Inhibitory action of aqueous coffee ground extracts on the corrosion of carbon steel in HCl solution

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• 作者：Vanessa Vasconcelos Torres^a ; Roberto Salgado Amado^a ; Camila Faia de Sá ; ^a ; Tatiana Lopez Fernandez^a ; Carlos Alberto da Silva Riehl^b ; Alexandre Guedes Torres^c ; Eliane D’ ; Elia^a ; ^{eliane@iq.ufrj.br"" rel=""nofollow}
• 关键词：A. Steel ; B. EIS ; B. Polarisation ; B. Weight loss
• 刊名：Corrosion Science
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：53
• 期：7
• 页码：2385-2392
• 全文大小：718 K

文摘

The effects of aqueous extracts of spent coffee grounds on the corrosion of carbon steel in a 1 mol L⁻¹ HCl were examined. Two methods of extraction were studied: decoction and infusion. The inhibition efficiency of C-steel in 1 mol L⁻¹ HCl increased as the extract concentration and temperature increased. The coffee extracts acted as a mixed-type inhibitor with predominant cathodic effectiveness. In this study, the adsorption process of components of spent coffee grounds extracts obeyed the Langmuir adsorption isotherm. The chlorogenic acids isolated do not seem to explain the corrosion inhibition observed during the use of the coffee extracts.