H2S分压对SM 80SS套管钢在CO2/H2S共存环境中高温高压腐蚀行为的影响
Corrosion & Protection（2009）
Abstract
用失重法、扫描电镜(SEM)、X射线能谱(EDS)及X射线衍射(XRD)等方法,就H2S分压对SM80SS特级抗硫套管钢在CO2/H2S共存条件下的腐蚀行为的影响进行了试验研究.结果表明:在试验条件下,低PH2S时,以CO2腐蚀为主,腐蚀产物膜由FeS0.9和FeCO3组成,腐蚀产物膜颗粒细小、致密,平均腐蚀速率较低;随着PH2S的增大,反应逐渐变为以H2S为主,FeS0.9逐渐转变为FeS,腐蚀产物膜颗粒粗大、疏松,随后又变得细小、致密,腐蚀速率呈现先增大后逐渐减小的趋势;高PH2S时,FeS的生成较大程度阻碍了FeCO3的生成.腐蚀产物有较好的局部腐蚀阻碍作用,腐蚀形式均为均匀腐蚀.
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Key words
CO2/H2S,corrosion product film,corrosion mechanism,super anti-sulfide well tube steel SM80SS,H2S partial pressure
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