Time evolution and temperature studies of 2-(hydroxymethyl)benzothiazole and its mixture with KI as an inhibitor for steel in 15 % HCl

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-05-10 DOI:10.1016/j.molliq.2025.127762

Aeshah H. Al-Amri , Ikenna B. Onyeachu , John O. Anyanwu , Edith U. Ofor

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引用次数: 0

Abstract

In this work, we undertake the time-evolution and temperature assessment of 2-(hydroxymethyl)benzothiazole (HMBT) and its mixture with potassium iodide (KI) as a corrosion inhibitor for C1018 carbon steel in 15 % HCl. According to weight loss measurements at 25 °C, the inhibition efficiency of HMBT initially decreases from 74 % to 28 % between 6 and 24 h, but subsequently increases to 61 % after 72 h immersion, following a transformation from Temkin adsorption to a Langmuir adsorption mode. The presence of 5 mM KI significantly alters the adsorption mode of HMBT by favoring a Langmuir adsorption mode and ensuring only a minimal decrease in efficiency from 94 % (after 6 h) to 81 % (after 72 h). At 60 °C the inhibition efficiency of HMBT and HMBT + KI increases to 79 and 99 %, respectively, by the Langmuir adsorption mode. The mechanism of HMBT inhibition and its modification by KI was confirmed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). FTIR characterization confirmed that HMBT blocks the corrosion via an adsorption mechanism, such that the CC and CN groups act as adsorption sites, based on computational modeling. KI also improved HMBT ability to protect surface microstrucrual degradation, based on atomic force microscopy (AFM) characterization.

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2-（羟甲基）苯并噻唑及其与KI混合作为15% HCl中钢的缓蚀剂的时间演变和温度研究

在这项工作中，我们进行了2-（羟甲基）苯并噻唑（HMBT）及其与碘化钾（KI）的混合物作为C1018碳钢在15% HCl中的缓蚀剂的时间演变和温度评估。根据25℃下的失重测量，HMBT的抑制效率在6 ~ 24 h之间从74%下降到28%，但在浸泡72 h后，从Temkin吸附模式转变为Langmuir吸附模式，抑制效率随后上升到61%。5 mM KI的存在显著改变了HMBT的吸附模式，有利于Langmuir吸附模式，并确保效率从94%（6小时后）降到81%（72小时后）。在60℃时，HMBT和HMBT + KI的Langmuir吸附效率分别提高到79%和99%。通过电化学阻抗谱（EIS）和动电位极化（PDP）证实了KI对HMBT的抑制作用及其改性机理。FTIR表征证实，基于计算模型，HMBT通过一种吸附机制阻止腐蚀，即CC和CN基团作为吸附位点。基于原子力显微镜（AFM）表征，KI还提高了HMBT保护表面微结构降解的能力。

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

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.