CAJ | 학술논문

利用美国CORTEST公司高温高压反应釜模拟高含S油气田H2S/CO2腐蚀环境，在流动高矿化度饱和H2S/CO2介质中进行试验，辅以SEM、 XRD、动电位扫描及交流阻抗等表面分析和电化学技术，探讨了油管钢在高温高压H2S/CO2环境中的二次腐蚀行为。结果表明，普通N80油管钢单一CO2腐蚀速率较高，为1.89 mm/a；先CO2腐蚀后H2S腐蚀，腐蚀速率减小为1.38 mm/a，材料的腐蚀类型表现出严重的局部腐蚀，先生成的FeCO3膜转变为FeS膜，转变过程中腐蚀产物膜的晶格发生畸变，导致腐蚀产物膜分层、疏松且容易脱落；先H2S腐蚀后再CO2腐蚀，腐蚀速率明显减小至0.27 mm/a，腐蚀产物膜未发生转变，通过腐蚀产物膜电化学测试分析， FeCO3膜对基体的保护性差，而FeS膜对基体的保护性相对较好。
이용미국CORTEST공사고온고압반응부모의고함S유기전H2S/CO2부식배경，재류동고광화도포화H2S/CO2개질중진행시험，보이SEM、 XRD、동전위소묘급교류조항등표면분석화전화학기술，탐토료유관강재고온고압H2S/CO2배경중적이차부식행위。결과표명，보통N80유관강단일CO2부식속솔교고，위1.89 mm/a；선CO2부식후H2S부식，부식속솔감소위1.38 mm/a，재료적부식류형표현출엄중적국부부식，선생성적FeCO3막전변위FeS막，전변과정중부식산물막적정격발생기변，도치부식산물막분층、소송차용역탈락；선H2S부식후재CO2부식，부식속솔명현감소지0.27 mm/a，부식산물막미발생전변，통과부식산물막전화학측시분석， FeCO3막대기체적보호성차，이FeS막대기체적보호성상대교호。
H2S/CO2 corrosion environments in oil and gas field containing rich S were simulated in a high temperature and high pressure autoclave manufactured by USA Cortest Company,and tests were conducted in flowing medium with high salinity. Second corrosion behavior of oil tube steel in high temperature and high pressure H2S/CO2 corrosion environments was analyzed and discussed by the following technologies,such as SEM,XRD,dynamic potential scanning,AC impedance and electrochemical techniques. The results showed that corrosion rate of N80 oil tube steel was very high,up to 1.89 mm/a. when solution immersion environment contain only CO2. If H2S corrosion was conducted after CO2 corrosion, the corrosion rate reduced to 1.38 mm/a. The corrosion type showed distinct characteristic of local corrosion. FeCO3 corrosion film formed firstly would be transformed to FeS film,in this process,aberration of crystal lattice happened,which would result in delamination and loosen of film. If CO2 corrosion was conducted after H2S corrosion, the corrosion rate decreased a lot,up to 0.27 mm/a, FeS film formed firstly would not transformed. Through electrochemical test and analysis ,the corrosion product film FeS has a good protect to substrate,while FeCO3 film is poor.