LAUSR

Abstract Herein, nanocomposite coatings consisting of chitosan (CSNPs) and cobalt nanoparticles (CoNPs) were deposited on bare 316L stainless steel alloy (316L SS) as a bone implant. Scanning electron microscope (SEM) and energy dispersive X-ray (EDX) were applied to characterize the morphological and chemical composition of the tested nanocoatings. In-vitro degradation and hydrogen evolution behaviour of the coated samples were examined by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques, in Hank's solution containing of 1 × 10−3 M calcium hydrogen phosphate drug at pH 7.4 and temperature 37 °C. This drug used as an inhibitor for protecting the alloy surface from the corrosive medium and minimized the hydrogen evolution rate. Results showed that the di-phasic coating (CoNPs-CSNPs) gave the highest electrochemical corrosion resistance with the lowest hydrogen evolution rate in comparison to the monophasic coatings (CS-NPs & Co-NPs). These corrosion results suggested that a CoNPs-CSNPs nanocomposite coating on 316L SS was effective for renewable or functional implants.