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
曾东保 1何毅鹏 2廖文宇3
作者信息
- 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
- 折叠
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.
Abstract
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Key words
high-entropy alloy/cladded coating/surface treatment/laser cladding/CoCrNi/medium-entropy alloy/corrosion resistance/304 stainless steel/automobile material引用本文复制引用
出版年
2024
NETL
NSTL
万方数据