NiCoCrAlY/NiCoCrAlYN涂层的腐蚀磨损行为  

Corrosive Wear Behavior of NiCoCrAlY/NiCoCrAlYN Coatings

作　　者：杨英 刘永康 王芳[1,2] 李乐 陈建军[3] 杨贵春 李伯荣 郑军 YANG Ying;LIU Yong-kang;WANG Fang;LI Le;CHEN Jian-jun;YANG Gui-chun;LI Bo-rong;ZHENG Jun(Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma'anshan 243002,China;School of Material Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China;Shanxi Diesel Engine Industry Co.,Ltd.,Datong 037027,China;Guangdong Zhenhua Technology Co.,Ltd.,Zhaoqing 526040,China)

机构地区：[1]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,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]山西柴油机工业有限责任公司,山西大同037027 [4]广东振华科技股份有限公司,广东肇庆526040

出　　处：《表面技术》2022年第2期284-294,共11页Surface Technology

基　　金：安徽高校协同创新项目(GXXT-2019-016);安徽省重点研究与开发计划(202004a05020038);安徽省高等学校自然科学研究项目(KJ2020A0264);肇庆市西江创新创业团队项目。

摘　　要：目的在中碳钢表面制备金属+氮化物涂层以研究其在腐蚀、磨损耦合环境下的服役行为。方法利用电弧离子镀技术在42CrMo钢基体表面制备NiCoCrAlY/NiCoCrAlYN双层涂层,通过改变氮气流量来调控涂层中氮元素含量。采用显微硬度计以及特制的腐蚀磨损试验机,同时结合XRD、XPS、SEM等各类表征技术研究涂层力学及腐蚀磨损行为。结果NiCoCrAlYN涂层物相主要为γ-Ni、γ'-Ni_(3)Al、fcc-CrN和fcc-AlN。随着N_(2)流量的逐步引入,涂层中CrN/AlN陶瓷相含量增加,显微硬度从575HV_(0.05)逐渐提升至730HV_(0.05),而结合力等级从HF 2下降至HF 3。NiCoCrAlY/NiCoCrAlYN双层涂层比NiCoCrAlY单层涂层具有更佳的腐蚀磨损性能,且随着N含量的增加而显著提升。当N2流量为400 mL/min时,涂层显示出最佳的腐蚀磨损性能。此外,涂层的失效形式也由磨损失效逐渐转变为腐蚀失效。结论由于氮化物表层的高硬度特性增强了涂层耐磨性,NiCoCrAlY-NiCoCrAlYN界面的阻挡作用提高了涂层耐蚀性,加之底部NiCoCrAlY层具有良好的韧性和延展性,三者的综合作用导致NiCoCrAlY/NiCoCrAlYN双层涂层的腐蚀磨损性能优于NiCoCrAlY单层涂层。The work aims to fabricate metal plus nitride hard coatings on medium carbon steel substrates to study the service behaviors under the corrosive wear conditions.NiCoCrAlY/NiCoCrAlYN double layer coatings were fabricated on 42CrMo steel substrates by means of arc ion plating.The nitrogen content was manipulated by varying the nitrogen gas flow.The mechanical and corrosive wear behaviors were studied with microhardness tester and tailored corrosive wear apparatus,in combination with multiple analytical techniques such as XRD,XPS and SEM.The results showed that NiCoCrAlYN coatings were mainly composed ofγ-Ni,γ'-Ni_(3)Al,fcc-CrN and fcc-AlN ceramic phases.With the increase of N_(2) flow rates,the contents of ceramic phases increased,followed by the promotion of the coating micorhardness from 575HV_(0.05) to 730HV_(0.05),as well as the degradation of the coating adhesion from HF 2 to HF 3.Compared with the NiCoCrAlY single layer coating,the NiCoCrAlY/NiCoCrAlYN double layer coatings exhibited better corrosive wear performance,which was increased with the increase of N flow rates.The coating revealed the best corrosive wear resistance when the N_(2) flow rate reached 400 mL/min.Moreover,the failure model of coating also converted from wear failure to corrosion failure.The nitride surface with the virtue of high hardness improves the coating wear resistance,and NiCoCrAlY-NiCoCrAlYN interface increases the coating corrosion resistance as a result of interface barrier effect.In addition,the NiCoCrAlY bottom layer exhibits excellent toughness and malleability.Because of the three effects mentioned above,the corrosive wear resistance of NiCoCrAlY/NiCoCrAlYN double layer coatings is significantly higher than that of NiCoCrAlY single layer coating.

关 键 词：NICOCRALY NiCoCrAlYN 电弧离子镀 腐蚀磨损 

分 类 号：TG147[一般工业技术—材料科学与工程]