Evaluation of the inhibitive effect of some plant extracts on the acid corrosion of mild steel (original) (raw)
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Evaluation of Inhibitive Performance of Some Plants Extracts on Low Carbon Steel Corrosion
Studies in Engineering and Technology, 2014
The corrosion inhibitive potential of Plumeria Alba, Blighia Sapida and Secamone Afezeli plants extracts on heat-treated and non-heat-treated mild steel samples immersed in different concentrations of hydrochloric acid (HCl) were investigated using weight loss technique. The mild steel samples were cut and prepared for the corrosion test in the acid media mixed with the plant extracts obtained by natural drying, grinding and chemical extraction using hexane. The plants were collected from the botanical garden of University of Lagos, Nigeria. Samples of the mild steel were weighed before immersion and at regular interval of 7 days for a period of 56 days after immersion. The experiment was repeated using 0.1 M and 0.2 M of an inorganic inhibitor. Results obtained showed that the extract of Blighia Sapida exhibited the highest inhibitive power, while annealed samples have the least corrosion rate in the Hcl solution.
Corrosion Inhibition of Carbon Steel in HCl Solution by Some Plant Extracts
International Journal of Corrosion, 2012
The strict environmental legislations and increasing ecological awareness among scientists have led to the development of "green" alternatives to mitigate corrosion. In the present work, literature on green corrosion inhibitors has been reviewed, and the salient features of our work on green corrosion inhibitors have been highlighted. Among the studied leaves, extract Andrographis paniculata showed better inhibition performance (98%) than the other leaves extract. Strychnos nuxvomica showed better inhibition (98%) than the other seed extracts. Moringa oleifera is reflected as a good corrosion inhibitor of mild steel in 1 M HCl with 98% inhibition efficiency among the studied fruits extract. Bacopa monnieri showed its maximum inhibition performance to be 95% at 600 ppm among the investigated stem extracts. All the reported plant extracts were found to inhibit the corrosion of mild steel in acid media.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Inhibition of corrosion of mild steel in hydrochloric acid by natural plant leaves extract of of Bahunia Varigata (Aapta), Azadirachta Indica (Neem), Pongamia Pinnata (Karanj), Santalum Album (Sandal Wood) and Astonia Scholaris (Saptparni) has studied using weight loss measurement. It was, found that the leaves extract act as a good corrosion inhibitor for mild steel in all concentrations of the extract. The inhibition action depends on the concentration of the leaves extract in the acid solution. Results for weight loss measurements indicate that inhibition efficiency increase with increasing inhibitor concentration. Extract of natural plants is one of the most important metallic corrosion inhibitors. They are readily available, nontoxic, environmentally friendly, biodegradable, highly efficient, and renewable. Several organic compounds with heteroatom such as N, O, S and P present in the plant extracts are, adsorbed directly onto the metals surface through polar atoms and thereby forming the protective layer. Plants represent a class of interesting source of compounds currently being, explored for use in metal corrosion protection in most systems, as possible replacement of toxic synthetic inhibitors. This paper discusses the different types of natural green plant leaves extract inhibitors for corrosion control of mild steel in acid medium.
Plant extracts as corrosion inhibitors of mild steel in HCl solutions
Surface Technology, 1985
The effects of various plant extracts on the dissolution of mild steel in HC1 solutions were studied. The additives investigated were Papaia, Poinciana pulcherrima, Cassia occidentalis and Datura stramonium seeds and Papaia, Calotropis procera B, Azydracta indica and Auforpio turkiale sap. Weight-loss determinations and electrochemical measurements were performed. It was found that all extracts except those of Auforpio turkiale and Azydracta indica reduced the corrosion of steel with an efficiency of 88%-96% in 1 N HC1 and with a slightly lower efficiency in 2 N HC1. Both the cathodic evolution of hydrogen and the anodic dissolution of steel are inhibited. We believe that the inhibition action is mostly due to the products of the hydrolysis of the protein content of these plants.
Effect of plant extracts on corrosion rate of mild steel in acidic medium
2.5ml Ethanol is used on plant extracts of locus bean (parkiabiglobosa) and banana sap (musaparadisiaca) as corrosion inhibitors for mild steel in 1M dilute HCl was investigated using weight loss techniques. Corrosion tests were first carried out for 1 and 3 hrs of immersion time respectively at various concentrations of extracts (0.5ml, 1.0ml, 1.5ml, 2.0ml and 2.5ml) and 2.5ml were used as corrosion inhibitors and at different temperatures (38oC, 45oC and 55oC). Results showed that the minimum corrosion rate obtained for 1 hr at 38oC with extract of Pakiabiglobosa is 0.85×10-4g/cm3/min and efficiency of 18.75% for 1hr, while at 55oC the corrosion rate was 4.37×10-4 g/cm3/min and efficiency of 33%. With ethanol extract of banana sap, minimum corrosion rate and efficiency recorded at 38°C were (4.16×10-4 g/cm3/min and efficiency of (22.1%), while at 55oC they were (0.83×10-4 g/cm3/min) and (7.6%) respectively. From these results, it is concluded that extracts of locust bean and banana sap can be successfully used as corrosion inhibitors in specified acidic medium.
The Efficacy of Plant Inhibitors as Used against Structural Mild Steel Corrosion: A Review
Portugaliae Electrochimica Acta
MS acceptability for nowadays structural construction is premised on its availability and low cost. However, due to MS poor corrosion resistance, most especially in acidic and alkaline environments, there have been increasing concerns about its use. The use of inhibitors, as proposed by different researchers, mitigates MS CR, thus reducing the economic losses experienced by all chief users of this alloy. In recent years, scientists have focused on green inhibitors obtained from plant, fruit and vegetable extracts, and essential oils. Besides being environmentally friendly, in terms of corrosion resistance, plant extracts are becoming increasingly important, due to their low cost and toxicity, and high availability. Additionally, they are rich in organic compounds with polar atoms, such as O, P, S and N, containing multiple bonds in their molecules, through which they can adsorb onto the metal surface, forming a protective film, by various adsorption isotherms. This paper provides a review on research works done so far on MS corrosion control by naturally occurring plant extracts as corrosion inhibitors, in both acidic and alkaline environments, where this alloy is mainly applied.
Corrosion and plants extracts inhibition of mild steel in HCl
Corrosion and plants extracts inhibitive protection of mild steel specimens immersed in 0.5 M hydrochloric acid was investigated at ambient temperature by gravimetric and metallographic methods. Extracts of kola plant and tobacco in different concentrations were used as 'green' inhibitors. This paper reports the results obtained from the weight loss method, calculated corrosion rates, inhibitor efficiencies and the metallographic observations from metallurgical microscopy. Addition of different concentrations of the plants extracts gave considerable reduction in the weight loss and in the corrosion rate of the test samples. This apparent corrosion inhibition was associated with the protective film provided on the steel's surface by the complex chemical constituents of the plants extracts. Effective protection of the mild steel was achieved more from the tobacco extract and also from the extract of kola leaf.
Studies on the inhibitive effect of Occimum viridis extract on the acid corrosion of mild steel
Materials chemistry and physics, 2006
Corrosion inhibition of mild steel in 2 M HCl and 1 M H 2 SO 4 by leaf extracts of Occimum viridis (OV) was studied using the gasometric technique at temperatures of 30 and 60 • C. The results indicate that the extracts inhibit the corrosion process in both acid media and inhibition efficiency increased with concentration. Synergistic effects increased the inhibition efficiency in the presence of halide additives namely KCl, KBr, KI. Temperature studies revealed a decrease in efficiency with rise in temperature and corrosion activation energies increased in the presence of the extract, probably implying that physical adsorption of cationic species may be responsible for the observed inhibition behaviour. Comparative analysis of the inhibitor adsorption behaviour in 2 M HCl and 1 M H 2 SO 4 as well as the effect halide additives suggest that cationic species may not be the only constituents responsible for the inhibiting action of the extract.
Study on Corrosion Inhibitor in Mild Steel by Various Habitual Plant Extract -Review
International journal of chemical concepts, 2016
The inhibitor potentials of discrete plant extract was exploration by studying the corrosion behaviour of mild steel immersed in 2 M H 2 SO 4 solution containing varied concentration of plant extract. Inhibitor efficiency of acid extract of plant such as musa sapientium peel, Emblica officinalist leaves and Azadirachta indica leaves as corrosion inhibitor for mild steel. The corrosion inhibition of the extract was criticized by using weight loss method, gasometric method, thermometric method and surface analysis studies. The inhibitor efficiency increased with increase in inhibitor concentration and decreased with temperature suggesting the occurrence of physical absorption and the highest % IE was obtained. As a result of literary work about performance was reviewed to identify the factor affecting the performance of corrosion inhibitor.Inhibitor efficiency of the extract is found to vary with concentration , temperature , period of immersion and pH.Value of active energy of the inhibited corrosion reaction of mild steel are greater than the value obtained for the blank solution.The mild steel surface in the absence and presence of the inhibitor was analysed by scanning electron microscopy(SEM) and the protective film have been analysed by Atomic force microscopic (AFM).