时效处理对超高强Cu-Ti合金腐蚀行为的影响  

Effect of aging process on corrosion behavior of Cu-Ti alloy with ultrahigh strength

作　　者：韩靓[1] 李周[1,2] 王胜玉[1] 李思[1] 王永如 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]宁波金田铜业(集团)股份有限公司,宁波315034

出　　处：《粉末冶金材料科学与工程》2016年第6期931-938,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51271203);国家支撑计划资助项目(2014BAC03B00);中南大学"创新驱动计划"资助项目

摘　　要：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3 d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Cu_2O,CuO和Al_2O_3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0.076 9和0.062 3 mm/a。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 NaC1 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 20 μm and 10μm, 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.

关 键 词：Cu-Ti合金 腐蚀行为 电化学分析 腐蚀速率 时效处理 

分 类 号：TG178[金属学及工艺—金属表面处理]