摘要
采用高温、高压反应釜和电化学技术对3Cr低合金管线钢及焊接接头的CO2腐蚀行为进行研究.结果表明,3Cr低合金管线钢在高温、高压CO2腐蚀环境中表面生成致密的富Cr腐蚀产物膜,这是其抗CO2腐蚀性能优于X65钢的主要原因.3Cr低合金管线钢焊接接头中母材、热影响区和焊缝的腐蚀产物膜特征相似,结构致密,均存在Cr元素的富集.与X65钢相比,3Cr低合金管线钢的自腐蚀电位较正,自腐蚀电流密度较低.在CO2腐蚀介质中,3Cr低合金管线钢焊接接头的母材区域作为阳极首先发生腐蚀,焊缝和热影响区作为阴极受到保护.
The CO2 corrosion behavior of 3Cr low-alloy pipeline steel and its weld joints were researched with a high-pressure high-temperature autoclave and electrochemical techniques.The results showed that the corrosion product scales enriched Cr element were compact,which is the main reason that the CO2 corrosion resistance of 3Cr low-alloy pipeline steel is superior to that of X65 steel.The product scales of the base metal,heat affected zone （HAZ） and weld metal in 3Cr low alloy pipeline steel weld joints were similar with each other,with Cr enrichment and compact structure.Compared with X65 steel,the corrosion potential of 3Cr low alloy pipeline steel was more positive and the corrosion current density was lower.The base metal of 3Cr low alloy pipeline steel weld joints as an anode would be suffered corrosion firstly,and the weld metal and HAZ of the weld joints as cathodes would be protected.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第3期345-350,共6页
Journal of University of Science and Technology Beijing
基金
北京市自然科学基金重大项目(No.3080001)
