酸性环境中CO2对2205不锈钢应力腐蚀的影响
Effect of CO2 on Stress Corrosion of 2205 Stainless Steel in Acid Environment
摘 要
采用U形弯曲试样浸泡、慢应变速率试验和电化学测试研究了2205双相不锈钢在不含和含有CO2的硫化氢介质中的腐蚀行为和应力腐蚀开裂，并用扫描电镜观察了慢拉伸后的断口形貌。结果表明，溶液中CO2的存在能降低双相不锈钢的点蚀电位，增加其维钝电流密度和腐蚀电流密度。同时，CO2会促进双相不锈钢的应力腐蚀敏感性，使得双相不锈钢呈现明显的脆性断裂。
应力腐蚀
CO2/H2S
duplex stainless steel
stress corrosion
CO2/H2S
Abstract
The corrosion behaviour and stress corrosion cracking of 2205 duplex stainless steel in H2S medium with and without CO2 were studied by u-shaped bending specimen soak, slow strain rate testing and electrochemical measurements. The fracture morphology after slow strain rate testing was observed by scanning electron microscopy. The results show that the existence of CO2 in the solution can reduce the pitting potential of the duplex stainless steel, increase the passive current density and corrosion current density. CO2 can promote the stress corrosion sensitivity of the duplex stainless steel, make the duplex stainless steel suffer brittle fracture clearly.
中图分类号 TG174.3
所属栏目 试验研究
基金项目 国家自然基金重点项目(51131001)
收稿日期 2012/9/20
修改稿日期
网络出版日期
作者单位点击查看
备注李晓刚,教授,博士生导师,
引用该论文: LUO Hong,YU Cheng-yu,BI Yan-feng,LI Hao,LIU Zhi-yong,LI Xiao-gang. Effect of CO2 on Stress Corrosion of 2205 Stainless Steel in Acid Environment[J]. Corrosion & Protection, 2013, 34(8): 659
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参考文献
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【15】刘智勇,董超芳,李晓刚,等. 硫化氢环境下两种不锈钢的应力腐蚀开裂行为[J]. 北京科技大学学报,2009,31(3):318-323.
【2】De Moraes F D,Bastian F L,Ponciano J A. Influence of dynamic straining on hydrogen embrittlement of UNS G41300 and UNS S31803 steels in a low H2S concentration environment[J]. Corros Sci,2005,47(6):1325-1335.
【3】Oltra R,Desestret A,Mirabal E,et al. The stress corrosion cracking of duplex stainless steels in environments containing chlorides and H2S:Study of the ferrite phase behaviour[J]. Corros Sci,1987,27(10/11):1251-1269.
【4】Van Gelder K,Erlings J G,Damen J W M,et al. The stress corrosion cracking of duplex stainless steel in H2S/CO2/Cl- environment[J]. Corros Sci,1987,27(10/11):1271-1279.
【5】耿春雷,顾军,徐永模,等. 油气田中CO2/H2S腐蚀与防护技术的研究进展[J]. 材料导报A:综述篇,2011,25(1):119-122.
【6】李全安,张 清,文九巴,等. CO2对油气管材的腐蚀规律及预测防护[J]. 腐蚀科学与防护技术,2004,16(6):381-384.
【7】赵永峰,王吉连,左禹,等. 在含CO2/H2S介质中油气田用钢的腐蚀研究进展[J]. 石油化工腐蚀与防护,2010,27(1):1-7.
【8】Masamura K. Polarization behavior of high-alloy OCTG in CO2 environment as affected by chlorides and Sulfides[J]. Corrosion,1987,43(6):359-365.
【9】Srinivasan S. Experiment simulation of multiphase CO2/H2S system[J]. Corrosion,1999,55(14):1168-1182.
【10】杨新田,周琦,赵勇成. 几种常用管线钢在CO2及H2S/CO2环境中的腐蚀行为[J]. 金属热处理,2012,37(7):118-121.
【11】李党国,冯耀荣,白真权,等. 温度对N80碳钢CO2腐蚀产物膜性能的影响[J]. 中国腐蚀与防护学报,2008,28(6):369-371.
【12】李廷取,吴化,李雪松. 天然气输气管线钢的CO2腐蚀行为[J]. 腐蚀与防护,2008,29(5):260-263.
【13】El Yazgi A A,Hardie D. Stress corrosion cracking of duplex and super duplex stainless steels in sour environments[J]. Corros Sci,1998,39(5):909-930.
【14】Yokobori A T J,Chinda Y,Nemoto T,et al. The characteristics of hydrogen diffusion and concentration around a crack tip concerned with hydrogen embrittlement[J]. Corros Sci,2002,44(3):407-424.
【15】刘智勇,董超芳,李晓刚,等. 硫化氢环境下两种不锈钢的应力腐蚀开裂行为[J]. 北京科技大学学报,2009,31(3):318-323.
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