摘要
在高温高压高矿化度环境中,通过60 d腐蚀浸泡试验结合扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)等研究了含Cr低合金钢(Cr质量分数为1%~5%)腐蚀产物膜的特性及其对应的腐蚀行为。结果显示:随着Cr含量的提高,低合金钢的均匀腐蚀与局部腐蚀速率均呈现下降趋势,其中均匀腐蚀速率在添加3%Cr后下降至0.026 mm/a以下,局部腐蚀敏感性随着Cr含量的增加显著降低;Cr含量对于低合金钢耐蚀性的影响源于腐蚀产物膜结构与成分的改变,随着基体中Cr含量的增加,以沉积产物为主的腐蚀产物膜由碳酸亚铁钙复盐转变为以碳酸亚铁为主的结构,溶液中Ca^(2+)离子对产物膜的影响降低。
The characteristics and corrosion behavior of the corrosion product films of low alloy steels with Cr mass fraction from 1% to 5% were studied in a high temperature, high pressure and high salinity environment by 60 d corrosion immersion experiment in combination with scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD). The results show that with the increase of Cr content, the uniform corrosion rate and localized corrosion rate of the low alloy steels decreased. The uniform corrosion rate decreased to less than 0.026 mm/a when 3% Cr was added. The localized corrosion sensitivity decreased significantly with the increase of Cr content. The effect of Cr content on corrosion behavior was due to the change of structure and composition of the corrosion product films. With the increase of Cr content in matrix, the corrosion product films mainly composed of deposition products changed from calcium-ferrous carbonate salt to the structure mainly composed of ferrous carbonate, and the effect of Ca^(2+) ions in solution on the product films decreased.
作者
黄熠
马磊
许发宾
邓文彪
徐靖
杨仲涵
岳小琪
张雷
HUANG Yi;MA Lei;XU Fabin;DENG Wenbiao;XU Jing;YANG Zhonghan;YUE Xiaoqi;ZHANG Lei(CNOOC(China)Company Limited Zhanjiang Branch,Zhanjiang 524000,China;Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《腐蚀与防护》
CAS
北大核心
2022年第1期38-43,共6页
Corrosion & Protection
关键词
低合金钢
长周期腐蚀浸泡试验
碳酸亚铁钙复盐
腐蚀速率
low alloy steel
long period corrosion immersion test
calcium-ferrous carbonate
corrosion rate
