高强度弹簧钢60Si2CrVA与SAE9254在NaCl溶液中的腐蚀行为  

Corrosion Behavior of High Strength Spring Steels 60Si2CrVA and SAE9254 in NaCl Solution

作　　者：朱敏[1,2] 聂轮 袁永锋 郭绍义[1] 尹思敏[1] 俞高红 ZHU Min1,2, NIE Lun2,YUAN Yongfeng1, GUO Shaoyil, YIN Simin1, YU Gaohong1(1. School of Mechanical Engineering ＆ Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China; 2. Zhejiang Meili High Technology Co., Ltd., Xinchang 312500, China)

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018 [2]浙江美力科技股份有限公司,新昌312500

出　　处：《腐蚀科学与防护技术》2018年第5期481-488,共8页Corrosion Science and Protection Technology

基　　金：国家自然科学基金(51501164);浙江省自然科学基金(LY18E010004);中国博士后科学基金(2017M621974)~~

摘　　要：采用盐雾实验、电化学阻抗谱、极化曲线及慢应变速率拉伸实验(SSRT)系统研究了高强度弹簧钢60Si2CrVA与SAE9254在5%(质量分数) NaCl溶液中的腐蚀行为。盐雾实验表明,两种弹簧钢的平均腐蚀速率随时间延长均呈现先增加后减小的趋势,60Si2CrVA钢的长周期耐腐蚀性能更好,而SAE9254钢初期抗腐蚀性能较好。两种弹簧钢的腐蚀形态为点蚀,腐蚀产物均主要由α-FeOOH,β-FeOOH,Fe_2O_3及Fe_3O_4组成。电化学阻抗谱和极化曲线测试均表明,相比于SAE9254钢,60Si2CrVA钢具有更好的耐蚀性。SSRT结果表明,60Si2CrVA钢的SCC敏感性低于SAE9254钢,两者均呈现出浅裂纹沿晶扩展和深裂纹穿晶扩展的混合模式,SCC机制主要为氢脆机理。The corrosion behavior of high strength spring steels 60Si2CrVA and SAE9254 in 5%（mass fraction） NaCl solution has been investigated by means of salt spray test, electrochemical impedance spectroscopy（EIS）, polarization curve, and slow strain rate testing（SSRT）. The result of salt spray test shows that the average corrosion rates of the two spring steels increase firstly and then decrease with time. The tested steels exhibit obviously pitting corrosion, and the corrosion product of the steels consists mainly of α-FeOOH, β-FeOOH, Fe2O3 and Fe3O4. In the early stage, SAE9254 steel has better corrosion resistance. However, 60Si2CrVA steel possesses better corrosion resistance in long term, which is also indicated by the results of EIS test and polarization curve. The SSRT result shows that the SCC susceptibility of 60Si2CrVA steel is lower than that of SAE9254 steel. The mixed crack propagation mode of the two steels tested by a constant potential of -1V（vs SCE） in NaCl solution is that the shallow crack is intergranular（IGSCC）, and the deep crack is transgranular（TGSCC）, and the SCC mechanism may mainly accord with hydrogen embrittlement（HE）.

关 键 词：弹簧钢 腐蚀行为 点蚀 SCC敏感性 氢脆 

分 类 号：TG172.3[金属学及工艺—金属表面处理]