高温高压下20钢和13Cr钢在不同含量甲酸-CO2环境中的腐蚀行为
Corrosion Behavior of 20 Steel and 13Cr Steel in Different Content Formic Acid-CO2 Environment under High Pressure and High Temperature
摘 要
采用腐蚀失重测试、腐蚀产物分析等方法，研究了20钢和13Cr钢在模拟油井管道环境（甲酸与CO2共存，100 ℃、1 MPa）中的腐蚀速率和腐蚀类型，并探讨了甲酸含量对其腐蚀行为的影响。结果表明：两种钢的腐蚀速率均随甲酸含量的增加而增大，13Cr钢的腐蚀速率低于20钢的；20钢的腐蚀类型为均匀腐蚀，13Cr钢的为点蚀；20钢表面有FeCO3的生成和碳酸盐的沉积，FeCO3产物层覆盖部位不断发生基体的溶解，而钙、镁碳酸盐沉积的位置不断出现产物沉积，在基体腐蚀相对较慢的部位形成突起；13Cr钢优先发生铬的溶解，形成以Cr（OH）3为主的钝化膜，随着甲酸含量的增加，钝化膜的稳定性、致密性均降低，H+和Cl-通过钝化膜与基体接触，促进了点蚀的发生。
13Cr钢
甲酸
腐蚀行为
20 steel
13Cr steel
formic acid
corrosion behavior
Abstract
The corrosion rate and corrosion type of 20 steel and 13Cr steel in simulated well pipe environment (foric acid coexisting with CO2, 100℃, 1 MPa) were studied by the weight method and analyzation of corrosion product. The effect of formic acid content on corrosion behavior was discussed. The results indicate that the corrosion rate of two steels increased with increase of formic acid content, and the corrosion rate of 13Cr steel was lower than that of 20 steel. The corrosion type of 20 steel was uniform corrosion, and corrosion type of 13Cr steel was pitting. There were FeCO3 production and carbonate deposition on the surface of 20 steel. The substrate was dissolved continuously in the position covered by FeCO3 production, and the product was deposited continuously in the position deposited by carbonate. The position with lower corrosion rate was bulged on the surface of substrate. The dissolution of Cr occurred in 13Cr steel and passive film formed on the surface. With increase of formic acid content, the stability and density of passive film were reduced and H+ and Cl- contacted with substrate through passive film which promote the occurrence of pitting.
中图分类号 TG172 DOI 10.11973/jxgccl201709007
所属栏目 试验研究
基金项目
收稿日期 2017/2/26
修改稿日期 2017/8/7
网络出版日期
作者单位点击查看
备注刘锐(1980-),男,甘肃镇原人,工程师,学士
引用该论文: LIU Rui,ZHANG Yuhui,LI Long,LI Yinxian. Corrosion Behavior of 20 Steel and 13Cr Steel in Different Content Formic Acid-CO2 Environment under High Pressure and High Temperature[J]. Materials for mechancial engineering, 2017, 41(9): 42～47
刘锐,张煜辉,李龙,李引贤. 高温高压下20钢和13Cr钢在不同含量甲酸-CO2环境中的腐蚀行为[J]. 机械工程材料, 2017, 41(9): 42～47
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参考文献
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【2】赵国仙, 严密林, 路民旭,等. 石油天然气工业中CO2腐蚀的研究进展[J]. 腐蚀与防护, 1998,19(2):51-54.
【3】MENUAL P L. Causative agents of corrosion in distillate field[J]. Oil and Gas Journal, 1944, 43:80-81.
【4】SRGJAN N, HUI L, DUSAN S, et al. An open source mechanistic model for CO2/H2S corrosion of carbon steel[C]//Corrosion 2009 Conference and Expo. Houston:NACE, 2009.
【5】INVERNIZZI A J, SIVIERI E, TRASATTI S P, et al. Corrosion behaviour of duplex stainless steels in organic acid aqueous[J]. Materials Science & Engineering, 2008, 485(1):234-242.
【6】GULBRANDSEN E, BILKOVA K. Solution chemistry effects on corrosion of carbon steels in presence of CO2 acetic acid[C]//Corrosion 2006 Conference and Expo. Houston:NACE, 2006.
【7】GEORGE K. Electrochemical investigation of CO2 corrosion of mild steel in the presence of acetic acid[J]. Corrosion Science Section, 2007, 63(2):178-186.
【8】PLETCHER D, SIDORIN D, HEDGES B, et al. Acetate-enhanced corrosion of carbon steel-further factors in oil field environments[J]. Corrosion, 2007, 63(3):285-294.
【9】AMRI J, GULBRANDSEN E, NOQUEIRA R P, et al. The effect of acetic acid on the pit propagation in CO2 corrosion of carbon steel[J]. Electrochemistry Communications, 2008, 10(2):200-203.
【10】CROLET J L, MICHEL R B. Why so low free acetic acid thresholds in sweet corrosion at low PCO2[C]//Corrosion 2005 Conference and Expo. Houston:NACE, 2005.
【11】MOREIRA R M, FRANCO C V. The effects of temperature and hydrodynamics on the CO2 corrosion of 13Cr and 13Cr5Ni2Mo stainless steels in the presence of free acetic acid[J]. Corrosion Science, 2004, 46(12):2987-3003.
【12】SINGH M M, GUPTA A, MIAO J, et al. Corrosion behavior of mild steel in formic acid solutions[J].Materials Chemistry and Physics, 1996, 46(1):15-22.
【13】TURNBULL A, RYAN M, WILLETTS A, et al. Corrosion and electrochemical behaviour of 316L stainless steel in acetic acid solution[J]. Corrosion Science, 2003, 45(5):1051-1072.
【14】李琼玮,张建勋,刘故箐.油田的有机酸-CO2环境中碳钢腐蚀研究的进展[J].腐蚀科学与防护技术,2013,25(2):165-168.
【15】ZHU S D, FU A Q, MIAO J, et al. Corrosion of N80 carbon steel in oil field formation water containing CO2 in the absence and presence of acetic acid[J].Corrosion Science, 2011, 53(10):3156-3165.
【16】NAFDAY O, NESIC S. Iron carbonate film scale formation and CO2 corrosion the presence of acetic acid[J].Journal of Biochemistry, 2005, 51(10):3-8.
【17】高延敏,王文,徐永祥,等.有机酸对A3钢腐蚀的影响[J].腐蚀科学与防护技术,2002,14(6):326-328.
【18】LINTER B R, BURSTEN G T. Reaction of pipeline steels in carbon dioxide solutions[J]. Corrosion Science, 1994, 41(2):117-129.
【19】IKEDA A, MUKAI S, SUEDA M. Corrosion behaviour of 9 to 25% Cr in wet CO2 environment[J]. Corrosion, 1985, 41(4):185-192.
【20】吕祥鸿,赵国仙,樊治海,等.高温高压下Cl-浓度、CO2分压对13Cr不锈钢点蚀的影响[J].材料保护,2004,37(6):34-37.
【21】叶超,杜楠,赵晴,等.不锈钢点蚀行为及研究方法的进展[J].腐蚀与防护,2014,35(3):271-276.
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