{"title":"Influence of Cissus populnea stem extract on kinetics and thermodynamics of mild steel corrosion in acidic medium","authors":"H. F. Chahul, David T. Orhemba, T. Gbadamosi","doi":"10.2478/auoc-2019-0003","DOIUrl":null,"url":null,"abstract":"Abstract The inhibition of mild steel corrosion in 1.0 M HCl and 0.5 M H2SO4 by Cissus populnea stem extract was investigated using weight loss measurements in the temperature range of 303 – 333 K. Results from the study revealed that Cissus populnea stem extract inhibited the corrosion of mild steel in both acid media. Inhibition efficiency of the stem extract increased with increase in the extract concentration but decreased with immersion time. The kinetics of the reaction aligned with a first order type. Thermodynamics investigations showed that Cissus populnea extract is adsorbed on the steel surface through physical interactions, and the adsorption process was endothermic and spontaneous. Langmuir, Freundlich and Temkin isotherm models best described the adsorption mechanism of the stem extract on the steel surface.","PeriodicalId":19641,"journal":{"name":"Ovidius University Annals of Chemistry","volume":"18 1","pages":"14 - 20"},"PeriodicalIF":1.0000,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ovidius University Annals of Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2478/auoc-2019-0003","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 4
Abstract
Abstract The inhibition of mild steel corrosion in 1.0 M HCl and 0.5 M H2SO4 by Cissus populnea stem extract was investigated using weight loss measurements in the temperature range of 303 – 333 K. Results from the study revealed that Cissus populnea stem extract inhibited the corrosion of mild steel in both acid media. Inhibition efficiency of the stem extract increased with increase in the extract concentration but decreased with immersion time. The kinetics of the reaction aligned with a first order type. Thermodynamics investigations showed that Cissus populnea extract is adsorbed on the steel surface through physical interactions, and the adsorption process was endothermic and spontaneous. Langmuir, Freundlich and Temkin isotherm models best described the adsorption mechanism of the stem extract on the steel surface.
摘要在303 ~ 333 K的温度范围内，采用失重法研究了西芹茎提取物在1.0 M HCl和0.5 M H2SO4中对低碳钢的缓蚀作用。结果表明，西芹茎提取物对低碳钢在两种酸性介质中的腐蚀均有抑制作用。茎浸膏的抑菌率随浸膏浓度的增加而增加，但随浸膏时间的延长而降低。反应动力学符合一级反应。热力学研究表明，山茱萸提取物通过物理相互作用吸附在钢表面，吸附过程是吸热自发的。Langmuir、Freundlich和Temkin等温模型较好地描述了茎提取物在钢表面的吸附机理。
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