Investigating an environmentally in aqueous solution of potacium chloride

Abstract

Synthetic inhibitor is commonly used to decelerate corrosion rate but the application has a detrimental effect on the environment. To address this limitation, organic inhibitor, specifically Crown Flower (Calotropis Giganteen) plant, has become the preferred due to the effectiveness. Therefore, this study aimed to investigate Calotropis Giganteen plant (CGP) using the linear polarization method in sodium chloride solution on low-carbon steel to determine the potential corrosion rate and inhibitor efficiency. The CGP was extracted by drying the stems, flowers, and leaves in the sun, followed by grinding with a blender to obtain a powder form. Furthermore, the extraction process was carried out through distillation to convert Calotropis Giganteen extract (CGE) into a liquid using Soxhlet Extractor. Corrosion rate measurement was conducted using electrochemical methods in 3.5 % NaCl aqua solution and the addition of extracts at 100, 200, 300, 400, and 500 ppm concentrations. The results showed that corrosion rate of low-carbon steel in a 3.5 % NaCl aqua solution could be reduced by CGE. The corrosion rate showed a minimum of 1.197 mpy at 400 ppm with inhibitor efficiency of 66.34 %, while the highest value of 3.131 mpy was obtained at 100 ppm with efficiency of 14 %. Based on these results, CGE has shown potential as effective corrosion inhibitor for low-carbon steel in a hydrochloric acid solution.

Keywords

• Calotropis gigantea plant extract
• Corrosion inhibitor
• Linear polarization
• Low-carbon steel