Evaluation of curcuma domestica loir and alpinia galanga extract as an eco-friendly corrosion inhibitor for carbon steel in 0.5 M HCl medium

Saftu, Noor Adilah (2022) Evaluation of curcuma domestica loir and alpinia galanga extract as an eco-friendly corrosion inhibitor for carbon steel in 0.5 M HCl medium. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Carbon steel is most often used to meet the needs of steel users. The material has great flexibility and it is best shown by the numerous applications of steel. As we all know, metal corrosion is one of the most disruptive phenomena, causing massive economic damage in the automobile, marine, oil and gas, and aerospace industries in particular. Corrosion inhibitors are compounds that are added to or applied to a corrosive medium in small amounts on metal surfaces, lowering the corrosion tendency. Sometimes there are limits to the use of typical corrosion inhibitors because they are based on harmful compounds for human health, such as treatments using chromium. Recent approaches benefit from organic components derived from expired pharmaceuticals, green inhibitor extracts and even plant extracts. The main aim of this study is to evaluated of curcuma domestica loir and alpinia galanga extract as eco-friendly corrosion inhibitor for carbon steel in 0.5 M HCl medium. The objectives are to investigate the influence of the immersion period on the inhibition efficiency of the green inhibitors. To evaluate the inhibition efficiency of curcuma domestica loir and alpinia galanga extract as plant-based green inhibitor for low carbon steel in an acidic medium. To compare the performances of the selected green inhibitors in preventing corrosion in low carbon steel. For this research we had used low carbon steel as substrate has immerse in 0.5 M HCl added with curcuma domestica loir and alpinia galanga extract. Immersion test sample has been divided into three sample which is HCl added with turmeric and galangal extract. Each sample contain six low carbon steel specimen and has observed within 7, 14, 21, 28 and 35 days. The specimen has been takeout followed by the week that we have decided and the result has been calculated by weight loss measurement and corrosion rate. Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX) has been analyzed in this study. The SEM study of the low carbon steel surface has then establish the effect on corrosion inhibition of the environmentally friendly inhibitor. The results at days 35 of total weight lossmeasurementfor three solution is 1.14gram, 0.731gram and 0.795gram, corrosion rate for three solution is 0.0154mm/year, 0.0099mm/year and 0.0107mm/year and inhibitor efficiency for turmeric is 35.87% and galangal is 30.26% has been proven to reduce the rate of corrosion of carbon steel by adding a turmeric and galangal environmentally friendly inhibitor. The efficiency of the inhibition has thus been increased when the turmeric and galangal extract concentration are increases. The low carbon steel observation surface SEM and EDX analyzes showed that specimen surfaces in 0.5 M HCl solution had a lot more corroded pitting, compared to the turmeric and galangal medium on specimen surfaces. The green inhibitor is to be used in systems of oil and gasses, such as boilers, pipelines, pressure tanks and pressure vessels. The best green inhibitor is turmeric, based on the maximum value of corrosion rate and highest value of inhibitor efficiency.

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