纯铁表面三价镀铬/渗氮复合处理制备CrN/Cr2N涂层

材料热处理学报, 2017, 38(5): 129-133. doi: 10.13289/j.issn.1009-6264.2016-X296

纯铁表面三价镀铬/渗氮复合处理制备CrN/Cr2N涂层

焦东玲 ^1, , 黄海滨 ^2, , 丁红珍 ^3, , 邱万奇 ^4,

1.华南理工大学材料科学与工程学院,广东广州,510641

2.华南理工大学材料科学与工程学院,广东广州,510641

3.顺德职业技术学院机电工程学院,广东佛山,528300

4.华南理工大学材料科学与工程学院,广东广州,510641

基金项目: 中央高校基本科研业务费重点项目(2015ZM065) 国家自然科学基金(51271079) 广东省自然科学基金(2016A030313450,2015A030313223)

关键词：氮化铬 , 渗氮 , 镀铬 , CrN , Cr2N

CrN/Cr2N coating prepared by trivalent chromium electroplating and nitriding on pure iron

Keywords： chromium nitrides , nitriding , chromium plating , CrN , Cr2N

采用预三价镀铬再穿透气体渗氮的方法,在纯铁表面制备CrN/Cr2N涂层.研究不同镀铬层厚度、渗氮温度和时间所形成涂层的微观结构和相组成变化规律.随渗氮温度从540℃提高到700℃,镀铬层相结构变化为:Cr→CrN/Cr2N(具有超点阵结构的Cr2N)→CrN/Cr2N.在同一温度(640℃)渗氮,随时间延长,Cr→CrN/Cr2N,形成大量具有超点阵结构的Cr2N相.SEM/EPMA测试结果表明,采用该复合处理制备的氮化铬层与基体间可形成互扩散的冶金结合,实现氮化铬层与基体间在组织结构上的平缓过渡,有利于提高涂层性能.

CrN/Cr2N coating was prepared on the pure iron surface by trivalent chromium electroplating and penetrating nitriding.The transformation of microstructure and phase composition of the coatings was investigated under different plating thickness,nitriding temperature and time.The results show that the phase composition of the coating changes in a sequence of Cr→CrN/Cr2N (with a superlattice structure)→ CrN/Cr2N with the increasing of nitriding temperature from 540 ℃ to 700 ℃.The phase transformation of Cr→CrN/Cr2N happens by nitriding at 640 ℃ with the increasing of time,and a lot of superlattice structure Cr2N phase precipitates.SEM/ EPMA analysis shows that the metallurgical bonding interdiffusion layer is formed between the coating and substrate,which are benefit to improve the coating property effectively.

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