Fabrication of Hardystonite Nano-bioceramic Coating on 306L Stainless Steel Substrate Using Electrophoretic Method and Evaluation of Its Corrosion Resistance to Improve Medical Performanc

Metals and alloys are widely used in dentistry, medicine and restoration of defected bone as arti?cial implants or restorative materials. Bone implants are mainlymadeofmetalstobeabletowithstandmechanicalstressesduringoperation. Stainless steel 306L is the most common alloy used in the manufacture of bone implants.Themaincharacteristicofthisalloyistohavegoodmechanicalproperties, but there is always concern about the corrosion resistance of them in physiological andbioactivesolutions.Inthisstudy,Hardystonitenano-bioceramicwaspreparedby sol-gelmethodandaftersurfacepreparationwasappliedon316Lsteelat3and5min timedurationsand30and50Vvoltagesusingelectrophoreticmethod.Thecorrosion resistanceof316Lstainlesssteelinringersolutionwasmeasuredbypotentiodynamic polarization test at constant temperature of 37 °C before and after coating process which due to very good bioactivity of Hardystonite ceramic the corrosion resistance of316Lsteelhasalsoincreased.Thesurfacemicrostructureofthecoatedspecimens was investigated using a scanning electron microscope (SEM). The composition of phases and elemental characterization of the coatings was determined by X-ray diffraction method. Results show that the obtained coating on 316L steel is nearly uniformandhasnoapparentdefectat50Vand5min.TheHardystonitecoatinghas improvedthecorrosionresistanceofthesubstratesothatthecorrosioncurrentdensity in the coated samples is less than the uncoated ones and the corrosion resistance of 316L steel has increased 9 times. The results showed that Hardystonite bioceramic coating applied by electrophoretic method can improve the corrosion behavior and consequently the biocompatibility of metallic implant in medicine applications

Hardystonite·316L steel·Electrophoretic·Sol-gel·Ringer solution