Three pyrazine derivatives as corrosion inhibitors for steel in 1.0 M H2SO4 solution |
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| Authors: | Xianghong Li Shuduan Deng Hui Fu |
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| Affiliation: | aFaculty of Science, Southwest Forestry University, Kunming 650224, PR China;bKey Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China Ministry of Education, Southwest Forestry University, Kunming 650224, PR China;cFaculty of Materials Engineering, Southwest Forestry University, Kunming 650224, PR China |
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| Abstract: | The inhibition effect of three pyrazine derivatives of 2-methylpyrazine (MP), 2-aminopyrazine (AP) and 2-amino-5-bromopyrazine (ABP) on the corrosion of cold rolled steel (CRS) in 1.0 M H2SO4 solution was studied by weight loss, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods. The results show that all pyrazine compounds are good inhibitors, and inhibition efficiency follows the order: ABP > AP > MP. The adsorption of each inhibitor on CRS surface obeys Langmuir adsorption isotherm. For all these pyrazine derivatives, they act as mixed-type inhibitors. The probable inhibitive mechanism is proposed from the viewpoint of adsorption theory. |
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| Keywords: | A Steel B EIS B Polarization B Weight loss C Acid inhibition |
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