Using Lignin and Tannin as Green Corrosion Inhibitors for Carbon Steel Petrolum Tanks

¹ Department of chemical and Petrochemical Engineering, College of Engineering, University of Anbar, Ramadi, 00964, Iraq
² Department of Optics Techniques, Dijilah University College, Al-Al-Masafi Street, Al-Dora, Baghdad, 00964, Iraq
³ Materials Research Directorate, Ministry of Sciences and Technology, Baghdad, 00964 Iraq
⁴ Materials Technology Research Group (MaTRec), School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia

^* Corresponding author: amel.naji@duc.edu.iq

Abstract

The best strategy for combating corrosion is verified by recent studies that employ organic green corrosion inhibitors isolated from plant extracts that are biodegradable, environmentally friendly, suitable priced, and safe. This current research conducted various experiments on Kraft lignin extracted from Iraqi date palm fronds base (DPFB) and tannin to inhibit corrosion. The corrosion monitoring technique includes the weight loss method and surface analysis by optical microscope. The extracted lignin was characterized using 13CNMR. The results showed clear evidence of Kraft lignin’s and tannin's corrosion inhibition behavior of carbon steel alloys immersed in 0.5 M HCl solutions. As increasing concentration, Kraft lignin and tannin became more effective inhibitors. Furthermore, Kraft lignin showed more effectiveness as a corrosion inhibitor than tannin.