燕山大学学报2025，Vol.49Issue(6)：552-560,9.DOI:10.3969/j.issn.1007-791X.2025.06.010
压力气体氮化42CrMo钢渗层组织与耐蚀性研究
Study on microstructure and corrosion resistance of 42CrMo steel permeated by pressure gas nitriding
摘要
Abstract
The application of pressure gas nitriding technology to 42CrMo steel resulted in a notable enhancement in surface hardness following the short-time nitriding process.Additionally,the corrosion resistance of 42CrMo steel was markedly elevated.A scanning electron microscope,microhardness tester,X-ray diffraction apparatus,salt spray test chamber and electrochemical workstation were employed to examine and evaluate the microstructure,hardness,physical phase composition and corrosion resistance of the surface of 42CrMo steel following nitriding.The results demonstrated that the surface nitriding of 42CrMo steel could be achieved in a relatively short time under the conditions of 510℃and 0.3 MPa ammonia gas.The surface hardness of the nitrided specimens reached up to 810 HV0.3,which was significantly improved compared with the original hardness(330～350 HV0.3).The hardness and nitrogen content exhibited a gradual decrease with increasing depth.The nitriding specimen surface forms a substantial number of nitrides,which are primarily Fe2～3 N,Cr2 N,and Fe4 N.Electrochemical testing reveals that the self-corrosion current of the nitriding steel is smaller in comparison to that of the nitriding steel.The corrosion potential is greater,and the salt spray test indicates that the surface pitting density and corrosion product thickness of the nitriding steel are lower than those of the nitriding steel.This suggests that the introduction of the N element enhances the corrosion resistance of 42CrMo steel.The findings of this study provide technical support for the utilisation of 42CrMo steel in enhanced service environments and extended service lives.关键词
42CrMo钢/腐蚀/气体氮化/电化学腐蚀/增压渗氮Key words
42CrMo steel/corrosion/gas nitriding/electrochemical corrosion/pressurised nitriding分类
矿业与冶金引用本文复制引用
李德斌,刘大勇,王一民,丁彦超,张鹏,傅万堂,吕知清..压力气体氮化42CrMo钢渗层组织与耐蚀性研究[J].燕山大学学报,2025,49(6):552-560,9.基金项目
河北省高端钢铁冶金联合基金资助项目(E2020203195) （E2020203195）
上海大件热制造工程技术研究中心资助项目(18DZ2253400) （18DZ2253400）
河北省创新能力提升计划项目(22567609H) （22567609H）
