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首页> 外文期刊>International Journal of Electrochemical Science >Investigation of Synergistic Inhibition Effect of Methyl Violet and Bromide on the Corrosion of Mild Steel in Phosphoric Acid Solution
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Investigation of Synergistic Inhibition Effect of Methyl Violet and Bromide on the Corrosion of Mild Steel in Phosphoric Acid Solution

机译：甲基紫和溴化物对磷酸溶液中低碳钢腐蚀的协同抑制作用研究

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摘要

The inhibition of mild steel corrosion in 1.0 mol/dm phosphoric acid (H3PO4) solution by methylviolet without and with bromide ion was studied using weight loss, potentiodynamic polarization andelectrochemical impedance spectroscopy methods. The results indicate that combination of methyl3 violet and bromide ion performs excellent as inhibitor for mild steel corrosion in 1.0 mol/dm H3PO4and a stronger synergistic effect exists between methyl violet and bromide ion. The electrochemicalresults indicate that single methyl violet or combination of bromide ion and methyl violet behaves asmixed type inhibitor with predominated of cathodic effect, and the corrosion reaction is controlled bycharge transfer process. It is found that the adsorption process obeys Temkin adsorption isotherm inthe absence of bromide ion and Langmuir adsorption isotherm in the presence of bromide ion,o o o respectively. The thermodynamic and kinetic parameters (G ads, H ads,S ads, Kads and Ea ) werecalculated and discussed. The adsorption of inhibitor molecules on the steel surface is a spontaneousprocess containing physisorption and chemisorption. The outcomes from weight loss study are well inagreement with those obtained from electrochemical measurements.
机译：研究了失重，电位动力学极化和电化学阻抗谱法研究了甲基溴在无溴和有溴离子的情况下对1.0 mol / dm磷酸（H3PO4）溶液中低碳钢腐蚀的抑制作用。结果表明，甲基3紫和溴离子的结合在1.0 mol / dm的H3PO4中作为缓和钢腐蚀的抑制剂表现优异，并且甲基紫和溴离子之间具有更强的协同作用。电化学结果表明，单一的甲基紫或溴离子和甲基紫的结合物表现出以混合型抑制剂为主的阴极效应，并且腐蚀反应受电荷转移过程控制。发现在不存在溴离子的情况下吸附过程遵循Temkin吸附等温线，在存在溴离子的情况下遵守Langmuir吸附等温线。计算和讨论了热力学和动力学参数（G ads，H ads，S ads，Kads和Ea）。抑制剂分子在钢表面的吸附是一个自发的过程，包含物理吸附和化学吸附。减肥研究的结果与电化学测量的结果非常吻合。

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