Corrosion behaviour of low-alloy martensite steel exposed to vapour-saturated CO₂ and CO₂-saturated brine conditions

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• 作者：Zhenguang Liu^a ; Xiuhua Gao^a ; ^{gaoxiuhua@126.com" class="auth_mail" title="E-mail the corresponding author} ; ^{liuzhenguangabcd@163.com" class="auth_mail" title="E-mail the corresponding author} ; Jianping Li^a ; Linxiu Du^a ; Chi Yu^b ; Ping Li^c ; Xiaolei Bai^a
• 关键词：Corrosion ; Low-alloy steel ; Martensite ; Carbon dioxide corrosion
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 September 2016
• 年：2016
• 卷：213
• 期：Complete
• 页码：842-855
• 全文大小：8000 K

文摘

This work utilizes immersion experiments to investigate the CO₂ corrosion behaviour of low-alloy martensite steel by analysing its microstructure, corrosion kinetics, corrosion phases, surface morphology, cross-section morphology and elemental distribution. The experimental results show that the designed steel is free of localized corrosion and that its corrosion rate in vapour-saturated CO₂ conditions is lower than that in CO₂-saturated brine conditions. The inner layer consists of FeCO₃ crystals and Cr-rich compounds, which plays a crucial role in the corrosion behaviour of the designed steel immersed in CO₂-saturated brine conditions. The corrosion processes of the low-alloy martensite steel immersed in vapour-saturated CO₂ and CO₂-saturated brine conditions are proposed according to the experimental results. Additionally, the microscopic corrosion process of steel materials with a martensite microstructure is presented.