向日葵盘果胶对碳钢的缓蚀性能研究

The Anticorrosive Activity of Sunflower Head Pectin for Carbon Steel

以向日葵盘为原料,利用纤维素酶制备果胶(SFP)。采用静态失重、极化曲线和交流阻抗技术研究SFP在1mol/L HCl及0.5mol/L H_2SO_4溶液中对碳钢的缓蚀性能,并探讨其在碳钢表面的吸附机理。结果表明,缓蚀效率随SFP浓度增大而增大,随温度升高而降低。在HCl和H_2SO_4溶液中,SFP的吸附方式分别服从Langmuir和Temkin等温式,属于物理吸附;极化曲线测试显示SFP是一种混合型缓蚀剂。本文的研究表明,向日葵盘果胶是碳钢的绿色高效缓蚀剂,且在HCl溶液中的缓蚀性能优于在H_2SO_4溶液中。

Pectin extracted from the sunflower head（SFP） was tested as a corrosion inhibitor for carbon steel in1 mol/L HCl and 0.5mol/L H2SO4 solutions,respectively.The anticorrosive activity and adsorption behavior of SFP were investigated using weight loss measurements,polarization curve and electrochemical impedance spectroscopy（EIS） methods.The results showed that inhibition efficiency increased with increasing inhibitor concentration,and decreased with increasing temperature.The Langmuir isotherm provided the best description for adsorption behavior of SFP in HCl solution,while Temkin isotherm for adsorption behavior of SFP in H2SO4 solution.Potentiodynamic polarization study revealed that SFP was a mix-typed inhibitor.The results of this study showed that SFP is an ecofriendly,efficient corrosion inhibitor for carbon steel,and its corrosion inhibition performance in HCl solution is better than that in H2SO4 solution due to the synergistic effect of Cl^-.