Corrosion Inhibition Of Mild Steel In Natural Seawater By Snow Crab (Chionoecetes Opilio) Peptidic Extracts. Marine Peptides As Corrosion Inhibitor

In Canada, about 30 000 tons of marine by-products from snow crab (Chionoecetes opilio) fisheries are generated annualy and currently disposed in landfills. These co-products contain biopolymers, such as peptide extracts, and some are known to interact with metallic surfaces and have an antibacterial activity. These properties suggest that snow crab peptide extracts (SCPE) could act as corrosion inhibitor, as well as by adsorption on the metallic surface as by the inhibition of microbially induced corrosion (MIC). Inhibition effect of SCPE has been investigated by electrochemical measurements and the covering of metal surface by corrosion products and biofilm was monitored by scanning electron microscopy. Corrosion inhibition efficiency of SCPE has been demonstrated over 10 days and architectural changes of biofilm were observed during the same period. This study shows that SCPE have potentially a direct effect by adsorption on the metal and an undirect effect by the structural modification of biofim which suggest that SPCE may modify MIC.