摘要
利用淬火-抛光-淬火(QPQ)技术对316L钢进行表面改性处理,研究了不同的盐浴渗氮温度下QPQ处理对316L钢微观结构及腐蚀磨损性能的影响,并选出最优的处理温度。利用SEM、EDS、XRD分别对316L钢QPQ处理后渗层微观形貌、组织成分、物相组成进行测试,利用显微硬度计、MFT-R4000摩擦磨损试验机和PGSTAT302N电化学工作站分别测试了316L钢QPQ处理后渗层的硬度、耐磨性及抗蚀性。结果表明:经过570℃×180 min的QPQ氮化处理后,316L钢表面形成Fe3O4、CrN、Fe2N、Fe3N组成的复合渗层,渗层表面硬度可达1111HV2,较316L基体提高约3.4倍。此外,在3.5%(质量分数)NaCl介质下渗层的摩擦系数较316L钢下降约42%,自腐蚀电位由-0.483 V提高到-0.221 V。上述研究表明,QPQ处理后可显著提高316L钢的耐蚀性、耐磨性,为奥氏体不锈钢的QPQ技术强化处理提供了参考。
The surface modification of 316 L steel was carried out by QPQ salt-bath processes at different salt bath nitriding temperatures,and then the effect of QPQ treatment on the microstructure and corrosion wear properties of 316 L steel were studied by means of microhardness tester,MFT-R4000 friction and wear tester and PGSTAT302 N electrochemical workstation,as well as SEM,EDS and XRD,and finally the optimal treatment temperature was acquired.The results show that after nitriding at 570℃×180 min,the surface of 316 L steel forms a composite layer composed of Fe3 O4,CrN,Fe2 N and Fe3 N.The surface hardness of the layer can reach 1111 HV2,which is about 3.4 times higher than that of 316 L matrix.In addition,the friction coefficient of the layer in 3.5%(mass fraction)NaCl solution is about 42%lower than that of 316 L steel,correspondingly,the free-corrosion potential increased from-0.483 V to-0.221 V.The above research shows that corrosion resistance and wear resistance of 316 L steel can be significantly improved after the QPQ treatment,and which proved clearly the QPQ salt-bath technique as an effective means for strengthening the austenitic stainless steel.
作者
张哲鹏
胡鹏程
陈树
杜双明
刘二勇
ZHANG Zhepeng;HU Pengcheng;CHEN Shu;DU Shuangming;LIU Eryong(School of Material Science and Engineering,Xi’an University of Science and Technology,Xi'an 710054,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2020年第5期479-484,共6页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51705415)
陕西省自然科学基础研究计划(2018JM5072)
中科院海洋新材料与应用技术重点实验室开放课题(2018K01).
关键词
QPQ处理
316L钢
微观组织
耐蚀性
耐磨蚀性
QPQ treatment
316L steel
microstructure
corrosion resistance
corrosion-erosion resistance
