新型三氮唑化合物在1mol/L HCl中对Q235钢的缓蚀性能

A CORROSION INHIBITION OF MILD STEEL BY NOVEL TRIAZOLE COMPOUND IN 1 mol/L HCl SOLUTION

合成一种新型三氮唑化合物:3-(4-氟基苯)-1-4-(1,2,4-三氮唑-1-甲氧基)-苯-丙烯酮(FTPP),并通过失重、动电位极化、交流阻抗及扫描电镜等方法,研究其在1 mol/L HCl溶液中对Q235碳钢的缓蚀效果。结果表明,在1 mol/L HCl溶液中,FTPP的缓蚀性能有赖于缓蚀剂的浓度,当缓蚀剂浓度达到1 mmol/L时缓蚀效率达91.4%,能同时抑制碳钢腐蚀的阴、阳极反应过程,该缓蚀剂是一种混合型缓蚀剂.失重实验与电化学实验所获得的结果具有很好的一致性。FTPP化合物在碳钢表面上的吸附过程为放热过程,其在碳钢表面的吸附服从Langmuir等温式,属于物理和化学吸附。

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 lmol/L HC1 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 HCI 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 （△Hads^O）, adsorption entropy （△Sads^O） and adsorption free energy （△Gads^Os） 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.