摘要
通过模拟油田超深超高压高温油气井腐蚀环境,研究超级13Cr马氏体不锈钢管材抗均匀腐蚀、点蚀及电偶腐蚀性能。结果表明:随着Cl-浓度的增加,超级13Cr马氏体不锈钢的均匀腐蚀速率在气相腐蚀环境中逐渐增大,在液相中变化不大,且气相的均匀腐蚀速率要大于液相的腐蚀速率。但不论在液相还是在气相腐蚀条件下,均匀腐蚀速率均远小于0.1 mm/a,局部腐蚀严重。在温度为150℃的气相环境中,超级13Cr钢的最大局部腐蚀速率可达2.1379 mm/a,其7天实验的最大局部腐蚀坑深度可达41μm。在电偶腐蚀试验中,不论是小试样模拟试验还是实物试验,P110作为阳极,腐蚀加剧,腐蚀速率增大,在电偶处发生明显局部腐蚀。超级13Cr马氏体不锈钢作为阴极被保护,腐蚀减缓,腐蚀速率减小。
By simulating ultra-deep,ultra-high pressure and high temperature oil and gas corrosion environment,the performance of super 13%Cr martensite stainless tubular goods against uniform corrosion,pitting and galvanic corrosion was studied.The results indicate that the uniform corrosion rate of super 13%Cr martensite stainless steel increases as the Cl-concentration increasing in gas phase,and changes little in the liquid phase.The uniform corrosion rate of gas phase is higher than one of the liquid phase.However,the uniform corrosion rate is far less than 0.1mm/a,regardless of corrosion conditions of liquid phase and gas phase,and the localized corrosion is very severe.At 150 ℃ gas environment,the maximum local corrosion rate is up to 2.1379 mm/a,the maximum local corrosion pit depth is up to 41 μm in the experiment of seven days.In the galvanic corrosion test,whether they are small sample simulation test or physical test,the corrosion rate of P110 increases,which is used as an anode,it has local corrosion dramatically in the contact point.The super 13%Cr martensite stainless steel used as the cathode is protected,the corrosion decreases,and the corrosion rate decreases too.
出处
《热加工工艺》
CSCD
北大核心
2012年第10期71-75,共5页
Hot Working Technology
关键词
超级13Cr马氏体不锈钢
均匀腐蚀
点蚀
电偶腐蚀
super 13%Cr martensite stainless steel
uniform corrosion
pitting
galvanic corrosion
