Gelatin as a corrosion bioinhibitor at saline media from fish bone of mackerel (Scomberomorus sp)

Abstract

The purpose of this work was to learn gelatin addition to ferrous coupons at saline medium in inhibiting the corrosion process. Gelatin was produced from the fish bone of Mackerel (Scomberomorus sp) by several steps namely preparation of the raw material, demineralization, and extraction. It has been investigated that the corrosion rate declined when a higher concentration of gelatin was given. FT-IR explained the formation of protective gelatin on the metal surface. It could be concluded from the typical gelatin wavenumber especially at 1630 cm-1 amide I vibration (C=O), at 1533 cm-1 amide II vibration (N-H), at 1242 cm-1 and 3281 cm-1 for amide III (C-N and N-H stretching vibrations). UV-Vis spectroscopy revealed the existence of peptide bonds (200-250 nm) and chromophores (250-300 nm). In addition, SEM- EDX analysis explained that a smoother surface and a protective film were formed with the addition of gelatin.