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新型阳离子芳基联噻吩/三噻吩衍生物的化学、电化学和表面研究作为腐蚀抑制剂。

Novel cationic aryl bithiophene/terthiophene derivatives as corrosion inhibitors by chemical, electrochemical and surface investigations.

机构信息

Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.

Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt.

出版信息

Sci Rep. 2022 Feb 24;12(1):3192. doi: 10.1038/s41598-022-06863-8.

DOI:10.1038/s41598-022-06863-8
PMID:35210457
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8873503/
Abstract

Two novel bithienyl fluorobenzamidine derivatives namely, 4-([2,2':5',2''-terthiophen]-5-yl)-2-fluorobenzamidine hydrochloride salt (MA-1615), 5'-(4-amidino-3-fluorophenyl)-[2,2'-bithiophene]-5-carboxamidine dihydrochloride salt (MA-1740) were synthesized, characterized and their corrosion inhibition properties were evaluated by electrochemical methods for carbon steel (C-steel) in 1 M HCl. Experimental investigations revealed that the inhibition effectiveness of the investigated inhibitors (INHs) by the Tafel polarization method followed the order: MA-1740 (96.9%) > MA-1615 (95.6%), demonstrating higher efficiency than inhibitors of similar structure reported in the literature. The investigated bithiophene derivatives exhibit mixed-type corrosion inhibition characteristics by blocking the active sites on the surface of C-steel. EIS study revealed that the INHs behave as interface-type corrosion inhibitors. UV-Visible spectrometric measurements confirmed a complex formation between the Fe cation released during the corrosion reactions and inhibitor molecules.

摘要

两种新型双噻吩氟苯脒衍生物，即 4-([2,2':5',2''-三噻吩]-5-基)-2-氟苯脒盐酸盐（MA-1615）和 5'-(4-脒基-3-氟苯基)-[2,2'-双噻吩]-5-甲脒二盐酸盐（MA-1740），被合成、表征，并通过电化学方法在 1 M HCl 中评估了它们对碳钢（C-钢）的缓蚀性能。实验研究表明，通过 Tafel 极化法，所研究的抑制剂（INHs）的抑制效果顺序为：MA-1740（96.9%）>>MA-1615（95.6%），比文献中报道的类似结构的抑制剂效率更高。所研究的双噻吩衍生物通过阻止 C-钢表面的活性位点表现出混合类型的腐蚀抑制特性。EIS 研究表明，INHs 作为界面型腐蚀抑制剂。紫外-可见光谱测量证实了在腐蚀反应过程中释放的 Fe 阳离子与抑制剂分子之间形成了配合物。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df8a/8873503/7e12c1a84b7d/41598_2022_6863_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df8a/8873503/c7ed3afa2ab3/41598_2022_6863_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df8a/8873503/88ce663785d7/41598_2022_6863_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df8a/8873503/fa7065530870/41598_2022_6863_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df8a/8873503/266774026364/41598_2022_6863_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/df8a/8873503/5deb86ac191a/41598_2022_6863_Fig11_HTML.jpg
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