通过晶间腐蚀实验、剥落腐蚀实验和电化学测试,结合光学显微镜、扫描电镜和透射电镜等分析手段,研究高锌超高强铝合金在不同时效状态下的腐蚀行为.结果表明:双级过时效和回归再时效可提高合金的抗腐蚀能力,在3.5％NaCl(质量分数)溶液中测试的极化曲线也表现出相同的趋势.晶界析出相尺寸和形态是影响合金腐蚀性能的主要因素.双级过时效和回归再时效可使晶间析出相粗化且呈断续分布,使腐蚀不能连续发展,从而提高合金的耐蚀性能.超高强铝合金在含Cl介质中腐蚀的发展动力学过程分为点蚀、晶间腐蚀和剥落腐蚀3个阶段.
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