硫酸介质中榕树叶提取液的缓蚀性能及其与KI的缓蚀协同效应

Corrosion Inhibition of Ficus Microcarpa Leaves Extract and Its Synergistic Effect with KI in Sulfuric Acid

通过电化学方法和失重法,研究了榕树叶提取液(FLE)对碳钢在硫酸溶液中的缓蚀性能,同时研究了它与KI的缓蚀协同效应,探讨了缓蚀机理。研究结果表明:在硫酸溶液中,FLE对碳钢属混合抑制型缓蚀剂,缓蚀效率随其浓度的增加而增大;FLE与KI之间存在良好的协同效应,两者复配后,体系的腐蚀电流密度减小,电荷传递电阻增大,双电层电容减小,缓蚀效率增大,表现出更好的缓蚀作用;FLE与KI复配前后,其在碳钢表面的吸附均为自发过程,且符合Langmuir吸附等温方程。

Through electrochemical methods and weight loss measurement, the corrosion inhibition of ficus microcarpa leaves extract （FLE） for carbon steel in sulfuric acid solutions was studied, and the synergistic effect between FLE and KI was investigated, furthermore the inhibition mechanism of FLE was discussed. The results showed that FLE was a mixed-type inhibi- tor for carbon steel, and the inhibition efficiency of FLE for carbon steel increased with increase of the concentration of FLE. There existed significant synergistic effect between FLE and KI, which made the mixture of FLE and KI was used as corrosion in- hibitor, the corrosion current density and double layer capacitance decreased, the charge transfer resistance increased, conse- quently showed better corrosion inhibition and higher inhibition efficiency. The adsorption of FLE with the presence and absence of KI on the carbon steel surface was a spontaneous process, and obeyed Langmuir adsorption isotherm model.