高铝锌基合金的耐腐蚀性研究

在质量分数为3．5％的NaCl溶液介质中，用电化学测量系统测定了Al的质量分数为30％～50％，Cu的质量分数为1．0％～2．5％的Zn-Al合金的塔菲尔参数、线性极化电阻、自腐蚀电位等电化学参数。并在三维视频显微镜下观察了合金的腐蚀形貌。结果表明，Zn-Al合金的耐蚀性随Al含量的增加和Cu含量的减少而下降。在试验合金中Al的质量分数为30％、Cu的质量分数为2．5％的Zn-Al合金耐腐蚀较好。

Corrosion Resistance of High Al-Zn Base Alloy

Electrochemical parameters of the high Al-Zn base alloy containing 30%~50% Al and 1.0%~2.5% Cu, such as the Tafel parameters, resistance of linearization polarization (R_p) and corrosion potential (E_k), have been measured by electrochemical measuring system in 3.5% NaCl solution. Corrosion morphology observation by the 3D video frequency microscope (HI-SCOPE Advanced KH-3000) was conducted also. The results show that the corrosion resistance of the alloy can be declined with increasing Al content and decreasing Cu content. The optimum corrosion resistance of the alloy can be observed with 30% Al content and 2.5% Cu content.