N80钢表面碳、氮、氧、铬共渗层的组织和耐腐蚀性能  

Microstructure and Corrosion Resistance of C-N-O-Cr Co-Penetrated Layer on N80 Steel Surface

作　　者：王小红[1] 闫静[2] 陈小时 任呈强[1] 黄本生[1] 

机构地区：[1]西南石油大学材料科学与工程学院,成都610500 [2]西南油气田分公司石油装备制造公司,成都610051 [3]中国石油西部管道股份有限公司,乌鲁木齐810012

出　　处：《机械工程材料》2010年第9期54-56,共3页Materials For Mechanical Engineering

基　　金：西南石油大学校基金资助项目(05GG009-020-01)

摘　　要：采用低温气体多元共渗技术在N80钢表面制备了碳、氮、氧、铬共渗层,采用SEM、EDS等分析了渗层形貌、厚度及共渗元素的分布;采用XRD测定了共渗层的相组成;在饱和CO_2模拟油田介质中测试了共渗层的极化曲线与渗层的腐蚀速率。结果表明:渗层厚约70μm,由靠近基体含有大量Cr-O相约40μm厚的氧化物层、紧邻氧化物层含有ε、γ′相约15μm厚的氮化物层及最外层的铁氧化物层组成;碳、氮、氧、铬共渗层自腐蚀电位比基体正移320 mV,在饱和CO_2模拟油田介质中腐蚀速率仅为基体的1/3。Using low temperature gas multi-component co-penetrated technique,C-N-O-Cr co-penetrated layer was obtained on the surface of N80 steel.The phase composition,morphology,thickness and the distribution of the co-penetrated elements of the co-penetrated layer were investigated by means of XRD,SEM and EDS.The polarization curve and the corrosion rate of the penetrated layer in the simulated saturated oilfield brine with carbon dioxide were tested.The results show that the thickness of the penetrated layer was about 70μm.And the layer was composed of the 40μm oxide layer with many Cr-O phase around the substrate,15μm nitride layer withεphase andγ＇ phase near the oxide layer and the outmost iron oxide layer.To compare with the substrate,the corrosion potential of the C-N-O-Cr penetrated layer increased 320 mV in positive direction,the corrosion rate in the simulated saturated oilfield brine with carbon dioxide was only one-third of that of the substrate sample.

关 键 词：N80钢 碳、氮、氧、铬共渗层 组织 耐蚀性 

分 类 号：TG161.8[金属学及工艺—热处理]