International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
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A Study Of Corrosion Inhibition Efficacy Of Leaves Extract Of Solanum Xanthocarpum And Salvodera Persica On Aluminium And Mild Steel In HCl Neha Manwani1, Dr. Manoj Batra2, Dr. S.K. Arora2, Dr. R.K. Upadhyay1 1Synthesis And Surface Science Laboratory, Department Of Chemistry, S.P.C Government College Ajmer 2Material Research Laboratory, Department Of Chemistry, S.P.C Government College Ajmer
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Abstract - Weight loss and gasometric method were used to
presence of π electrons and heteroatoms due to which the inhibitor molecules have a greater adsorption efficiency on to the mild steel and aluminium surface [18].
determine the inhibitive power of Salvodera persica and Solanum xanthocarpum leaf extracts toward acid corrosion of aluminium and mild steel. Plant extracts contain mixture of compounds having oxygen, nitrogen and sulphur which are considered as eco-friendly, economic and renewable inhibitors. Chemisorption on the metal surface is due to the presence of electron rich regions and heteroatoms. It was found that the leaves extract act as good corrosion inhibitor for mild steel and aluminium at all concentrations. 0.8% leaf extract of Salvodera persica proved to be the best inhibitor with the highest inhibition efficiency of 97.83% while 0.2% extract of Solanum xanthocarpum leaves displayed the least inhibition efficiency of 26.26%.
Phytochemical screening of the ethanolic extract of Salvodera persica and Solanum xanthocarpum leaves revealed the presence of sterols, terpenes, flavonoids and saponins [19-22]. The present study aims to investigate the inhibitive properties of leaves extract of Salvodera persica and Solanum xanthocarpum on the corrosion behavior of mild steel and aluminum in HCl solution.
2. EXPERIMENTAL DETAILS 2.1 Preparation of metal specimen
Key Words- Solanum xanthocarpum; Salvodera persica;
Square size metal specimen having dimension (2.5 ×2.5×0.05) cm containing a small hole near the upper edge were employed for inhibition study. Specimens were cleaned by emery paper, washed with distilled water, dried and then weighed.
corrosion rate; weight loss, Inhibition efficiency, hydrogen evolution.
1.INTRODUCTION Mild steel finds a variety of uses in most of chemical industries due to its low cost and easy availability for fabrication of various reaction vessels, tanks, pipes etc [1,2]. Aluminium is a soft, durable, lightweight, malleable metal, nonmagnetic and non-sparking. Aluminium and its alloys are recommended for various industries, food packaging, and highly polluted places [3-5].
2.2 Preparation of plant extract The leaves were hand plucked and washed under running tap water. The leaves were air dried at room temperature for one week then they were grinded in a blender into powder form. Dried sample was placed in a thimble, which was placed inside the soxhlet extractor. Extract concentration of 0.2%, 0.4%, 0.6%and 0.8% were prepared in ethanol.
Metal tends to get corroded when exposed to acidic media which decreases its utility [6-9]. Corrosion is an irreversible interfacial reaction of a material with its environment which results in its consumption or dissolution into a component of the environment [10, 11]. Many inorganic and synthetic organic inhibitors have been extensively applied to prevent deterioration of materials but due to their toxic nature and high cost of some chemicals currently in use, it is necessary to develop environmentally acceptable and less expensive inhibitors which are biodegradable in nature [12-14].
2.3 Preparation of acid solution The solutions of different concentrations of HCl were prepared using double distilled water and using chemicals of AR grade.
3. METHODOLOGY 3.1 Weight loss method –
Extracts of natural plants is one of the most important metallic corrosion inhibitors [15]. Bio active compounds in plants include alkaloids, terpenoids, coumarins, flavonoids, nitrogen containing compounds etc.[16,17]. The corrosion inhibiting property of these compounds is due to the
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The weighed coupons were suspended with the help of glass hooks in beaker containing 50 mL of corrodent containing the inhibitor with different concentration. After sufficient exposure of time the coupons were removed and washed
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