时效处理对超高强Cu-Ti合金腐蚀行为的影响

摘要

The corrosion behavior of solid solution water quenched Cu-2.7Ti-0.15Mg-0.1Ce-0.1Zr alloys treated with single-stage aging process and combined aging process in 3.5%NaCl solution at 30℃was studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), annual average corrosion rate tests and electrochemical tests. The results show that combining aging process can effectively increase the corrosion resistant of Cu-Ti alloy. The densification corrosion products form on the surface of both single-stage aged and combining aged alloys after immersing in NaCl solution for 3 d, and those products can protect the alloy from corrosion. When the corrosion time increases to 30 d, the corrosion extended and the amount of oxide corrosion products increased and mainly composed of Cu2O, CuO and Al2O3 complex compounds. As immersed for 30 d, the corrosion depth of single-stage aged and combining aged alloy are 20mm and 10mm, respectively;the annual average corrosion rate of single-stage aged and combining aged alloy are 0.076 9 mm/a and 0.062 3 mm/a, respectively.%将固溶水淬处理后的Cu-2.7Ti-0.15Mg-0.1Ce-0.1Zr合金分别进行单级时效和组合时效处理，然后在30℃的3.5% NaCl溶液中进行腐蚀实验，利用透射电镜、扫描电镜、能谱分析、腐蚀速率测试、极化曲线和交流阻抗谱的测试与分析，研究合金的腐蚀行为。结果表明：组合时效有利于提高合金的耐腐蚀性能。腐蚀3d后，合金表面生成致密的腐蚀产物膜，对合金表面具有良好的保护作用。浸泡腐蚀30 d后，腐蚀程度加深，腐蚀产物增多，腐蚀产物主要为Cu2O，CuO和Al2O3等组成的络合物，单级时效合金和组合时效合金的腐蚀深度分别为20和10μm，年平均腐蚀速率分别为0.0769和0.0623 mm/a。