Synergistic Inhibition of Mild Steel Corrosion in Seawater and Acidic Medium by Cathodic Protection and Monodora myristica Using Zinc Anode

IF 1.5 Q4 ELECTROCHEMISTRY International Journal of Corrosion Pub Date : 2018-11-27 DOI:10.1155/2018/5648907

I. Ukpong, O. Bamgboye, O. Soriyan

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引用次数: 6

Abstract

The synergistic inhibition of mild steel corrosion in seawater and 0.1M sulphuric acid by the cathodic protection and Monodora myristica was carried out through the weight loss and the linear polarization resistance (LPR) measurement. The results showed that in seawater, the synergism was not too effective for the protection of steel, whereas in 0.1M sulphuric acid, there was a great synergism between cathodic protection and the oil extracts of Monodora myristica, having an efficiency (IE%) of 102.89% at 15 mL of the oil extracts. For the linear polarization resistance (LPR), in most of the cases, there was a slight shift of the corrosion potential (Ecorr) and the open circuit potential (OPC) toward the positive as the volume of the oil extracts increased, thereby causing a change in the cathodic and the anodic Tafel slopes, which showed that the inhibitor is a mixed- type inhibitor. The corrosion current density (icorr) decreases as the volumes of the oil extract increase. Langmuir adsorption isotherm fitted best with an R2 of 1 unit, indicating a good agreement with the experimental data and with Langmuir adsorption isotherm.

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阴极保护和肉豆蔻酸锌阳极协同抑制软钢在海水和酸性介质中的腐蚀

通过失重和线极化电阻（LPR）测量，研究了阴极保护和肉豆蔻酸对低碳钢在海水和0.1M硫酸中腐蚀的协同抑制作用。结果表明，在海水中，阴极保护对钢铁的保护效果不太好，而在0.1M硫酸中，肉豆蔻的油提取物与阴极保护有很大的协同作用，在15mL的油提取物下，阴极保护的效率（IE%）为102.89%。对于线性极化电阻（LPR），在大多数情况下，随着油提取物体积的增加，腐蚀电位（Ecorr）和开路电位（OPC）略有向正偏移，从而导致阴极和阳极Tafel斜率的变化，这表明抑制剂是一种混合型缓蚀剂。腐蚀电流密度（icorr）随着油提取物体积的增加而降低。Langmuir吸附等温线在R2为1的情况下拟合得最好，表明与实验数据和Langmuir等温线吻合良好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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