Cu和Sb对ZA27合金耐腐蚀性的影响  

Effects of Cu and Sb on Corrosion Resistance of ZA27 Alloy

作　　者：范鹏[1] 宋亮[1] 庞兴志[1] 曾建民[1] 

机构地区：[1]广西大学有色金属材料及加工新技术教育部重点实验室

出　　处：《特种铸造及有色合金》2008年第5期401-403,共3页Special Casting & Nonferrous Alloys

基　　金：广西科技厅资助项目(桂科工0322009-4);广西研究生教育创新计划资助项目(2006105930805M19)

摘　　要：采用电化学和浸泡腐蚀试验研究了ZA27合金在质量浓度为35g/L的NaC1水溶液中的腐蚀行为,探讨了加入元素Cu、Sb对其塔菲尔曲线以及自腐蚀电位、线性极化电阻、自腐蚀电流等电化学参数的影响,并利用扫描电镜和能谱对各合金浸泡腐蚀后的形貌进行了观察。结果表明,Cu在适量的范围内能改善合金的耐蚀性,使试验合金的自腐蚀电位朝正向移动,腐蚀电流密度降低;含量过高时,对合金的耐蚀性反而有恶化作用。随着Sb含量的增加,试验合金的自腐蚀电位朝负向移动,腐蚀电流密度增加,降低了ZA27高铝锌基合金的耐腐蚀性能。The corrosion behavior of ZA27 alloys in 35 g/L NaCl solution has been examined by electrochemical and immersion corrosion tests. The effects of Cu and Sb on the Tafel curves and electrochemical parameters,including free corrosion potential,electric resistance of linear polarization,corrosion current,of the ZA27 alloy have been investigated. The surface morphology of the alloy after corrosion treatment has been observed by SEM (scanning electron microscope) and EDAX. The results indicate that low Cu content can improve the corrosion resistance of the ZA27 alloy,which is attributed to Cu making the free corrosion potentials shift to positive to decrease the corrosion current density,however,excessive Cu content can deteriorate the corrosion resistance. The free potential of the tested alloy shifts to negative to increase the corrosion current density with the increase of Sb,declining the corrosion resistance of the ZA27 alloy.

关 键 词：ZA27合金 耐腐蚀性 自腐蚀电位 

分 类 号：TG115.3[金属学及工艺—物理冶金]