碳化硅颗粒增强7A04(SiCp/7A04)铝基复合材料的应用环境及其腐蚀状况都较复杂.过去,对它的研究方法多样,依据不同,因而其腐蚀结论有异,甚至矛盾.为了研究SiCp/Al复合材料的耐蚀性,用电化学法和失重法研究了SiC颗粒含量和粒度对SiCp/7A04铝基复合材料及基体合金耐腐蚀性能的影响.结果表明,与基体合金相比,SiCp/7A04铝基复合材料耐蚀性下降,SiC含量高的复合材料腐蚀较快,SiC颗粒尺寸越大,复合材料耐蚀性越好;采用扫描电镜(SEM)观察腐蚀后的微观形貌表明,SiC颗粒破坏了基体表面氧化膜的完整性,促进了点蚀的形成,但其自身的稳定性又阻碍了蚀孔的长大.
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