离子渗氮X80管线钢表面的腐蚀行为  

Electrochemical Corrosion Behavior of Plasma Nitridized X80 Pipeline Steel

作　　者：吴新春[1] 陈吉[1] 韩啸[1] 邱辉[2] 

机构地区：[1]辽宁石油化工大学机械工程学院石油化工过程腐蚀与防护技术中心,辽宁抚顺113001 [2]中国石油天然气股份有限公司抚顺石化分公司洗涤剂化工厂,辽宁抚顺113001

出　　处：《材料保护》2014年第4期65-67,8,共3页Materials Protection

基　　金：辽宁省高等学校杰出青年学者成长计划(LJQ2011033);辽宁省自然科学基金项目(No.201202127)资助

摘　　要：随着我国石油、天然气的大力发展,对高级别管线钢的耐蚀性能要求也越来越高。在不同温度下对X80管线钢进行离子渗氮处理,利用D/max-RB型X射线衍射仪、TESCAN VEGA3型扫描电镜观察、动电位极化曲线及阻抗谱测量,对比研究了X80钢及经离子渗氮后在3.5%NaCl溶液中的电化学腐蚀行为。结果表明:当渗氮温度为550℃和600℃时,表层硬度约为X80管线钢的3倍;自腐蚀电流密度和自腐蚀电位显著提高,X80钢经离子渗氮处理后在表面形成了Fe4N层,能显著提高其耐蚀性。X80 pipeline steel was plasma nitrided under different temperatures.The electrochemical corrosion behavior of X80 steel before and after plasma nitriding in 3.5%NaCl solution was comparatively evaluated based on measurements of potentiodynamic polarization curves and alternating current impedance spectra,while an X-ray diffractometer and a scanning electron microscope were performed to analyze the phase composition and morphology of corroded products.Results indicated that after plasma nitriding under 550 ℃ and 600 ℃,resultant nitrided layer exhibited greatly increased hardness which was about 3times as much as the hardness of the pipeline steel,and the corrosion current density and potential were also significantly increased.Plasma nitriding gave rise to Fe_4N layer on the surface of the pipeline steel thereby leading to considerably increased corrosion resistance.

关 键 词：离子渗氮 X80管线钢 耐蚀性 电化学行为 

分 类 号：TG174[金属学及工艺—金属表面处理]