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NiCrN涂层相成分调控及腐蚀磨损机理
作者: 英1  乐2  巫业栋2  林1  飞1  侠1 王启民3 张世宏1 2 
单位:(1. 安徽工业大学现代表界面工程研究中心 安徽 马鞍山 243002 2. 安徽工业大学材料科学与工程学院 安徽 马鞍山 243002 3. 广东工业大学机电工程学院 广州 510006) 
关键词:镍铬氮涂层 电弧离子镀 相成分 腐蚀磨损 
分类号:TG148
出版年,卷(期):页码:2019,47(4):0-0
DOI:
摘要:

 采用电弧离子镀技术在42CrMo钢基体上沉积NiCrN涂层,通过改变N2流量来调控涂层的相成分,并研究其对腐蚀磨损性能的影响规律。研究表明:随着N2流量的增加,CrN相含量增加,金属Ni、Cr相含量相对降低,并导致涂层的硬度由530 HV逐渐升高至710 HV。涂层的腐蚀电位随着CrN相含量增加而逐渐正移,腐蚀电流密度基本维持在同一数量级。在腐蚀磨损的中后期,涂层的失效形式以点蚀为主。随着涂层中CrN相含量增加,涂层的耐点蚀性能变差。最后,详细讨论了涂层的腐蚀磨损机理。

 NiCrN coatings were fabricated on 42CrMo steels via arc ion plating. The phase composition at different nitrogen flowrates was regulated, and the effect of nitrogen flowrate on the corrosive wear performance was also investigated. The results show that the content of CrN phase increases and the amounts of metallic Ni and Cr phases decrease with the increase of nitrogen flowrate, leading to an increase in coating microhardness from 530 HV to 710 HV. The corrosion potential shifts towards the positive direction due to the contribution of CrN phase, while the corrosion current density maintains in the same order of magnitude. In the middle and late periods of the corrosive wear experiments, pitting corrosion is determined as a main failure mode of the coating. The pitting corrosion resistance of the coatings deteriorates when the content of CrN phase increases. In addition, the corrosive wear mechanism was also discussed.

基金项目:
安徽省重点研究和开发计划项目(1804b06020370)。
作者简介:
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