目前,鲜见有关对AZ31镁合金采用搅拌摩擦加工改善其微观形貌进而提高其耐蚀性能的报道.采用电化学测试仪、光学显微镜、扫描电镜及分析天平研究了AZ31镁合金搅拌摩擦加工前后在3.5％NaCl溶液中的腐蚀行为.结果表明:在含Cl-溶液中,与原材AZ31相比,加工后的AZ31自腐蚀电位较高,自腐蚀电流密度较小,阻抗较大,且腐蚀失重速率较小,两者的腐蚀机制均为点蚀,加工后的AZ31点蚀程度较轻,形成了细小的等轴晶及第二相的固溶,提高了其耐蚀性能.
参考文献
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