obvious pitting potential Epitcan be seen at the temperature of 45℃ and above,and the potential Epitshifted to more cathodic direction as the temperature keepts on rising.

关 键 词：超高强铝合金 氯化钠浓度 温度 极化曲线 

分 类 号：TG174[金属学及工艺—金属表面处理]