The Corrosion inhibitory performance of hybridized rice-husk extract and biopolymer waste on food-compatible mild steel in acidic media
Abstract
Metal corrosion is frequently the outcome of the reactive interaction between food's corrosive components and metal alloy during processing and packaging. This study used gravimetric and depth of attack methodologies to examine performance of hybridized rice husk extract and chitosan, as a corrosion inhibitor for mild steel in 1 M HCl. Rice husk was subjected to phytochemical screening in order to choose the best material combination. Gas chromatography–mass spectrometry was then used to characterize the extract. Fourier transform infrared spectroscopy was used to characterize the corrosion film solution and chitosan synthesized from residual biopolymer fish scale. The rate at which the coupon corroded with and without rice husk extract and chitosan was assessed in relation to temperature, concentration, and time. The formation of a film over the metal surface was facilitated by the presence of polycyclic chemicals, tannins, and cellulose, thus aiding corrosion. Inhibition efficiency increased with increase in temperature and concentration of rice husk extract. Kinetic parameters showed that Langmuir isotherm is the best fit because the R2 value is close to unity. The addition of 5:1 ratio of rice husk to chitosan shows a great difference as the inhibition efficiency increase with increasing temperature to 80% inhibition efficiency
