采用光学显微镜和常规力学性能测试分析了微量稀土对HA177-2铝黄铜组织和力学性能的影响,结合静态腐蚀实验研究了添加稀土后合金耐腐蚀性能的变化,并利用扫描电镜、能谱分析和XRD等方法对腐蚀产物层进行了分析.结果表明:添加适量稀土可以使铝黄铜晶粒细化,强度提高,但塑性有所下降;在3.5%NaCl溶液中,含稀土铝黄铜比不含稀土的铝黄铜耐蚀性能好,表面形成一层致密且与基体结合牢固的腐蚀产物层,其主要成分:内层为Al2O3和稀土氧化物,外层为Cu、Zn的碱式氯化物和氯化物;而在3.5%NaCl+0.05%S2-溶液中,添加稀土虽能改善腐蚀产物层结构,但膜层已被Cu2S严重脆化,合金耐腐蚀性能反而略有下降.
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