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| INHIBITION OF 1-PROPYL-2-METHYL-3-ALKYL BENZIMIDAZOLE ON Q235 STEEL IN HCl SOLUTION |
| LI Xiangxu, YANG Wenzhong |
| College of Science, Nanjing University of Technology, Nanjing 210009 |
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Abstract ANew corrosion inhibitors 1-propyl-2-methyl-3-alkyl benzimidazole salts were synthesized and their inhibition for Q235 steel in 1 mol/L HCl solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Meanwhile, the surface morphology was studied by scanning electron microscopy(SEM). The results showed that benzimidazole salts had excellent inhibiting efficiency at very low concentration and the inhibiting efficiency increased with the increase of alkyl chain. 1-propyl-2-methyl-3-tetradecyl benzimidazole salts had the highest efficiency among four inhibitors, in which the inhibition efficiency reached up to 98.6% at the concentration of 10 mg/L. These inhibitors acted as mixed inhibitors with cathodic inhibition as dominative action.
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Received: 18 January 2011
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Corresponding Authors:
YANG Wenzhong
E-mail: yangwz@njut.edu.cn
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