采用动电位极化试验研究了7075-TiB2铝基复合材料的腐蚀行为.结果表明,该复合材料的腐蚀率与TiB2颗粒的比例成对应关系,而这主要与由原位TiB2颗粒引起的位错密度的增加有关.选择性点蚀具有晶粒间非对称的特点,主要归因于由TiB2颗粒与铝基体的热膨胀系数错配所致的局部位错密度不同.晶间腐蚀易于发生于大角度晶界,而特殊晶界和小角度晶界则表现出耐腐蚀性.晶内TiB2颗粒及其与铝基体的界面均无腐蚀发生.沿晶TiB2颗粒与晶界交汇的界面受晶间腐蚀的影响.
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