Research on Critical Pitting Temperature of Super 13Cr Stainless Steel
- 作者：LIN Guan-faZHANG Guo-chaoHAN YanCAI Rui
- 会议时间：2014-05-01
- 关键词：super 13Cr stainless steel ; critical pitting temperature (CPT) ; Pitting corrosion
- 作者单位：LIN Guan-fa,HAN Yan,CAI Rui(The Key Laboratory for Mechanical and Environmental Behavior of Tubular Goods,CNPC,Xi'an 710077,China)ZHANG Guo-chao(Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji,Shaanxi,721008,China)
- 母体文献：2014油气井管柱与管材国际会议论文集
- 会议名称：2014油气井管柱与管材国际会议
- 会议地点：西安
- 主办单位：中国石油学会
- 语种：chi
摘要
The pitting corrosion behavior of super 13Cr stainless steel was studied by electrochemical test and chemical immersion methods ,and the pitting morphology was investigated by SEM.The results showed that there was a difference of 4℃ in the critical pitting temperatures of the super 13Cr stainless steel determined by electrochemical and chemical immersion methods respectively.Due to the promotion function of strong oxidation of FeCl3 in chemical immersion, chemical immersion appraisal was suitable mainly for comparing the pitting performance of several materials, whereas the electrochemical test could further describe the critical condition of pitting.Unstable pitting with a diameter less than 30μm was formed on material surface just below the CPT,while stable pits could only be formed above the CPT.