Hydroxypatite Coating On Stainless Steel Aisi 316l For Biocompatiblity Application

Abstract

This paper presents the synthesis of hydroxyapatite (HAp) using eggshell biowaste and electrophoretic deposition of the material on AISI 316L stainless steel to make it more biocompatible in implantation. HAp powder was synthesized through a hydrothermal reaction and was characterized using X-ray diffraction, which proved that it was pure in terms of phase. The uniform coatings were deposited at 72 V 30-45 min after which they were sintered in an argon atmosphere. The coating was very adhesive and the critical load of the scratch test was 125 N. Simulated body fluid in vitro testing revealed that there was a slight change in pH (7.4 to 7.5) over 10 days, which implies the chemical stability of the material and proper corrosion protection. These findings show that HAp-coated 316L stainless steel is a promising and cost-effective biomaterial to use as orthopedic and dental implants because it integrates the bioactivity of hydroxyapatite and the mechanical strength of the metal.