The issue of corrosion is become a huge economical, environmental and health security concern. Besides, the protection of metallic surfaces against corrosion produces pollution due to the use of chromates and phosphates. The news European environmental instructions forbid the use of these very polluting components. Consequently, new components have to be found to respect this law. Bio-based components would be a solution and in particular the use of chitosan. Chitosan fit rather well for active coating purposes. Due to its physicochemical properties such as, antimicrobial activity, biodegradability and excellent film-forming ability, chitosan appears as a good alternative to conventional, man-made coating systems to prevent corrosive degradation of materials. Moreover its abundance in nature and its recovery of waste make an even more interesting product. But chitosan suffers from two inherent weaknesses as a coating material namely high hydrophilicity and more or less adhesive strength. The aim of this work is to attach some adhesive function on chitosan then coatings have been tested against corrosion by using local electrochemical impedance spectroscopy.
展开▼
