Corrosion Inhibition by Flower Extracts - At a Glance

Raj Susai, A. S. Prabha, V. N, Umasankareswari T, Krishnaveni A, Jeyasundari J, K. K, H. B. Sherine, N. R. Devi
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Abstract

Flower extract are ecofriendly corrosion inhibitors. They have been used to control corrosion of mild steel, copper and aluminium in various media. The mechanistic aspects have been investigated by electrochemical studies such as polarisaiton study and AC impedance spectra. The protective film has been analysed by FTIR, SEM, EDX and AFM. The adsorption isotherms isotherms being obeyed are Langmuir, Temkin and Freundlich adsorption isotherms. The flowers extract primarily function as mixed type of inhibitors. The active principles mainly present in colored flowers are anthocyanins, and carotenoids. They contain polar groups such as hydroxyl, methoxy and ether. These ingredients coordinate with the metal ions on the metal surface through oxygen atom, benzene ring and conjugated double bonds. The protective film formed on the metal surface controls the corrosion process. Keywords: Corrosion Inhibition; Flower Extract; AFM; SEM; FTIR; Isotherms; Green Inhibitors
花卉提取物的缓蚀作用-概览
花提取物是环保型缓蚀剂。它们已被用于控制低碳钢、铜和铝在各种介质中的腐蚀。机理方面已通过电化学研究,如极化研究和交流阻抗谱进行了研究。用FTIR、SEM、EDX和AFM对保护膜进行了分析。吸附等温线遵循Langmuir、Temkin和Freundlich吸附等温线。花提取物主要起混合型抑制剂的作用。有色花中的主要活性成分是花青素和类胡萝卜素。它们含有极性基团,如羟基、甲氧基和醚。这些成分通过氧原子、苯环和共轭双键与金属表面的金属离子配合。在金属表面形成的保护膜控制腐蚀过程。关键词:缓蚀;花中提取;AFM;扫描电镜;红外光谱;等温线;绿色的抑制剂
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