Influence of RF sputtering power on surface properties and biocompatibility of 316L stainless steel alloy by deposition of TiO2 thin films
Khalaf M.K., Mazhir S.N., Mahdi M.S., Taha S.K., Bououdina M.
PublisherInstitute of Physics Publishing
SourcetitleMaterials Research Express
TiO2 coatings were deposited on medical grade 316 L stainless steel samples substrates by radio frequency (RF) sputtering technique. The influence of varying RF sputtering power (50-150 W) on the corrosion rate and biocompatibility was investigated. The thickness of TiO2 coating was found to increase considerably in the range 42.6-125.4 nm while varying the power 50-150 W. The corrosion measurements showed a great improvement in corrosion characteristics for coated samples; i.e. a small corrosion rate of (9.09 �10-4) mm/y for a coated sample at sputtering power 150 W compared with (2.419 �10-2) mm/y for the uncoated sample. TiO2 coating stainless steel substrate at power 150 W was immersed in natural uniform hydroxyapatite which concentrates five times simulated body fluid (SBF �5) at various times. The optical microscope images observations revealed an increase of coating efficiency with increasing immersion time. This research demonstrates a new low-cost approach to produce high corrosion resistance biocompatible materials. � 2018 IOP Publishing Ltd.