Improvement of corrosion resistance for brass in 3.5% NaCl media by using 4- fluorophenyl-2, 5-dithiohydrazodicarbonamide

Mothana Ghazi Kadhim AlFalah, Ahmed Elid, Amgad Ahmed ABDO ALİ, E. Kamberli, Bahar Nazli, Sevilay Koyun, Alihan Tosun, Muhammed Kadi̇rli̇oğlu, Fatma Elkassum, Saleh Quddus Saleh, Abdulrahman Obied, Fatma Kandemi̇rli̇
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Abstract

Corrosion poses a significant challenge for numerous industries. The use of corrosion inhibitors is essential within these industries. The efficacy of environmentally friendly corrosion inhibitors should remain high even when used at low concentrations. In the present study, the compound 4- fluorophenyl-2,5- dithiohydrazodicarbonamide (FTSC) was used as a corrosion inhibitor for brass in 3.5% NaCl solution. The inhibitor efficiency was determined by using a series of electrochemical techniques such as open circuit potential (OCP), potential dynamic polarisation (PDP), linear polarisation resistance (LPR), and electrochemical impedance spectroscopy (EIS). All experimental tests have been done in stagnant conditions. The findings of the experiments revealed that the compound FTSC looked to be of the cathodic type. Furthermore, the maximum inhibitor efficiency was reached at 98.28% at 1 × 10-3 and at an immersion time of 1 h. The current density was reduced from 16.5 to 0.284 A.cm-2. The adsorption of compound on the brass surface in 3.5% NaCl solution obeyed the Langmuir isotherm with a low negative value of the standard Gibbs free energy of adsorption (-33.8 kJ/mol ΔGads (chemisorption and physisorption). The results confirmed that the compound FTSC can be used as a corrosion inhibitor for brass in 3.5% NaCl.
4-氟苯基- 2,5 -二硫代肼二酰胺提高黄铜在3.5% NaCl介质中的耐蚀性
腐蚀是许多行业面临的重大挑战。在这些行业中,使用缓蚀剂是必不可少的。即使在低浓度下使用,环保型缓蚀剂的效果也应保持高。在3.5% NaCl溶液中,用化合物4-氟苯基-2,5-二硫代肼二碳酰胺(FTSC)作为黄铜的缓蚀剂。通过开路电位(OCP)、电位动态极化(PDP)、线性极化电阻(LPR)和电化学阻抗谱(EIS)等一系列电化学技术来确定缓蚀剂的效率。所有的实验测试都是在停滞的条件下进行的。实验结果表明,化合物FTSC看起来是阴极型的。在1 × 10-3、浸泡时间为1 h的条件下,阻垢剂的效率最高可达98.28%,电流密度从16.5降低到0.284A.cm-2。化合物在3.5% NaCl溶液中在黄铜表面的吸附服从Langmuir等温线,吸附的标准吉布斯自由能为-33.8 kJ/mol ΔGads(化学吸附和物理吸附)。结果表明,化合物FTSC在3.5% NaCl中可作为黄铜的缓蚀剂。
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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