含铜低合金耐磨钢在盐雾环境中的腐蚀行为  

Corrosion Behavior of Cu Bearing Low Alloy Wear-resistant Steel in Salt Spray Environment

作　　者：郑爱琴 宋新莉[1] 曹宇[1] 马玉喜[1] 孙新军[2] 梁小凯[2] ZHENG Aiqin;SONG Xinli;CAO Yu;MA Yuxi;SUN Xinjun;LIANG Xiaokai(State Key Laboratory of Refractory Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Department of Structural Steels Central,Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]武汉科技大学耐火材料与冶金国家重点实验室,武汉430081 [2]钢铁研究总院工程用钢研究所,北京100081

出　　处：《腐蚀科学与防护技术》2019年第3期279-284,共6页Corrosion Science and Protection Technology

基　　金：国家重点研发计划(2017YFB0305100)~~

摘　　要：对含铜和不含铜实验钢在中性盐雾试验箱中连续喷雾120、240、480和720 h,研究了在盐雾环境下Cu对低合金耐磨钢耐腐蚀性能的影响规律,通过失重法计算腐蚀速率,并利用XRD和SEM对腐蚀产物进行表征,利用动电位扫描、电化学阻抗谱(EIS)对比分析Cu在低合金耐磨钢腐蚀过程中起到的作用。结果表明:低合金耐磨钢的腐蚀产物主要包括γ-FeOOH、α-FeOOH、Fe3O4、γ-Fe2O3,前期腐蚀产物疏松多孔,后期产物致密难剥落,腐蚀速率先升高后下降,含铜实验钢的腐蚀速率明显低于不含铜实验钢,添加Cu后,实验钢的自腐蚀电位上升,阻抗谱容抗弧增大,电荷转移难度增加,说明Cu能有效降低实验钢腐蚀速率,增强其耐腐蚀性能。The effect of Cu on the corrosion resistance of low alloy wear-resistant steel in neutral salt spray environment was studied for 120, 240, 480 and 720 h respectively in salt spray test chamber. The corrosion rate was calculated by mass loss method, and the corrosion products were characterized by XRD and SEM. The effect of Cu on the corrosion process of low alloy wear-resistant steel was assessed by potentiodynamic measurement and electrochemical impedance spectroscopy(EIS). Results show that the corrosion product of low alloy wear-resistant steel composed mainly of γ-FeOOH, α-FeOOH,Fe3O4, γ-Fe2O3. The corrosion product in the early stage is loose and porous, but became better adhesive in the late stage. The corrosion rate of Cu bearing steels increases first and then decreases, however which is significantly lower than that of Cu-free steel. With the addition of Cu, the free-corrosion potential of the Cu-bearing steel increases, correspondingly, the electrochemical impedance, the capacitive arc on impedance spectra, and the charge transfer resistance are obviously enhanced, indicating that Cu can effectively enhance the corrosion resistance of the steel.

关 键 词：CU 低合金耐磨钢 耐腐蚀性能 盐雾实验 电化学分析 

分 类 号：TG162[金属学及工艺—热处理]