Iodine–β-Cyclodextrin: An Effective Corrosion Inhibitor for Carbon Steel in Sulfuric Acid Solution - Experimental Design and Investigating Thermodynamic Parameters

T. Attar, A. Benchadli, Esma CHOUKCHOU BRAHAM, Amal Benkhaled
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Abstract

Widely used across industries, carbon steel is vulnerable to corrosion in aggressive environments, especially acidic ones. Thus, effective methods to mitigate metal corrosion from acids are crucial. Inhibitors are extensively used to prevent corrosion in industries, with the potential for improved protective performance. The design of experiments was employed to determine the optimal conditions for enhancing the inhibitor efficiency of Iodine–β-Cyclodextrin (Iodine/β-CD) in a sulfuric acid solution at temperatures ranging from 20°C to 50°C. The relationship between the factors and responses was established using response surface methodology (RSM), employing regression statistical analysis and probabilistic analysis. A single response was recorded: inhibitor efficiency was determined by measuring weight loss before and after immersion in the inhibitor solution. Thermodynamic parameters were also computed to determine adsorption and activation processes. The statistical analysis revealed that the quadratic models for inhibition efficiencies (IE) were highly significant with a coefficient of multiple regressions R2= 0.997. Further validation of the model indicated a good fit (R2 Adj= 0.994), and the experimentally observed values aligned well with predicted ones, demonstrating a highly significant model with Q2= 0.978. The theoretical efficiency predicted by the RSM model was 88.41%, whereas the efficiency observed during the experimental test procedure with the best-evaluated variables was 82.45%. In conclusion, this paper aims to identify the optimal conditions for employing Iodine–β-Cyclodextrin as a new corrosion inhibitor for carbon steel, utilizing experimental design methods. The results indicate that iodine/β-CD exhibits remarkable corrosion inhibitory properties for carbon steel under specific conditions.
碘-β-环糊精:硫酸溶液中碳钢的有效缓蚀剂--实验设计与热力学参数研究
碳钢广泛应用于各行各业,但在腐蚀性环境中,尤其是酸性环境中,碳钢很容易受到腐蚀。因此,采用有效的方法减轻酸对金属的腐蚀至关重要。工业中广泛使用抑制剂来防止腐蚀,从而提高保护性能。实验设计用于确定在 20°C 至 50°C 的硫酸溶液中提高碘-β-环糊精(碘/β-CD)抑制剂效率的最佳条件。利用响应面方法(RSM),采用回归统计分析和概率分析,确定了各因素与响应之间的关系。只记录了一个响应:通过测量浸入抑制剂溶液前后的重量损失来确定抑制剂效率。还计算了热力学参数,以确定吸附和活化过程。统计分析显示,抑制效率(IE)的二次模型非常显著,多重回归系数 R2= 0.997。对模型的进一步验证表明拟合良好(R2 Adj=0.994),实验观测值与预测值吻合良好,Q2= 0.978,表明模型高度显著。RSM 模型预测的理论效率为 88.41%,而在使用最佳评估变量的实验测试程序中观察到的效率为 82.45%。总之,本文旨在利用实验设计方法,确定使用碘-β-环糊精作为碳钢新型缓蚀剂的最佳条件。结果表明,在特定条件下,碘/β-CD 对碳钢具有显著的缓蚀性能。
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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