对AISI420不锈钢进行低温等离子体渗氮处理,采用金相观察、X射线分析等手段对渗层组织结构进行表征,利用显微硬度仪以及腐蚀极化曲线等对渗层硬度和耐蚀性能进行测试.结果表明,不锈钢表面渗层组织均匀,渗层厚度随着温度和时间的增加而增加,渗层表面主要由Fe4N和少量的过饱和含氮α相组成.渗氮后,不锈钢硬度明显增加,且随着时间的延长,渗层硬度升高;渗氮4h和8h后的试样耐蚀性均略有下降,但处理12h后的试样耐蚀性升高,且经渗氮处理后,不锈钢表面形成钝化膜的半导体特性由未处理不锈钢的p型转变为n型.
Low-temperature plasma nitriding treatment was carried out on AISI420 stainless steel surface.Microstructure,hardness and corrosion resistance of the nitrided layer were studied by means of metallography,X-Ray diffraction,Vickers hardness test and corrosion polarization curves.The results show that the nitrided layer is well-formed,the layer thickness increases with the increasing of nitriding temperature and time.The layer mainly consists of Fe4N and "expanded"α with nitrogen phase.Hardness of the layer increases obviously and increases with the increasing of nitriding time.Compared with untreated samples,the corrosion resistances of the samples nitrided for 4 h and 8 h decrease,while that of the sample nitrided for 12 h increases.The semiconductor features of passivation film on stainless steel sample change from type p to type n after plasma nitriding.
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