多界面CrN/CrAlN涂层在海水环境中的腐蚀磨损性能研究  

Research on Tribocorrosion of Multi-interface CrN/CrAlN Coating in Seawater Environment

作　　者：李文生[1] 孙绪伟 王永欣[2] 李金龙[2] 王春婷[2] 隋永枫[3] 蓝吉兵[3] LI Wen-sheng;SUN Xu-wei;WANG Yong-xin;LI Jin-long;WANG Chun-ting;SUI Yong-feng;LAN Ji-bing(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province,Key Laboratory of Marine Materials and Related Technologies,Ningbo Institute of Materials and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Hangzhou Steam Turbine Power Group Co.,Ltd.,Hangzhou 310022,China)

机构地区：[1]兰州理工大学有色金属先进加工与再利用国家重点实验室,兰州730050 [2]中国科学院宁波材料与工程研究所,中国科学院海洋新材料与应用技术重点实验室,浙江省海洋材料与防护技术重点实验室,浙江宁波315201 [3]杭州汽轮动力集团有限公司,杭州310022

出　　处：《表面技术》2022年第1期69-78,共10页Surface Technology

基　　金：国家重点研发计划资助(2020YFB2010401);浙江省重点研发计划(2020C03102);宁波市科技创新2025重大专项(2018B10028);中国科学院青年创新促进会项目(2018336)。

摘　　要：目的通过多界面结构CrN/CrAlN涂层来提高316不锈钢在海水中的耐腐蚀磨损性能。方法采用多弧离子镀技术在316不锈钢基底表面制备CrAlN单层和CrN/CrAlN多层涂层。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射仪(XRD)等设备表征涂层的微观结构和相组成;借助纳米压痕仪及划痕仪分别测试涂层的硬度和结合强度;通过往复式摩擦磨损试验机及电化学工作站,实时记录涂层在人工海水环境下摩擦系数和电化学信号的连续变化,并采用扫描电子显微镜对磨痕形貌进行分析,评价CrAlN单层和CrN/CrAlN多层涂层在人工海水环境中的腐蚀磨损特性。结果CrN/CrAlN多层涂层结构致密,层间界面清晰,厚度大约在4.12μm,力学性能优异,其硬度高达37.65 GPa。在海水环境中,摩擦系数随外加电位增加而降低,且当外加电位为0.2 V时,最低摩擦系数在0.29左右。而多层涂层损失量变化规律与之相反,当外加电位为–0.6 V时,其具有最低损失量,大约为0.00086 mm^(3)。相比CrAlN单层涂层,CrN/CrAlN多层涂层的腐蚀电流密度降低,损失量显著减小。结论CrN/CrAlN多层涂层具有致密的多界面结构,在海水环境中的耐腐蚀磨损性能更为优异。主要失效机制为磨粒磨损、塑性变形和腐蚀磨损。In order to improve the tribocorrosion resistance of 316 stainless steel in seawater,a protective measure of multi-interface structure CrN/CrAlN coatings was proposed.CrAlN monolayer and CrN/CrAlN multilayer coating were deposited on the surface of 316 stainless steel substrate by using multi-arc ion plating technology,respectively.The microstructure and phase composition of the coatings were characterized by scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffraction(XRD).The hardness and adhesion of the coatings were measured by nanoindentation and scratch tester,respectively.The continuous changes of friction coefficient and electrochemical signals of different coatings in the artificial seawater environment were recorded in real time by reciprocating friction-wear tester associated with electrochemical workstation,and the tribocorrosion characteristics of CrN/CrAlN multilayer coatings in artificial seawater environment were evaluated by analyzing the morphology of the wear scar with scanning electron microscope.The results show that,the CrN/CrAlN multilayer coating shows a compact structure with a thickness of about 4.12μm,where the multilayer interface is clear.The mechanical properties are excellent,and the hardness is as high as 37.65 GPa.In the artificial seawater environment,friction coefficient of the coating decreases with the increase of the applied potential,and when the applied potential is 0.2 V,the lowest friction coefficient is about 0.29,while the change trend of the multilayer coating loss is the opposite.When the applied potential is–0.6 V,its lowest loss is about 0.00086 mm^(3).Compared with CrAlN monolayer,the corrosion current density and the loss of CrN/CrAlN multilayer coating is significantly reduced.The CrN/CrAlN multilayer coating has a dense multi-interface structure,and has better tribocorrosion resistance in seawater environments.Its main failure mechanisms in seawater are abrasive wear,plastic deformation and corrosion wear.

关 键 词：多弧离子镀 CrN/CrAlN多层涂层 腐蚀磨损性能 海水环境 

分 类 号：TG174.4[金属学及工艺—金属表面处理]