{"title":"Synergistic Inhibition Between Polyvinylpyrollidone and Iodide Ions on Corrosion of Aluminium in HCl~!2008-10-03~!2008-11-08~!2009-01-06~!","authors":"S. Umoren, I. Obot, I. Igwe","doi":"10.2174/1876503300902010001","DOIUrl":null,"url":null,"abstract":"The effect of iodide ions on the corrosion inhibition of aluminium in 2M HCl in the presence of polyvinylpy- rollidone (PVP) was studied using gasometric (hydrogen evolution) technique at 30-60 o C. Results obtained showed that PVP effectively reduces the corrosion rates of aluminium in the acid medium. Inhibition efficiency (%I) increases with increase in concentration of PVP. Increase in temperature increases corrosion rate but decreases inhibition efficiency. The addition of iodide ions enhanced the inhibition efficiency of PVP considerably. Adsorption of PVP and PVP + KI fol- lowed Temkin adsorption isotherm. Phenomenon of physical adsorption is proposed from the obtained E a and G ads values. The synergistic parameter (S1) obtained was found to be greater than unity, which indicates that the enhanced in- hibition efficiency caused by the addition of iodide is only due to synergistic effect.","PeriodicalId":420093,"journal":{"name":"The Open Corrosion Journal","volume":"43 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2009-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"38","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Open Corrosion Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2174/1876503300902010001","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 38
Abstract
The effect of iodide ions on the corrosion inhibition of aluminium in 2M HCl in the presence of polyvinylpy- rollidone (PVP) was studied using gasometric (hydrogen evolution) technique at 30-60 o C. Results obtained showed that PVP effectively reduces the corrosion rates of aluminium in the acid medium. Inhibition efficiency (%I) increases with increase in concentration of PVP. Increase in temperature increases corrosion rate but decreases inhibition efficiency. The addition of iodide ions enhanced the inhibition efficiency of PVP considerably. Adsorption of PVP and PVP + KI fol- lowed Temkin adsorption isotherm. Phenomenon of physical adsorption is proposed from the obtained E a and G ads values. The synergistic parameter (S1) obtained was found to be greater than unity, which indicates that the enhanced in- hibition efficiency caused by the addition of iodide is only due to synergistic effect.