柚子皮提取物对C38的缓蚀作用

Corrosion Inhibition of C38 by Pomelo Peel Extract

目的研究柚子皮提取物对C38钢在1 mol/L HCl中的缓蚀作用。方法通过索氏提取器从柚子皮中提取天然绿色缓蚀剂,进而与0.01 mol/L KI进行复配,采用失重法和电化学测试法分析柚子皮提取物的缓蚀作用机理。结果失重实验表明,柚子皮提取物对C38钢的缓蚀作用最高达93%,而与0.01mol/L KI复配使用后缓蚀效率最高达98%以上。同时表明其在碳钢表面的吸附符合Langmuir吸附等温式;Tafel极化曲线表明其能同时抑制碳钢腐蚀的阴、阳极过程;碳钢的阻抗值随着柚子皮提取物浓度的增加而增大。结论柚子皮提取物是很好的缓蚀剂,与卤素离子复配后效果更佳。

Objective To investigate the performance of pomelo peel extract in corrosion inhibition in 1 mol/L HC1. Methods A natural green corrosion inhibitor was extracted from pomelo peel using soxhlet extraction method, and the mechanism of corrosion inhibition of the extract was analyzed in a complex with 0.01 mol/L KI. Weight-loss and Electrochemical tests were used. Results The result of weight-loss test showed that the corrosion inhibition of the extract to C38 steel was up to 93% , and it reached up to o ver 98% when used in a complex with 0.01 mol/L KI. It was also shown that the adsorption of the inhibitor molecules on the sur face of C38 steel obeyed Langrnuir isotherm. The Tafel polarization curves indicated that both anodic and cathodic corrosion proces ses were suppressed by the inhibitor. The EIS indicated that the charge transfer resistance increased with the increase of the inhibitor concentration. Conclusion Pomelo peel extract is a good corrosion inhibitor and the effect enhanced by the addition of halogen ions.