Abstract
The inhibition efficiency (IE) of an aqueous extract of henna leaves in controlling corrosion of carbon steel in seawater has been evaluated by weight-loss method. The weight loss study reveals that the formulation consisting of 8 mL of henna extract (HE) and 25 ppm of Zn2+has 94% inhibition efficiency in controlling corrosion of carbon steel in sea water. Polarization study reveals that HE and Zn2+system functions as mixed type inhibitor. AC impedance spectra reveal that protective film is formed on the metal surface. The nature of the metal surface has been analysed by FTIR spectra, SEM, and AFM analysis.
Highlights
Sea water is one of the most corroded and most abundant naturally occurring electrolytes
AC impedance spectra reveal that a protective film is formed on the metal surface
FTIR spectra reveal that the protective film consists of Fe2+-Lawsone complex and Zn(OH)2
Summary
Sea water is one of the most corroded and most abundant naturally occurring electrolytes. One of the most effective means of protecting metals and alloys surfaces from corrosion in acid and alkaline environments is the use of corrosion inhibitors [6]. Corrosion inhibitors are usually added to the acid/alkaline solution to reduce the metal loss. Studies on the use of drugs have been reported by several researchers [7, 8] Some of these corrosion inhibitors are, toxic to the environment. This has prompted the search for green corrosion inhibitors that are nontoxic and ecofriendly for metals and alloys in acidic and alkaline solutions [9]. The extracts from plant leaves, roots, and seeds have been studied and found to be cheap, environmental friendly, and good corrosion inhibitors. (4) To propose the mechanism of corrosion inhibition based on the above results
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