Self-healing CeO2-chitosan nanocomposite coating on aluminum alloy

Self-healing CeO2-chitosan (CeO2-CHIT) nanocomposite coatings were deposited on AA5083-H321. The influence of deposition parameters on the corrosion behavior were studied by using potentiodynamic polarisation and electrochemical impedance spectroscopy. SEM, TEM and FTIR were used to characterize the resulting composites. Itwas concluded that upon increasing the cerium ion concentration in chitosan (CHIT) films from 1 to 5 mM, corrosion current density values significantly decrease. Also, the results revealed that the presence of CeO2 nanoparticles inCHIT coatings doped with Ce (III) ions (CHIT-CE) significantly enhanced the corrosion resistant of the coating. During the first few hours of immersion, the impedance of the coating decreased and the corrosion resistance dropped. However, with extended immersion, the impedance showed high impedance value. This result shows that this coating exhibits ‘self-healing type behavior

Keywords:

Self-Healing , Environmentally Friendly , Chitosan , Cerium oxide , Nanocomposite