304不锈钢表面硼化物熔覆层的耐腐蚀性能研究  

Corrosion Resistance of Boride Cladding Layer on Surface of 304 Stainless Steel

作　　者：郑世恩 潘应君[1] 张恒 柯德庆[1] 杨岭 朱星宇 ZHENG Shien;PAN Yingjun;ZHANG Heng;KE Deqing;YANG Ling;ZHU Xingyu(College of Science and Metallurgical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Wuhan Chunhe Technology Co,Ltd.,Wuhan 430223,China)

机构地区：[1]武汉科技大学材料与冶金学院,武汉430081 [2]武汉春禾科技有限公司,武汉430223

出　　处：《中国腐蚀与防护学报》2021年第6期843-848,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：武汉科技大学省部共建耐火材料与冶金国家重点实验室青年资金(2018QN04);武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室开放基金(FMRUlab17-7)。

摘　　要：采用等离子熔覆技术在304不锈钢表面制备一层三元硼化物金属陶瓷覆层。通过光学显微镜、X射线衍射和扫描电镜对熔覆层微观结构和相组成进行了表征,利用显微硬度计测试了熔覆层的硬度分布,并对熔覆层的耐蚀性进行了研究。结果表明:硼化物熔覆层与304不锈钢界面处没有宏观裂纹、孔洞等缺陷,形成冶金结合;熔覆层平均显微硬度为630.4 HV_(0.5),约是304不锈钢(HV_(0.5)≤200)的3倍,有效提高了304不锈钢表面硬度;304不锈钢和熔覆层在10%HNO_(3)+3%HF酸性溶液中浸泡48 h后,两者的最大腐蚀深度分别为77和9μm,即熔覆层耐腐蚀性能优于304不锈钢。A ternary boride cermet coating was prepared on 304 stainless steel by plasma cladding technique. The microstructure and phase composition of the cladding layer were characterized by optical microscope, scanning electron microscope and X-ray diffraction. The hardness distribution of the cladding layer was measured with a micro-hardness tester, and the corrosion resistance of the cladding layer was also studied. The results showed that the boride cladding layer forms a good metallurgical bond with the 304 stainless steel, and no defects such as macro cracks and holes were found at the interface. The average microhardness of the cladding layer was 630.4 HV_(0.5), which was three times higher than 304 stainless steel(HV_(0.5)≤200), effectively improving the surface hardness of 304 stainless steel. After immersion test in 10%HNO_(3)+3%HF acidic solution for 48 h, the maximum corrosion depth ratio of the bare 304 stainless steel and the cladding layer is 77 and 9 μm respectively, so the corrosion resistance of the cladding layer is better than that of 304 stainless steel.

关 键 词：304不锈钢 等离子熔覆 硼化物覆层 耐腐蚀性 硬度 

分 类 号：TG174[金属学及工艺—金属表面处理]