时效处理对Fe-Ni基奥氏体合金耐点蚀性能的影响  

Effect of Aging Treatment on Pitting Corrosion Resistance of Fe-Ni Based Austenitic Alloy

作　　者：郑军宝 闫英杰[1,2] 曹睿 ZHENG Junbao;YAN Yingjie;CAO Rui(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《电焊机》2024年第3期18-23,79,共7页Electric Welding Machine

基　　金：国家自然科学基金(51961024、52071170、52175323);甘肃省教育厅“双一流”科研重点项目(CSSYLXM-03)。

摘　　要：针对Fe-Ni基奥氏体合金在740℃时效处理后的析出相随时效时间的演变进行探究;并通过电化学腐蚀试验以及Mott-Schottky分析,研究了时效处理对合金耐腐蚀性能的影响。结果表明:740℃时效处理可以促进γ′沉淀强化相[Ni_(3)(Al,Ti)]在合金中的析出;随时效时间的增加,γ′析出相的密度和尺寸增加;同时,时效处理会增加合金表面点缺陷数量,降低合金钝化膜致密性,从而导致合金耐点蚀性降低;通过恒电位阳极极化处理能够有效降低合金表面点缺陷数量,提高合金耐点蚀性。The evolution of precipitated phase of Fe-Ni based austenite alloy after aging at 740℃with aging time was investigated.The effect of aging treatment on corrosion resistance of the alloy was studied by electrochemical corrosion test and Mott-Schottky analysis.The results show that aging treatment at 740℃can promote the precipitation ofγ′phase[Ni_(3)(Al,Ti)]in the alloy.The density and size ofγ′precipitated phase increase with aging time.At the same time,aging treatment can increase the number of spot defects on the alloy surface,reduce the density of the alloy passivation film,and lead to the decrease of the pitting resistance of the alloy.Constant potential anodic polarization treatment can effectively reduce the number of point defects on the alloy surface and enhance the alloy’s resistance to pitting corrosion.The self-corrosion current density of the alloy before aging is-6.6977 A/cm^(2),while after aging for 4 hours and 8 hours,it is-5.7164 A/cm^(2) and-6.0812 A/cm^(2),respectively,both higher than before aging.After electrochemical surface modification,the self-corrosion current density of the alloy before aging is-7.490125 A/cm^(2),and after aging for 4 hours and 8 hours,it is-6.127403 A/cm^(2) and-6.486164 A/cm^(2),respectively,still lower than before aging.

关 键 词：Fe-Ni基奥氏体合金 时效处理 γ′析出相 耐点蚀性能 表面改性 

分 类 号：TG174.3[金属学及工艺—金属表面处理]