Multiwalled Carbon Nanotubes Reinforced Hydroxyapatite‐Chitosan Composite Coating on Ti Metal: Corrosion and Mechanical Properties
Multiwalled carbon nanotubes (MWCNT) reinforced Hydroxyapatite‐chitosan composite coating is developed on Titanium metal by single step Electrophoretic deposition (EPD). By suitably controlling EPD process parameters,
it has been possible to co‐deposit MWCNT and hydroxyapatite (HAp) electrophoretically and chitosan electrochemically on Ti metal from acetic acid/water/ethanol mixed solvent containing dissolved chitosan. At optimized process parameters, the
coating contains uniform incorporation of MWCNT in porous HAp‐chitosan matrix, having composition of 10–12 wt% chitosan, 10–15 wt% MWCNT, rest HAp, as determined by thermogravimetric
analysis. Raman spectra of composite coating reveal almost unaffected characteristics of carbon nanotubes. Adhesion strength and microhardness of composite HAp‐chitosan‐MWCNT coating increases compared with HAp coating.
Composite coating is found to be highly corrosion resistance with corrosion current at 9 nA/cm2. The apatite growth after immersion in simulated body fluid for 10 days shows that the composite HAp‐chitosan‐MWCNT coating
is bioactive in nature.