Electrodeposition of hydroxyapatite (HAp) coatings on etched titanium mesh substrate

Abstract

This study was carried out in order to investigate the formation of hydroxyapatite (HAp) coatings on etched Ti mesh substrate using electrodeposition technique. The coatings were deposited from solution containing CaCl 2 and NH 4 H 2 PO 4 (with Ca/P ratio being 1.67) by maintaining cathodic potentials for -0.8 V and -1.5 V vs Ag/AgCl for 30 min at 80 o C. On the other hand, chitosan solution was also added into bath solution to study its effect on coatings morphology. The surface morphology and the elemental compositions of the Ti surface before and after deposition were observed by FESEM and EDAX, respectively. Etching process has changed the morphology of the Ti surface from smooth to rough surface. HAp coatings deposited at -0.8 V and -1.5 V have similar morphology with flower-like structure. However, the coatings are more dense and compact when deposited at higher potential (i.e.: -1.5 V). When chitosan was added into bath solution, the morphological structure of the coating was significantly changed from flower-like structure to flake-like structure interconnected with net-like structure of chitosan.

Simultaneous Precipitation and Electrodeposition of Hydroxyapatite Coatings at Different Temperatures on Various Metal Substrates

“…Another drawback consists in their poor bioactivity, and in this case, Ti implants can serve as an example. The protective titanium oxide that forms on their surface makes them biologically inert, while their high stiffness can make them fail to bond to the bone tissue [20][21][22].…”

“…As for stainless steel (316L), even though it is highly resistant to corrosion and has good biocompatibility, it is difficult for the bone tissue to develop on its surface [22,23].…”