0Cr18Ni9钢表面等离子铌合金化及改性层抗晶间腐蚀性能的研究  

Study on Plasma Niobium Surface Alloying of 0Cr18Ni9 Steel and Intergranular Corrosion Resistance Property of Alloyed Layer

作　　者：谢燕翔[1] 刘俊[1] 王振霞[1] 贺志勇[1] 

机构地区：[1]太原理工大学表面工程研究所,山西太原030024

出　　处：《热加工工艺》2009年第4期71-73,77,共4页Hot Working Technology

基　　金：太原理工大学校青年基金资助项目;太原市科技项目大学生创新创业专项(08122087)

摘　　要：采用双辉等离子渗金属技术在0Cr18Ni9奥氏体不锈钢表面形成厚22μm、均匀致密连续的渗铌合金层。用不锈钢10%草酸侵蚀试验方法对未渗铌和渗铌的0Cr18Ni9不锈钢试样的抗晶间腐蚀性能进行了对比;采用XRD对试样的相组成进行分析。结果表明,未渗铌0Cr18Ni9不锈钢呈现三类的沟状晶间腐蚀,而渗铌处理后的0Cr18Ni9不锈钢几乎没有发生晶间腐蚀;渗铌处理后的试样中形成了铌的碳化物NbC和Nb6C5,因此减少了Cr23C6的形成,提高了0Cr18Ni9的耐晶间腐蚀性能。A continuous and compact niobium modified surface alloying layer was prepared on 0Cr18Ni9 austenitic stainless steel substrate using double-glow plasma surface alloying technology and the depth of modified layer is about 22 μm. The intergranular corrosion resistance behavior of the modified layer was studied and compared with the untreated 0Cr18Ni9 surface by the method of 10% oxalic acid corrosion test. The phase composition of the sample was analyzed by XRD. The results show that the untreated 0Cr18Ni9 stainless steel shows three kinds of gully intergranular corrosion, while almost no intergranular corrosion takes place on the niobium alloying layer. The XRD shows that the NbC and Nb6C5 form within the niobium alloyed layer, which reduces the precipitation of Cr23C6, and enhances the intergranular corrosion resistance property.

关 键 词：奥氏体不锈钢 双辉等离子渗金属 渗铌合金层 晶间腐蚀 

分 类 号：TG156.8[金属学及工艺—热处理]