含铬耐候钢在模拟海洋大气环境中的腐蚀行为  

Corrosion Behavior of Cr Bearing Weathering Steel in Simulated Marine Atmosphere

作　　者：张飘飘[1] 杨忠民[1] 陈颖[1] 王慧敏[1] 

机构地区：[1]钢铁研究总院工程用钢所,北京100081

出　　处：《中国腐蚀与防护学报》2017年第2期93-100,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家高技术研究发展计划(2015AA03A502)~~

摘　　要：设计了1Cr-0.5Al-0.3Mo,5Cr-0.4Ni-0.3Cu和10Cr-0.3Ni3种不同成分的实验钢,以20MnSi钢为对比钢种,采用周期浸润加速腐蚀实验、电化学测试方法,结合SEM和XRD等手段研究了实验钢种在模拟海洋大气环境中的腐蚀行为。结果表明:实验钢的腐蚀速率随Cr含量增加而降低,1Cr钢和5Cr钢锈层为双层结构,内锈层为富铬层与贫铬层交替带状结构,10Cr钢表面出现钝化现象;随着腐蚀时间延长,5Cr钢腐蚀率先增加后趋平稳,10Cr钢腐蚀率一直稳定在较低水平,20MnSi钢腐蚀率降低;Cr可提高基体自腐蚀电位和电荷传递电阻,同时增大锈层电阻。Three different low alloy steels 1Cr-0.5AI-0.3Mo, 5Cr-0.4Ni-0.3Cu and 10Cr-0.3Ni were designed, then taking steel 20MnSi as a reference, their corrosion behavior was comparatively investigated in simulated marine atmosphere by means of periodic immersion accelerated corrosion test and electrochemical test, as well as XRD, SEM and EDS etc. In addition, electrochemical performance of the formed rust layer was assessed. The results showed that the corrosion rate of the test steels was de- creased with the increasing Cr content, the formed rusts of the steels with 1% and 5%Cr composed of two layers with an inner layer of alternating band-like structure with Cr enriched sub-layers and Cr deplet- ed sub-layers. While the steel with 10%Cr was passivated during the test. Besides, with the extending corrosion time, the corrosion rate of the steel with 5%Cr firstly increased and then stabilized, but it kept very low level for the steel with 10%Cr, and it decreased for the steel 20MnSi. Cr enhanced the free-cor- rosion potential and charge transfer resistance of the steels, thereby improved the compactness of the formed rusts.

关 键 词：耐候钢 CR含量 耐蚀性 海洋大气环境 

分 类 号：TG174[金属学及工艺—金属表面处理]