Corrosion inhibition using lignin of sugarcane bagasse

The quality of ferrous metals may decrease due to corrosion. The corrosion rate can be inhibited using inhibitors derived from organic compounds. Sugar cane waste from the sugar industry contains lignin that can be used as an environmentally friendly organic inhibitor, also called green inhibitor or eco-friendly inhibitor. The present article describes the use of green eco-friendly lignin natural polymer as corrosion inhibitor on the surface of ferrous metal in acidic media. Lignin was isolated from bagasse by acidification methods and characterized by FTIR to confirm the functional groups. The inhibition effectiveness of lignin against corrosion rate was observed by varying the concentration of lignin and metal immersion time in acidic medium. By using weight-loss method, it was found that the optimum inhibition effectiveness was 80.79% using the lignin concentration of 10 g/L and metal immersion time for 6 hours. The corrosion rate decreases with increasing lignin concentration of bagasse and length of immersion time.