Corrosion inhibition performance of different bark extracts on aluminium in alkaline solution

详细信息    查看全文

• 作者：Namrata Chaubey^a ; Savita^a ; Vinod Kumar Singh^a ; M.A. Quraishi^b ; ^{maquraishi.apc@itbhu.ac.in} ; ^{maquraishi@rediffmail.com}
• 关键词：Aluminium Alloy ; EIS ; Corrosion inhibition ; SEM ; AFM
• 刊名：Journal of the Association of Arab Universities for Basic and Applied Sciences
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：22
• 期：Complete
• 页码：38-44
• 全文大小：1745 K
• 卷排序：22

文摘

The present work shows the effect of stem bark extracts of three trees namely Moringa oleifera (MO), Terminalia arjuna (TA) and Mangifera indica (MI) on the corrosion behaviour of Aluminium Alloy (AA) in 1 M NaOH. The inhibition performance was studied by using gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. Among these extracts, MO exhibited the maximum inhibition efficiency η (%) of 85.3% at 0.6 g/L at 303 K. Polarization measurement showed that all the examined extracts are of mixed-type inhibitors. Langmuir’s adsorption isotherm was found to be best fit. Morphology of the surface was examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM) which confirmed the existence of a protective film of inhibitor molecule on AA surface.