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| CI-1204水溶性缓蚀剂作用规律研究 |
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刘 刚1, 于 涛2, 马 杰1, 陈 雷1, 王洪松3, 张文亮3, 赵 果3
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(1.中国石油大学储运与建筑工程学院,山东青岛 266580;2.中国石油工程建设公司,北京 100120;3.中石化中原油田普光分公司,四川达州 635000)
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| 摘要: |
| 对CI-1204水溶性缓蚀剂在酸性水溶液环境中的腐蚀作用规律进行研究。建立三电极系统,腐蚀环境为pH=4的盐酸溶液,向溶液中依次添加不同浓度的水溶性缓蚀剂,利用2273电化学工作站对腐蚀系统极化曲线、电化学阻抗谱进行测试。利用PowerSuite拟合极化曲线得到腐蚀电流密度随缓蚀剂添加浓度变化的规律,利用ZSimpWin软件拟合交流阻抗谱。对比等效电路R(Q(R(QR)))与R(QR)(QR)的参数拟合结果,分析缓蚀剂分子在金属表面的吸附状态。结果表明:当缓蚀剂浓度为(200～300)×10-6时,腐蚀电流密度最小,电荷转移电阻值最大;缓蚀剂分子均匀分散吸附在金属表面,形成多个均布、微小孔隙,宏观表现出均匀腐蚀现象。 |
| 关键词: 水溶性缓蚀剂 浓度 腐蚀电流密度 电荷转移电阻 |
| DOI：10.3969/j.issn.1673-5005.2014.03.018 |
| 分类号:TG 17 〖HTH〗 |
| 基金项目:中央高校基本科研业务费专项(14CX06070A) |
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| Study on acting laws of water-soluble corrosion inhibitor CI-1204 |
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LIU Gang1, YU Tao2, MA Jie1, CHEN Lei1, WANG Hong-song3, ZHANG Wen-liang3, ZHAO Guo3
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(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China; ;2.China Petroleum Engineering Construction Corporation, Beijing 100120, China;3.Puguang Branch of Zhongyuan Oilfield, SINOPEC, Dazhou 635000, China)
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| Abstract: |
| The corrosion acting laws of water-soluble corrosion inhibitor CI-1204in acidic aqueous solution environment were studied. By establishing three-electrode system under corrosion environment for pH=4hydrochloric acid solution and different concentrations of water-soluble corrosion inhibitor, corrosion polarization curves and electrochemical impedance spectroscopy were tested by electrochemical workstation 2273. The variation laws of the corrosion current density in different concentrations of added inhibitor were obtained by fitting the polarization curves using PowerSuite. Meanwhile ZSimpWin was used to fit AC impedance spectroscopy. By comparing parameters obtained from two different equivalent circuit models, the absorption of inhibitor molecule on metal surface was analyzed. The results show that the corrosion current density reaches the minimum value and the charge-transfer resistance reaches the maximum value when the inhibitor concentration is(200-300)×10-6. The absorption of inhibitor molecule on metal surface is regarded as uniform, and so are the voids between molecules, so that the corrosion on metal surface is uniform macroscopically. |
| Key words: water-soluble corrosion inhibitor concentration corrosion current density charge-transfer resistance |
