X70管线钢在醋HAc-CO2共存环境中的顶部腐蚀行为
Top-of-line Corrosion Behavior of X70 Pipeline Steel in HAc-CO2 Environment
摘 要
针对X70管线钢在HAc-CO2共存环境中的顶部腐蚀行为, 利用高温高压冷凝反应釜进行不同含量醋酸的顶部腐蚀试验, 研究腐蚀速率随醋酸浓度变化的影响。通过扫描电镜(SEM)和能谱分析(EDS)分析了腐蚀产物膜的微观形貌和成分。利用电化学冷凝反应釜研究了X70管线钢随HAc浓度变化的电化学腐蚀规律。结果表明,HAc含量越大, pH越小, 腐蚀产物膜的保护性变差, 导致X70管线钢的腐蚀速率增大; HAc含量升高, 腐蚀电位向正向偏移, 阴极反应电流增大, 表明HAc的添加促进了阴极反应过程; 低频感抗弧的出现是由于中间吸附产物的形成和溶解, 从而影响FeCO3膜的形成和沉积。
顶部腐蚀
CO2腐蚀
HAc腐蚀
X70 pipeline steel
top-of-line corrosion
CO2 corrosion
HAc corrosion
Abstract
Top-of-line corrosion behavior of X70 pipeline steel in HAc-CO2 environment was researched. Simulation laboratory experiment was performed in high temperature and high pressure condensation autoclave to research the effect of HAc concentration on X70 corrosion. SEM and EDS were used to analyze the morphology and characteristics of corrosion scales formed in various HAc concentrations. In addition, the electrochemical behavior of X70 pipeline steel was studied using electrochemical condensation autoclave. With addition of HAc, the corrosion rate increased with the increase of HAc concentration. It was attributed to the fact that HAc degraded the formation of protective FeCO3 scale due to the decrease of pH. In high acetic acid concentration environment, the corrosion potential was shifted toward more positive values, which was due to the increase of cathodic current. It can be deduced that HAc promotes the cathodic process. The adsorbed intermediate product resulted in the inductive loop, which affected the formation and deposit of FeCO3.
中图分类号 TG172.6 DOI 10.11973/fsyfh-201508002
所属栏目 试验研究
基金项目 国家科技重大专项基金(2011ZX05056)
收稿日期 2015/3/18
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备注许立宁(1976-),博士,副教授,从事金属的腐蚀与防护相关研究,
引用该论文: ZHANG Yu-nan,XU Li-ning,WANG Bei,CHANG Wei,HU Li-hua,JIANG Zi-tao,LU Min-xu. Top-of-line Corrosion Behavior of X70 Pipeline Steel in HAc-CO2 Environment[J]. Corrosion & Protection, 2015, 36(8): 700
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参考文献
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【12】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.
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【2】MENAUL P L. Causative agents of corrosion in distillate field[J]. Oil and Gas Journal,1944,43(27): 80-81.
【3】HACKERMAN N,SCHOCK D A. Surface layers on steel in natural gas condensate wells[J]. Ind and Eng Chem,1947,39(7): 863-865.
【4】ZHANG G A,CHENG Y F. Corrosion of X65 steel in CO2-saturated oilfield formation water in the absence and presence of acetic acid[J]. Corrosion Science,2009,51: 1589-1595.
【5】ZHANG G A,CHENG Y F. On the fundamentals of electrochemical corrosion of X65 steel in CO2-containing formation water in the presence of acetic acid in petroleum production[J]. Corrosion Science,2009,51: 87-94.
【6】AMRI J,GULBRANDSEN E,NOGUEIRA R P. Role of acetic acid in CO2 top of the line corrosion of carbon steel[C]//66th NACE Annual Conf,Houston TX: NACE International,2004: 11329.
【7】SINGER M,NESIC S,GUNALTUN Y. Top of the line corrosion in presence of acetic acid and carbon dioxide[C]//59th NACE Annual Conf,Houston TX: NACE International,2004: 04377.
【8】DOUGHERTY J A. A review of the effect of organic acids on CO2 corrosion[C]//59th NACE Annual Conf,Houston TX: NACE International,2004: 04376.
【9】JIA Z J,LI X G,DU C W,et al. Effect of acetic acid on CO2 corrosion of 3Cr low-alloy steel[J]. Materials Chemistry and Physics,2012,132(2/3): 258-263.
【10】刘东, 邱于兵, 郭兴蓬. N80碳钢CO2/HAc腐蚀电化学过程[J]. 中国腐蚀与防护学报, 2009,29(1): 44-49.
【11】邓海英, 何晓英, 王红云,等. X70钢在饱和CO2的HAc-NaAc溶液中的腐蚀行为[J]. 中国腐蚀与防护学报, 2007,27(4): 224-227.
【12】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.
【13】CROLET J L,THEVENOT N,DUGSTAD A. Role of free acetic acid on the CO2 corrosion of steels[C] //54th NACE Annual Conf,Houston TX: NACE International,1999: 99024.
【14】HEDGES B,MCVEIGH L. The Role of acetate in CO2 corrosion: The double whammy[C]//54th NACE Annual Conf,Houston TX: NACE International,1999: 99021.
【15】GULBRANDSEN E. Acetic acid and carbon dioxide corrosion of carbon steel covered with iron carbonate[C]//62th NACE Annual Conf,Houston TX: NACE International,2007: 07322.
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