NC30Fe合金在氯化钠溶液中的微动腐蚀特性  

Fretting corrosion characteristics of NC30Fe alloy in a sodium chloride solution

作　　者：李放[1] 任平弟[1] 张晓宇[1] 向红先 任思聪[1] 蔡振兵[1] 

机构地区：[1]西南交通大学机械工程学院摩擦学研究所,成都610031

出　　处：《工程科学学报》2015年第10期1344-1349,共6页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51075324)

摘　　要：在PLINT微动磨损试验机上附加电化学测试系统,采用十字交叉接触方式,位移幅值为100μm,法向载荷20、50和80 N条件下,研究NC30Fe合金传热管在氯化钠溶液中的微动腐蚀行为.使用电化学工作站记录微动腐蚀过程中开路电位变化,运用电位扫描法测量微动过程的极化曲线;采用扫描电子显微镜观察磨痕的表面形貌,光学轮廓仪测定磨痕的三维形貌及磨损量.微动磨损使损伤区域金属原子活性增大,腐蚀倾向增大,加速了NC30Fe合金的腐蚀.在氯化钠溶液中,NC30Fe合金由于微动磨损过程产生腐蚀产物膜起到润滑减摩作用,摩擦系数较纯水中降低;但因腐蚀与磨损的交互作用,在氯化钠溶液中的磨损量比纯水中高.氯化钠溶液中的磨损机制主要表现为磨粒磨损和剥层的共同作用.By adding an electrochemical test system on a PLINT fretting wear test machine,the fretting corrosion behavior of an NC30 Fe heat transfer tube in a sodium chloride solution was investigated using cross-contacting configuration under different loading conditions,i. e.,three different normal loads of 20,50 and 80 N with a 100 μm reciprocating amplitude. An electrochemical workstation was used to record the open circuit potential during the fretting corrosion process,and the polarization curves were measured by the potential scanning method. The morphology of wear scars was observed by scanning electron microscopy. The 3D morphology and wear volume loss were determined by optical profilometry. It is found that metal atoms in the worn area are more active and more prone to corrosion because of fretting motion,leading to accelerated corrosion of NC30 Fe alloy. As a result of lubrication action by the corrosion product film,the friction coefficient in the sodium chloride solution is smaller than that in pure water. However,the wear volume loss in the sodium chloride solution is greater than that in pure water due to the interaction of corrosion and wear. Abrasive wear and delamination are considered to be the main wear mechanism in the sodium chloride solution.

关 键 词：镍铬铁合金 氯化钠溶液 微动腐蚀 腐蚀特性 极化曲线 交互作用 

分 类 号：TG146.15[一般工业技术—材料科学与工程]