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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 |
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