Abstract

The role of Echium angustifolium Mill extract for advancing corrosion resistance of carbon steel in 1.0 M H₂SO₄ solution was discussed in this research. Weight loss (WL), open circuit potential (OCP), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) methods were applied to monitor the corrosion behavior of carbon steel in 1.0 M H₂SO₄ solution. The influence of temperature was studied from 25–45°C and some thermodynamic parameters were computed. The Surface morphology of the carbon steel surface was examined via different techniques. These measurements confirmed that the existence of Echium angustifolium Mill extract reduces the corrosion rate (CR), corrosion current densities (i_corr), and double layer capacities (C_dl), simultaneously increase the polarization resistance (R_p) values. Tafel plots observed that the Echium angustifolium Mill extract play as a mixed type inhibitor. Electrochemical impedance confirmed that the existence of the applicable extract reduced the double layer capacitance and enhanced the charge transfer resistance. The extract molecules adsorbed on the metal surface follow Langmuir adsorption isotherm. The gained data confirmed that the inhibition efficiency (η%) increase with the increase of extract concentration.

中文翻译：

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gust草提取物在缓解硫酸溶液中碳钢腐蚀中的作用

摘要

本文探讨了Echium angustifolium Mill提取物对提高碳钢在1.0 MH ₂ SO ₄溶液中的耐腐蚀性的作用。采用失重（WL），开路电势（OCP），电势极化（PP）和电化学阻抗谱（EIS）方法监测碳钢在1.0 MH ₂ SO ₄溶液中的腐蚀行为。在25–45°C的温度范围内研究了温度的影响，并计算了一些热力学参数。通过不同的技术检查了碳钢表面的表面形态。这些测量结果证实了Echium angustifolium的存在研磨提取物降低了腐蚀速率（CR），腐蚀电流密度（i _corr）和双层容量（C _dl），同时增加了极化电阻（R _p）值。Tafel曲线观察到，Echium angustifolium Mill提取物起混合型抑制剂的作用。电化学阻抗证实，适用提取物的存在降低了双层电容并增强了电荷转移电阻。吸附在金属表面的提取物分子遵循Langmuir吸附等温线。获得的数据证实，抑制效率（η％）随着提取物浓度的增加而增加。