3种成分中碳合金钢的显微组织及在含Cl^(-)环境下的耐腐蚀性能  

Microstructure and Corrosion Resistance in Cl^(-) Containing Environment of Three-Composition Medium Carbon Alloy Steel

作　　者：王丹[1,2] 钟庆东 杨健[1] 章书剑 WANG Dan;ZHONG Qingdong;YANG Jian;ZHANG Shujian(Shanghai Key Laboratory of Modern Metallurgy and Material Processing,Shanghai University,Shanghai 200444,China;College of Advanced Vocational Technical,Shanghai University of Engineering Science,Shanghai 200437,China;School of Vanadium and Titanium,Panzhihua University,Panzhihua 617000,China)

机构地区：[1]上海大学高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海工程技术大学高等职业技术学院,上海200437 [3]攀枝花学院钒钛学院,攀枝花617000

出　　处：《机械工程材料》2022年第9期16-23,共8页Materials For Mechanical Engineering

基　　金：钢铁联合研究基金资助项目(U1860203)。

摘　　要：基于40Cr钢成分,设计出3种成分(质量分数/%)分别为0.35C,0.9Mn,3.5Cr,0.6Si,0.3V,0.05Ti(编号N1),0.35C,1.2Mn,2.0Cr,0.8Si,0.4V,0.11Ti(编号N2)以及0.40C,0.6Mn,3.5Cr,0.8Si,0.1V,0.23Ti(编号为N3)的试验钢,研究了试验钢的显微组织以及在质量分数3.5%NaCl溶液中的电化学性能和耐腐蚀性能。结果表明:N3试验钢的晶粒最细小且马氏体板条束最窄,N1试验钢次之,N2试验钢最大;N1试验钢的开路电位最高,自腐蚀电位最高,自腐蚀电流密度最低,最大相位角绝对值最大,容抗弧半径最大;在NaCl溶液中浸泡24 h后,N1和N3试验钢表面发生局部点蚀,N2试验钢发生均匀腐蚀;N1试验钢中铬含量高,晶粒尺寸适中,表面腐蚀产物致密性最高,耐腐蚀性能最好。Three test steels with composition(mass fraction/%) of 0.35C,0.9Mn, 3.5Cr, 0.6Si, 0.3V, 0.05Ti(namely N1), 0.35C, 1.2Mn, 2.0Cr, 0.8Si, 0.4V, 0.11Ti(namely N2) and 0.40C,0.6Mn, 3.5Cr, 0.8Si, 0.1V, 0.23Ti(namely N3) were designed based on 40Cr steel composition, and the microstructure, electrochemical properties and corrosion resistance in 3.5wt% NaCl solution of test steels were studied. The results show that N3 test steel had the smallest grain size and the narrowest martensite lath bundle, followed by N1 test steel and N2 test steel. N1 test steel had the highest open circuit potential, the highest free-corrosion potential, the lowest freecorrosion current density, the largest absolute value of the maximum phase angle, and the largest radius of the capacitive arc. After soaking in NaCl solution for 24 h, localized pitting corrosion occurred on the surface of N1 and N3 test steel, while uniform corrosion occurred on N2 test steel. N1 test steel had high chromium content, moderate grain size, the highest surface corrosion product compactness and the best corrosion resistance.

关 键 词：中碳合金钢 显微组织 含Cl^(-)环境 耐腐蚀性能 

分 类 号：TG174[金属学及工艺—金属表面处理]