Abstract
Corrosion control methods, especially the use of inhibitors, have gained monumental importance in the present scenario of expunging corrosion and the quest for eco-friendly reasons continues. To arrive at an inexpensive non-toxic, eco-friendly inhibitor formulations the present study on the use of Staminate Flower extract of Cocos Nucifera has been carried out by the classical weight loss measurements and electrochemical polarization measurements. The acid extract could bring out a maximum of 97.3% inhibition of mild steel corrosion in 1M HCl. Thermodynamic parameters of the corrosion process were calculated from temperature study. The adsorptive behaviour of Staminate Flower extract in acid solution may be approximated both by Langmuir and Temkin type isotherms. The results obtained by Tafel, Linear polarization resistance, and impedance spectroscopy have been correlated with the classical weight loss measurements. Values of Tafel constant ba and bc confirmed that the Staminate Flower extract acts like mixed type inhibitor. Examination of the surface of the metal in the presence of the inhibitor confirmed the deposition of inhibitor on the metal surface. The Staminate Flower extract in HCl medium efficiently inhibits the corrosion and proved to be zero cost inhibitor, eco-friendly, non-toxic, and highly economical.
Highlights
Mineral acids of various concentrations are extensively employed in various industrial processes including chemical cleaning, acid pickling, and acid descaling as well as in oil well acidification which result in corrosion
Inspection of the table reveals that the inhibition efficiency of SFCN extract enhanced to 97% at higher concentration
Inhibition efficiency of SFCN extract with immersion time increases up to 3 h furnishing 93.5% and inhibition efficiency decreases to 85% at 6 h raise up to 95% at 12 h and 97% at 24 h
Summary
Mineral acids of various concentrations are extensively employed in various industrial processes including chemical cleaning, acid pickling, and acid descaling as well as in oil well acidification which result in corrosion. The exploration of natural products of plant origin as inexpensive eco-friendly corrosion inhibitors is an essential field of study. In addition to being environmentally friendly and ecologically acceptable, plant products are cheap, readily available, and are renewable sources of materials[1]. The extracts from their leaves, barks, seeds, fruits, and roots comprise mixtures of organic compounds containing nitrogen, sulphur, and oxygen atoms and some[2,3,4,5,6] have been reported to function as effective inhibitors of metal corrosion in different aggressive environments. Recent literature has shown that plant materials, such as Opuntia extract[7], Telferia occidentalis extract[8], limonene[9], Prosopis cineraria[10], zallouh root[11], olives leaves[12], Datura stramonium[13], Gossipium hirsutum extract[14], Figus virens plant[15], Datura metel[16], Allium sativum[17], Zenthoxylum alatum[18], juice extracts of Magnifera indica (mango)[19], acidic extracts of Phyllantus amarus extract[20] is effective inhibitor for metal in aggressive solutions
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