稀土铈盐钝化对X70碳钢大气腐蚀行为的影响  

Effect of Rare Earth Cerium Salt Passivation on the Atmospheric Corrosion Behavior of X70 Carbon Steel

作　　者：刘榛 李顺灵 普晓玲 张思雨 杨江平 高小倩 屈庆[2] LIU Zhen;LI Shun-ling;PU Xiao-ling;ZHANG Si-yu;YANG Jiang-ping;GAO Xiao-qian;QU Qing(School of Chemical Science and Technology,Kunming 650091,China;Department of Chemistry,Yunnan University,Kunming 650091,China)

机构地区：[1]云南大学化学科学与工程学院,云南昆明650091 [2]云南大学化学系,云南昆明650091

出　　处：《材料保护》2021年第10期24-28,共5页Materials Protection

基　　金：国家自然科学基金项目(51661033,51361028,5116102,31660538);云南大学大学生创新创业训练项目(201810673084)资助。

摘　　要：针对稀土铈盐钝化在大气环境中的腐蚀影响,采用失重法、电化学阻抗谱(EIS)、动电位极化曲线(DP)测试以及扫描电子显微镜(SEM)、能谱仪(EDS)观察等研究了X70碳钢表面不同浓度稀土铈盐制得的转化膜的大气腐蚀行为。结果表明:适当的铈盐钝化可以有效提高X70碳钢的腐蚀电位,降低腐蚀电流密度,增大容抗弧半径,提高耐大气腐蚀性能;当稀土铈盐浓度为0.09 g/L时,X70碳钢的耐大气腐蚀效率最高为62.3%,原因在于适量的稀土铈盐可以增加钝化膜的致密性,形成自愈性修复及大量消耗腐蚀阴极区的氧气。Aiming at the corrosive effect of rare earth cerium salt passivation in atmospheric environment,the atmospheric corrosion behavior of conversion coatings prepared by different concentration rare earth cerium salt on X70 carbon steel’s surface was studied by means of weightlessness method,electrochemical impedance spectroscopy(EIS),dynamic potential polarization curve(DP),scanning electron microscope(SEM)and energy spectrometer(EDS)observation.Results showed that the properly cerium salt passivation could effectively improve the corrosion electric potential,reduce the corrosion current density,increase the arc radius of capacitive resistance,and increase the atmospheric corrosion resistance of X70 carbon steel.Furthermore,there was the highest atmospheric corrosion resistance efficiency of X70 carbon steel about 62.3%when rare earth cerium salt concentration was 0.09 g/L.The reason was that the appropriate earth cerium salt addition could increase the densification of passivated film,which formed self-healing repair and consumed a large amount of oxygen in corrosion cathode area.

关 键 词：稀土铈盐钝化 X70碳钢 大气腐蚀行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理]