研究了压铸镁合金AZ91D在去离子水和3.5%NaCl溶液中的腐蚀行为.采用失重法测定镁合金的腐蚀速率,扫描电子显微镜观察腐蚀后试样的表面形貌,分别测定其在去离子水和3.5%NaCl溶液中20℃和50℃下的开路电位及极化曲线.结果表明,随着温度的升高压铸镁合金的开路电位降低,耐蚀性能下降,相同温度下其在含有C1-溶液中的开路电位低于无Cl-溶液中的开路电位.在3.5%.NaCl溶液中,随着温度升高压铸镁合金的腐蚀电位明显负移,耐蚀性降低;AZ91D的腐蚀形貌以点蚀为主,腐蚀速率随时间的延长而降低.
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