STUDY OF SYNERGISTIC INHIBITIVE PROPERTIES OF ETHANOLIC EXTRACTS OF CALATROPIS PROCERA ON THE CORROSION OF MILD STEEL IN HCl SOLUTION (2025)

Synergistic Effect of Calotropis Plant in Controlling Corrosion of Mild Steel in Basic Solution

Journal of The Chilean Chemical Society, 2009

The alcoholic extracts of leaves, latex and fruit from the Calotropis procera and Calotropis gigantea are tested for corrosion inhibition in basic solution by mass loss method and thermometric method. In the present investigation the extract reduces the corrosion rate of mild steel in basic solution. The inhibition efficiency increases as the extract concentration is increased. The alcoholic extract of Calotropis is found effective corrosion inhibitor in basic media and give up to 80.89% efficiency.

Evaluation of the inhibitive effect of some plant extracts on the acid corrosion of mild steel

Corrosion Science, 2008

Corrosion inhibition of mild steel in 2 M HCl and 1 M H 2 SO 4 by extracts of selected plants was investigated using a gasometric technique at temperatures of 30 and 60°C. The studied plants materials include leaf extracts Occimum viridis (OV), Telferia occidentalis (TO), Azadirachta indica (AI) and Hibiscus sabdariffa (HS) as well as extracts from the seeds of Garcinia kola (GK). The results indicate that all the extracts inhibited the corrosion process in both acid media by virtue of adsorption and inhibition efficiency improved with concentration. Synergistic effects increased the inhibition efficiency in the presence of halide additives. Inhibition mechanisms were deduced from the temperature dependence of the inhibition efficiency as well as from assessment of kinetic and activation parameters that govern the processes. Comparative analysis of the inhibitor adsorption behaviour in 2 M HCl and 1 M H 2 SO 4 as well as the effects of temperature and halide additives suggest that both protonated and molecular species could be responsible for the inhibiting action of the extracts.

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).

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.

Inhibitory action of extract of ankado (Calotropis gigantea) leaves on mild steel corrosion in hydrochloric acid solution

The influence of Ankado leaves extract on corrosion through mild steel in 1M HCl has been studied using weight loss measurements and electrochemical techniques. The inhibition efficiency of Ankado leaves was found to vary with concentration, temperature and immersion time. Good inhibition efficiency (IE) was evidenced in acid solutions, the inhibition efficiency was found to be 96.10% in 1M HCl of the 1.25% inhibitor concentration. The adsorption of these compounds on the steel surface for acid was found to obey Temkin s adsorption isotherm. The values of activation energy and free energy of adsorption indicated physical adsorption on mild steel surface. The potentiodynamic polarization data have shown that compounds studied are mixed type inhibitors.

Inhibitive Potential of Prosopis Africana on Corrosion of Low Carbon Steel in 1M Hydrochloric Acid Medium

Recently, there is quest for the use of inexpensive, non-toxic, non-biodegradable, readily available and environmentally acceptable corrosion inhibitor. Studies have shown that these properties could be achieved through the use of plants as inhibitor. Inhibiting effect of Prosopis Africana (Iron Tree) seed extracts were assessed on a sample of low carbon steel in 1M HCl with varying proportion of the seed extract using gravimetric, Tafel polarization and gasometrical measurement techniques. The results show that weight loss/corrosion rate decreases with increase in the extracts' concentrations. Good inhibiting efficiency of Prosopis Africana extracts with optimum inhibiting efficiency of 97.7% at 1.0 g/l after 120 hours exposure in gravimetric measurement was attained. TAFEL polarization results revealed that the Prosopis Africana extract shows that the corrosion current density decreases with the increase in the concentration of the extract. The extract is found suitable as green inhibitor for corrosion of low carbon steel in the studied medium.

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.

Plant Extracts as Corrosion Inhibitors for Mild Steel in HCl Media – Review I

International Journal of Corrosion and Scale Inhibition, 2021

Due to fact that most of the chemical compounds, are called inhibitors, that prevent the corrosion of metals and alloys are toxic and harmful for human health and environment. Therefore, scientists have focused on a new class of inhibitors such as plant extracts, fruit and vegetable extracts, essential oils in recent years. In addition to being environmentally friendly in preventing corrosion, plant extracts are getting more and more important because they are cheap, less toxic and easy to obtain. Therefore, the usage of plant extracts as corrosion inhibitors is the subject of many researches in recent years. Plant extracts contain many organic compounds, having polar atoms such as O, P, S and N. These are adsorbed on the metal surface by these polar atoms, and protective films are formed, and various adsorption isotherms are obeyed. Mild steel has been the mostly widely used alloy due to the importance of industrial applications such as mining, cleaning of boilers, oil well tubes and metal processing equipment. Some acids such as hydrochloric acid and sulphuric acid are used for pickling mild steel and industrial cleaning and acid descaling. Therefore, the corrosion of mild steel in these acids is objectionable. In this review as the recent studies regarding as plant extracts as eco-friendly corrosion inhibitors for mild steel in hydrochloric acid media have been summarized.

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.

(Calamansi) Citrofortunella Microcarpa Rind Extract As Plant Derived Green Corrosion Inhibitor For Mild Steel In 1.0M Hcl

IOP Conference Series: Materials Science and Engineering

The inhibitive action of extracts from Citrofortunella microcarpa (Calamansi) peels on mild steel in 1.0M HCl solution has been studied using the weight-loss method, electrochemical method, and SEM-EDX analysis. The measurements showed that calamansi peels have good inhibition properties. Weight loss results suggest that inhibitive efficiency increases as the concentration increases. It was also found that the adsorption stabilizes at 72 hours and degrades at longer immersion times. SEM studies of the immersed mild steel showed the decreasing extent of corrosion attack on mild steel at an increasing ratio of inhibitor, while EDX analysis shows the reduction of the formation of corrosion products, suggesting the formation of inhibitor film on the mild steel surface. The Calamansi peel extract inhibitor obeys the Langmuir adsorption isotherm model and the mode of adsorption was found to be physical and spontaneous. The results of the electrolysis technique have shown the favoring of inhibition in cathodic reactions.