Mn、Sn对铸造Al-7Si合金耐腐蚀性能的影响  

Effects of Mn and Sn on Corrosion Resistance of Al-7Si Cast Alloys

作　　者：崔国明[1,2] 李兴霞[2] 范鹏[1] 曾建民[1] 

机构地区：[1]广西大学有色金属及其加工新技术教育部重点实验室 [2]河南机电高等专科学校材料工程系

出　　处：《特种铸造及有色合金》2013年第5期477-479,共3页Special Casting & Nonferrous Alloys

基　　金：广西大学有色金属材料及其加工新技术教育部重点实验室开放基金资助项目(GXKFJ09-02)

摘　　要：采用电化学腐蚀和浸泡腐蚀研究了Al-7Si铸造合金在NaC1含量为3.5%的水溶液中的腐蚀行为,探讨了Mn、Sn对Al-7Si合金的塔菲尔曲线以及自腐蚀电位、腐蚀电流密度等电化学参数的影响,并利用电子分析天平和扫描电镜分别对各合金浸泡腐蚀后的质量损失和腐蚀形貌进行了测量与分析。结果表明,各试验合金均较快进入钝化状态。随着Mn、Sn的加入,各合金自腐蚀电位均向负向移动、腐蚀电流密度增高,腐蚀质量损失增大,耐腐蚀性能降低。同时合金的腐蚀形貌和腐蚀机理也发生转变。The corrosion behaviors of A1-7Si cast alloys in 3.5 % NaCl aqueous solution were examined by using electrochemical corrosion and immersion corrosion tests. Influence of manganese（Mn） and tin（Sn） on the Tafel curves and electrochemical parameters, such as free corrosion potential and corrosion current densities, of A1-7Si alloys were investigated. Moreover, the weight loss and morphology of the al- loys after immersion corrosion were measured and analyzed by analytical balance and scanning electron microscopy （SEM）. The results indicate that all the tested alloys can be passivated rapidly, and their corrosion potential is drifted to negative, meanwhile, their corrosion current density and corrosion weight loss are increased with the addition of alloy elements Mn and Sn, greatly deteriorating the corrosion resistance of the alloy. In addition, the corrosion morphology and corrosion mechanism of A1-TSi east alloys were described.

关 键 词：Al-Si铸造合金 耐腐蚀性 电化学试验 浸泡腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理] TG146.21[金属学及工艺—金属学]