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.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第12期27-28,94,共3页
Materials For Mechanical Engineering
