Assessment of the Amino Acid L-Histidine as a Corrosion Inhibitor for a 1018 Carbon Steel in Aqueous Sodium Chloride Solution

IF 2.4 4区 材料科学 Q2 CRYSTALLOGRAPHY
Crystals Pub Date : 2024-08-02 DOI:10.3390/cryst14080703
Milena Jacinto da Silva Moura, Roberta Bastos Vasques, Saulo Jose de melo Magalhães, Francisco Wagner de Queiroz Almeida Neto, Pedro de Lima Neto, Luís Paulo Mourão dos Santos, Mauro Andres Cerra Florez, Gemma Fargas Ribas, Samuel Lucas Santos Medeiros, Francisco Carlos Carneiro Soares Salomão, Eduardo Bedê Barros, Walney Silva Araújo
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Abstract

The amino acid L-histidine, which has an imidazole ring, was investigated as a corrosion inhibitor for AISI 1018 carbon steel in chloride solution based on the effectiveness of inhibitors containing imidazole in their composition. A neutral environment was chosen for this study due to the scarcity of research on this amino acid in this environment type. Concentrations of 250, 500, and 1000 ppm were evaluated. Various methods were used to determine inhibition effectiveness, including mass loss, open circuit potential, linear potentiodynamic polarization, and electrochemical impedance spectroscopy. For mass loss, the inhibition efficiency varied from 83 to 88% according to the increase in concentration. For the electrochemical tests, the efficiency variation ranged from 62 to 90% with increasing amino acid concentration. Furthermore, a simulation analysis using quantum chemical calculations within the scope of Density Functional Theory (DFT) revealed that histidine’s nucleophilic character is crucial for its corrosion inhibitory capacity in an aqueous medium at pH 7. The inhibition efficiency increased with increasing concentration in a neutral medium, following the Langmuir isotherm for the adsorption of L-histidine. Additional studies were carried out using Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TGA). Analysis of the substrate surface by scanning electron microscopy (SEM) showed greater preservation with the addition of L-histidine, confirming its adsorption on the steel. Atomic Force Microscopy (AFM) also demonstrated an improvement in surface roughness in the presence of amino acids compared to the medium without an inhibitor.
评估氨基酸 L-组氨酸作为 1018 碳钢在氯化钠水溶液中的缓蚀剂的作用
根据成分中含有咪唑的抑制剂的有效性,研究了具有咪唑环的氨基酸 L-组氨酸作为 AISI 1018 碳钢在氯化物溶液中的缓蚀剂。由于有关这种氨基酸在中性环境中的研究较少,因此本研究选择了中性环境。对 250、500 和 1000 ppm 的浓度进行了评估。采用了多种方法来确定抑制效果,包括质量损失、开路电位、线性电位极化和电化学阻抗光谱。在质量损失方面,随着浓度的增加,抑制效率从 83% 到 88% 不等。在电化学测试中,随着氨基酸浓度的增加,效率变化范围为 62% 至 90%。此外,利用密度泛函理论(DFT)范围内的量子化学计算进行的模拟分析表明,组氨酸的亲核特性对其在 pH 值为 7 的水介质中的缓蚀能力至关重要。 在中性介质中,根据 L-组氨酸的朗缪尔吸附等温线,缓蚀效率随浓度的增加而增加。此外,还使用傅立叶变换红外光谱法(FTIR)和热重分析法(TGA)进行了研究。通过扫描电子显微镜(SEM)对基底表面进行的分析表明,加入 L-组氨酸后,基底表面的保存率更高,这证实了 L-组氨酸对钢的吸附作用。原子力显微镜(AFM)也显示,与不添加抑制剂的介质相比,添加氨基酸的介质表面粗糙度有所改善。
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
Crystals
Crystals CRYSTALLOGRAPHYMATERIALS SCIENCE, MULTIDIS-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
4.20
自引率
11.10%
发文量
1527
审稿时长
16.12 days
期刊介绍: Crystals (ISSN 2073-4352) is an open access journal that covers all aspects of crystalline material research. Crystals can act as a reference, and as a publication resource, to the community. It publishes reviews, regular research articles, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on article length. Full experimental details must be provided to enable the results to be reproduced. Crystals provides a  forum for the advancement of our understanding of the nucleation, growth, processing, and characterization of crystalline materials. Their mechanical, chemical, electronic, magnetic, and optical properties, and their diverse applications, are all considered to be of importance.
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