硅和锡对ZA27锌基合金耐腐蚀性能的影响  

Effects of Si and Sn on Corrosion Resistance of ZA27 Alloy

作　　者：李逸泰[1] 范鹏[1] 宋亮[1] 庞兴志[1] 曾建民[1] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室,广西南宁530004

出　　处：《机械工程材料》2006年第12期27-28,94,共3页Materials For Mechanical Engineering

摘　　要：在35g/L NaCl 水溶液中,用电化学测量系统测定了硅加入量分别为0.11%,0.19%,0.30%和锡加入量分别为0.10%,0.15%,0.21%,0.26%的 ZA27锌基合金的塔菲尔曲线、腐蚀电位、线性极化电阻和腐蚀电流密度等电化学参数,在扫描电镜下观察了腐蚀后的形貌,并与二元ZA27合金进行了比较。结果表明:硅和锡的加入使试验合金的腐蚀电位朝负向移动,腐蚀电流密度增加,均降低了 ZA27高铝锌基合金的耐腐蚀性能,其中锡的影响较大。The Tafel curves and electrochemical parameters such as free corrosion potential, resistance of linear polarization, corrosion current density of ZA27 alloys which contains 0. 11%, 0. 19%, 0. 30%Si, 0. 10%, 0. 15%, 0. 21%, 0. 26%Sn respectively, have been measured by using PS-168C electrochemistry measurement system in 35 g/L NaCl solution. The surface morphology of the samples after corrosion test was observed by SEM. Compared with the experimental result of ZA27 alloy, it is shown that the free corrosion potential of all the tested alloys shifts to negative and the their corrosion current densities increase with impurity elements addition. And impurity elements decrease corrosion resistance of ZA27 alloy. The ef fect of Sn is greater than that of Si.

关 键 词：ZA27锌基合金 耐腐蚀性能 腐蚀电位 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG113.23[金属学及工艺—金属材料]