低温低压电弧等离子体渗氮处理316不锈钢的耐腐蚀性能

发布时间：2018-03-14 18:16

  本文选题：材料失效与保护　切入点：低压电弧等离子体渗氮　出处：《材料研究学报》2017年02期 　论文类型：期刊论文

【摘要】：在低温下对316奥氏体不锈钢进行低压电弧等离子体渗氮处理,研究了渗氮处理对不锈钢耐腐蚀性能的影响。结果表明:渗氮层有两个子层,由纳米晶扩张奥氏体和少量的Cr N化合物组成的外表层和单一结构的扩张奥氏体内层。由于低压电弧等离子体浓度高,在400℃渗氮1 h得到的渗氮层厚度达到15μm,表现出很高的渗氮速率。纳米晶外表层是渗氮不锈钢耐腐蚀性能的关键,促进了钝化膜的生成,渗氮后试样表面形成的钝化膜厚度达到27 nm,比原始不锈钢钝化膜的2倍还多。渗氮不锈钢试样的腐蚀电流(3.55×10~(-8)A/cm~2)比基材的腐蚀电流(1.99×10~(-7)A/cm~2)降低一个数量级,表明渗氮后试样的耐腐蚀性能提高了。
[Abstract]:Low pressure arc plasma nitriding treatment was carried out on 316 austenitic stainless steel at low temperature. The effect of nitriding treatment on corrosion resistance of 316 austenitic stainless steel was studied. The results show that the nitriding layer has two sub-layers. The outer layer consisting of nanocrystalline expanded austenite and a small amount of Cr N compounds and the inner layer of expanded austenite with a single structure. Due to the high concentration of low pressure arc plasma, The nitriding layer thickness reached 15 渭 m at 400 鈩，

本文编号：1612374