摘要
采用激光熔覆技术在20Cr13基体表面制备M2涂层,利用超景深显微镜、光学显微镜、XRD以及维氏硬度仪对M2涂层的宏观形貌、微观组织、物相组成和显微硬度进行分析,利用电化学工作站测量M2涂层和20Cr13基体的Tafel曲线以及腐蚀形式。研究结果表明:涂层的主相是α-Fe和碳化物硬质相(M_(23)C_(6)和M_(7)C_(3)),与基体形成良好冶金结合。涂层的硬度均值在729.5 HV,是基体硬度均值的3.8倍。基体的自腐蚀电位最大,自腐蚀电流密度最小,涂层的耐腐蚀性比基体的差;涂层的腐蚀形式以点蚀和晶间腐蚀为主,基体以孔蚀和晶间腐蚀为主。
M2 coating was prepared on the surface of 20Cr13 substrate by laser cladding technology.The macro-morphology,microstructure,phase composition and microhardness of the M2 coating were analyzed by ultra-depth microscope,optical microscope,XRD and Vickers hardness tester.The Tafel curves and corrosion forms of the M2 coating and 20Cr13 substrate were measured by electrochemical workstation.The results show that the main phases of the coating areα-Fe and carbide hard phases(M_(23)C_(6) and M_(7)C_(3)),forming good metallurgical bonding with the substrate.The average hardness of the coating is 729.5 HV,which is 3.8 times of the average hardness of the substrate.The self-corrosion potential of the substrate is largest and the self-corrosion current density is smallest,and the corrosion resistance of the coating is worse than that of substrate.The corrosion form of the cladding layer is mainly pitting and intergranular corrosion,and the substrate is mainly hole and intergranular corrosion.
作者
张文平
杜彦斌
何国华
胡言峰
舒林森
ZHANG Wenping;DU Yanbin;HE Guohua;HU Yanfeng;SHU Linsen(Chongqing Key Laboratory of Manufacturing Equipment Mechanism Design and Control,Chongqing Technology and Business University,Chongqing 400067,China;Shaanxi Key Laboratory of Industrial Automation,Shaanxi University of Technology,Hanzhong 723001,China)
出处
《热加工工艺》
北大核心
2024年第18期148-154,共7页
Hot Working Technology
基金
重庆市自然科学基金创新发展联合基金(市教委)(CSTB2022NSCQ-LZX0011)
重庆市高校创新研究群体资助项目(CXQT21024)
重庆英才计划“包干制项目”(cstc2022ycjh-bgzxm0056)
重庆英才计划(CQYC20210302226)。
