超级13Cr油管钢在不同浓度Cl^-介质中的腐蚀行为  

Corrosion Behaviors of Super 13Cr Tubing Steels in NaCl Solution with Different Concentration

作　　者：王毅飞[1] 谢发勤[2] WANG Yifei;XIE Faqin(Northwest Institute for Nonferrous Metal Research,Xi’an 710016;School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072)

机构地区：[1]西北有色金属研究院,西安710016 [2]西北工业大学航空学院,西安710072

出　　处：《材料导报》2018年第16期2847-2851,共5页Materials Reports

基　　金：陕西省自然科学基础研究计划(2017JM5056)

摘　　要：采用全浸腐蚀实验方法,通过扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射分析(XRD)、失重法、极化曲线等分析手段,对超级13Cr油管钢在不同浓度(5%,15%,25%,35%,质量分数)的NaCl溶液中的腐蚀速率、腐蚀形貌、腐蚀产物及电化学特性进行了分析,研究了Cl^-浓度对其腐蚀行为的影响。结果显示:超级13Cr油管钢在Cl^-浓度低于35%的NaCl溶液中具有较好的耐腐蚀性能,Cl^-浓度对其腐蚀行为有一定程度的影响,随着Cl^-浓度的增大,材料的耐腐蚀性能降低,被腐蚀倾向增大。较高的Cl^-浓度加速了材料表面点蚀的生长,引发局部腐蚀,进而导致全面腐蚀。Cl^-浓度的增大使超级13Cr油管钢的腐蚀速率增大,但随着腐蚀程度的加重,腐蚀产物增厚及覆盖面积增大,阻碍了基体和溶液的接触,从而减缓了腐蚀速率的增速,其腐蚀产物主要是由Fe和Cr的氧化物构成。The corrosion behaviors of super 13Cr tubing steels were investigated by immersion corrosion test in 5%,15%,25%and 35%NaCl solution.The corrosion rate,corrosion morphology,corrosion products and electrochemistry characteristics were analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD),weight loss and polarization.The results showed that super 13Cr tubing steels had better general corrosion resistance properties in NaCl solution with the concentration of Cl^-less than 35%,and the concentration of Cl^-had influences on the corrosion of super 13Cr tubing steels in a certain degree.With the concentration of Cl^-increased,the corrosion resistance properties of super 13Cr tubing steels decreased,while the tendency of corrosion increased.The higher concentration of Cl^-accelerated the growth of pitting on the surface of the super 13Cr tubing steels,that caused localized corrosion,and then resulted in general corrosion.The corrosion rate increased with the increase of Cl^-concentration,but with the corrosion degree aggravated,the corrosion products became thicker and the covering area increased,which isolated the contact between the substrate and the solution,thus slowing down the corrosion rate.The corrosion products consisted of Fe and Cr oxides.

关 键 词：超级13Cr油管钢 CL^-浓度 全浸腐蚀 点蚀 

分 类 号：TG174.2[金属学及工艺—金属表面处理]