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| A CORROSION INHIBITION OF MILD STEEL BY NOVEL TRIAZOLE COMPOUND IN 1 mol/L HCl SOLUTION |
| ZHANG Shengtao1; TAO Zhihua1;2; LI Weihua2; DENG Junying2; HOU Baorong2 |
1. College of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400044
2. Institute of Oceanology; Chinese Academy of Sciences; Qingdao 266071 |
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Abstract A newly synthesized triazole compound, 3-(4-fluoro-phenyl)-1- {4-([1,2,4]triazol-1-ylmethoxy)-phenyl}-propenone（FTPP）, was investigated as corrosion inhibitor of mild steel in 1mol/L HCl solution using weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. Then the surface morphology was studied by scanning electron microscopy (SEM). Generally, inhibition efficiency of the investigated compound was found to depend on the concentration of the inhibitor. The results showed that FTPP has excellent inhibiting effect and its inhibition efficiency（IE%）up to 91.4% at a concentration of 1 mmol/L. Potentiodynamic polarization curves of mild steel in 1 mol/L HCl solution clearly revealed that both cathodic and anodic processes of corrosion were suppressed. Thus, FTPP is inhibitor of mixed-type. The inhibition efficiencies obtained from weight loss measurement and electrochemical tests were in good agreement. Thermodynamic parameters such as adsorption heat (ΔH0ads), adsorption entropy (ΔS0ads) and adsorption free energy (Δ G0ads) were obtained and discussed from experimental data of the temperature studies of the inhibition process at four temperatures ranging from 298 K to 318 K. The adsorption processes are exothermic reaction and belong to chemisorption and physisorption. The Langmuir isotherm model is followed.
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Received: 17 April 2008
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Corresponding Authors:
ZHANG Shengtao
E-mail: stzhang@cqu.edu.cn
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