Corrosion Inhibition, Adsorption and Thermodynamic Properties of Poly (Sodium 4-Styrenesulfonate) on Carbon Steel in Phosphoric Acid Medium

IF 0.4 Q4 CHEMISTRY, ANALYTICAL
T. Attar, A. Benchadli, M. Boulanouar, E. Choukchou-Braham
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引用次数: 1

Abstract

The use of polymers as corrosion inhibitors has attracted much attention due to their low prices, inherent stability, availability and cost-effectiveness. The corrosion inhibiting effect of poly(sodium-4-styrenesulfonate) on carbon steel in phosphoric acid solution has been investigated using weight loss and scanning electron microscopy techniques (SEM) and theoretical calculations based on density functional theory (DFT). In the presence of 1.0×10-3 mol/L of inhibitor, a maximum inhibition effect of 98.06 % was observed. The influence of the concentration of the inhibitor, the temperature of the solution and the immersion time on the corrosion of carbon steel was investigated. Activation parameters such as activation energy (Eact), activation enthalpy (ΔHact), activation entropy (ΔSact), heat of adsorption (Qads) and adsorption free energy (ΔGads) were evaluated based on the effect of temperature on the corrosion and inhibition processes. It was found that the adsorption behaviour of poly(sodium-4-styrenesulfonate) (PSS) follows the Langmuir isotherm and the free energy change values indicate mixed chemical and physical adsorption on the carbon steel surface. The results obtained with the different methods agree well.
磷酸介质中聚4-苯乙烯磺酸钠对碳钢的缓蚀、吸附及热力学性能
聚合物作为缓蚀剂由于其低廉的价格、固有的稳定性、可获得性和成本效益而备受关注。采用失重和扫描电镜技术,以及基于密度泛函理论(DFT)的理论计算,研究了聚4-苯乙烯磺酸钠对碳钢在磷酸溶液中的缓蚀作用。当抑制剂浓度为1.0×10-3 mol/L时,最大抑制率为98.06%。考察了缓蚀剂的浓度、溶液温度和浸泡时间对碳钢腐蚀的影响。根据温度对腐蚀和缓蚀过程的影响,对活化能(Eact)、活化焓(ΔHact)、活化熵(ΔSact)、吸附热(Qads)和吸附自由能(ΔGads)等活化参数进行了评价。结果表明,聚4-苯乙烯磺酸钠(PSS)的吸附行为符合Langmuir等温线,其自由能变化值表明PSS在碳钢表面的化学和物理混合吸附。不同方法所得结果吻合较好。
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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来源期刊
French-Ukrainian Journal of Chemistry
French-Ukrainian Journal of Chemistry CHEMISTRY, ANALYTICAL-
自引率
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发文量
13
审稿时长
4 weeks
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