Inhibitive and adsorption properties of ethanol extract of Hibiscus sabdariffa calyx for the corrosion of mild steel in 0.1 M HCl

Green Chemistry Letters and Reviews

Nnabuk Okon Eddy¹ 

关键词: corrosion;    green inhibitor;    Hibiscus sabdariffa calyx;   

DOI  :  10.1080/17518253.2011.578589

学科分类：化学（综合）

来源: Taylor & Francis

【 摘 要 】

The inhibitive and adsorption properties of ethanol extract of Hibiscus sabdariffa calyx were studied using gravimetric, gasometric, thermometric, and Fourier transform infrared methods of monitoring corrosion. The results obtained indicated that ethanol extract of Hibiscus sabdariffa calyx is a good adsorption inhibitor for the corrosion of mild steel in HCl solutions. The adsorption of the inhibitor on mild steel surface is spontaneous and supports the Langmuir adsorption model. From the calculated values of free energy of adsorption, the activation energy, and the variation of inhibition efficiency with temperature, it can be concluded that the initial mechanism for the adsorption of ethanol extract of Hibiscus sabdariffa calyx on mild steel surface is physical adsorption. Analysis of spectra obtained from the Fourier transform infrared spectrophotometer indicated that there is an interaction between iron in mild steel and the inhibitor.

【 授权许可】

Unknown