汽车用不锈钢表面激光熔覆CoCrNi中熵合金熔覆层微观组织及耐蚀性研究  

Microstructure and Corrosion Resistance of Laser Cladded Coating of Medium⁃Entropy Alloy CoCrNi on Surface of Stainless Steel for Automobile

作　　者：曾东保 何毅鹏 廖文宇 ZENG Dongbao;HE Yipeng;LIAO Wenyu(Jiangxi Technical College of Manufacturing,Nanchang 330095,Jiangxi,China;School of Mechanical Engineering,University of South China,Hengyang 421001,Hunan,China;SAIC VOLKSWAGEN Automotive Co Ltd,Shanghai 201805,China)

机构地区：[1]江西制造职业技术学院,江西南昌330095 [2]南华大学机械工程学院,湖南衡阳421001 [3]上汽大众汽车有限公司,上海201805

出　　处：《矿冶工程》2024年第3期145-148,155,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51975270)。

摘　　要：为提升车用304不锈钢的表面硬度及耐蚀性,采用激光熔覆技术在304不锈钢表面制备了CoCrNi中熵合金熔覆层,并研究了熔覆层的相组成、元素分布及耐蚀性能。结果表明,CoCrNi中熵合金熔覆层与基体形成了良好的冶金结合,无裂纹、气孔等缺陷;熔覆层由单一FCC相组成,组织为枝晶、枝晶间结构,各元素在熔覆层中均匀分布,无明显偏析现象,Cr元素的均匀分布对提升涂层耐蚀性具有积极作用;CoCrNi中熵合金熔覆层的极化电阻(101.65 kΩ)高于304基体的极化电阻(90.56 kΩ),耐蚀性明显高于304基体。In order to improve surface hardness and corrosion resistance of 304 stainless steel,a medium-entropy alloy(CoCrNi)coating was prepared on the surface of 304 stainless steel by laser cladding,and phase composition,element distribution and corrosion resistance of the cladded coating were studied.The results show that the treatment has achieved good metallurgical bonding between the cladded CoCrNi coating and the substrate,with no cracks,pores and other defects.The cladded coating is composed of single FCC phase,and exhibits dendrite and inter-dendrite structure.The elements are uniformly distributed on the cladded coating without obvious segregation.The uniform distribution of Cr element plays a positive role in improving corrosion resistance of the coating.The CoCrNi coating has its polarization resistance(101.65 kΩ)higher than that of 304 substrate(90.56 kΩ),and also significantly higher corrosion resistance.

关 键 词：高熵合金 熔覆层 表面处理 激光熔覆 CoCrNi 中熵合金 耐蚀性 304不锈钢 汽车用材料 

分 类 号：TB302[一般工业技术—材料科学与工程]