The influence of plasma-sprayed coatings on surface properties and corrosion resistance of 316L stainless steel for possible implant application

Abstract

Herein, we analyzed the morphology of atmospheric plasma-sprayed (APS) coating on medical 316L stainless steel and its influence on the physical and electrochemical properties of implant application. Five types of coatings were examined: hydroxyapatite (HAp), titanium (Ti), zirconium (Zr), Ti/HAp and Zr/HAp. The base properties of the coatings were analyzed via chemical and phase composition, surface topography, surface wettability and in particular the corrosion resistance in Ringer solution in immersed conditions and potentiodynamic test, and EIS analysis. APS coating of pure HAp on 316L stainless steel showed poor cohesive bonding to the substrate material, whereas the application of Ti and Zr interlayer prior to HAp deposition improved surface morphology and coating properties. The beneficial effect of Ti and Zr interlayer under HAp layer on binding was demonstrated. HAp containing coatings (HAp, Ti/HAp and Zr/HAp) show Ca/P ratio greater than 1.8, which may positively influence the differentiation of osteogenic cells and good adhesion to bones. Among the studied materials, the composite coatings with Zr or Zr/HAp showed favorable physicochemical properties and the highest corrosion resistance in Ringer solution.

Influence of Hybrid Surface Modification on Biocompatibility and Physicochemical Properties of Ti-6Al-4V ELI Titanium

“…The diameter of the semicircle increases in the order of S_PCL < S_tex/PCL < S_PCL/TiO 2 < S_tex/PCL/TiO 2 . According to the literature data [ 7 , 53 , 54 ], and our previous reports [ 6 , 55 , 56 , 57 ], the larger the radius of curvature in the Nyquist plots, the better the corrosion resistance of the sample surface. This suggests that surface modification by electrospinning provides superior corrosion resistance compared to the textured surface.…”

Bioactive surface modifications through thermally sprayed hydroxyapatite composite coatings: a review of selective reinforcements

“…PLA/HA, 188 Ti/HA, 200 Zr/HA 200 Wear-resistant In bone joint replacement, the material should resist friction and not elicit wear particles into the body Graphene/HA, 201 CNT/HA, 16 CNT/Al 2 O 3 , 202 CNT/TiO 2 , 202 ND, 203 CNT/ferrogel 204 Al 2 O 3 /HA 6Al-4V implant could not fill the bone gap even after 2 months. 230 Despite the clinical success, being brittle, synthetic HA exhibits inferior mechanical and tribological properties as compared to bone, especially showing very poor surface mechanical properties such as low fracture toughness, bending strength, bonding strength, tensile strength, and wear resistance.…”

“…Sr simultaneously decreased thermal instability and increased cytocompatibility; Zn enhanced antibacterial activity but the challenge faced was in the reinforcement percentage. Woźniak et al 200 investigated the effects of Ti, Zr, and HA in multi-layered coatings that offered corrosion resistance and enhanced adhesion strength. The addition of Ti and Zr transformed a hydrophilic surface into a hydrophobic surface.…”

Investigation of the Properties of 316L Stainless Steel after AM and Heat Treatment

“…Generally, the material exhibits improved strength, ductility, and fracture toughness compared to conventionally manufactured 316L stainless steel [25][26][27][28][29][30][31][32]. Studies have shown that the tensile strength of 316L stainless steel prepared using L-PBF can range from 750 MPa to 1000 MPa, while the elongation at break can be as high as 50% [33][34][35]. Similarly, the yield strength (YS) of 316L stainless steel prepared using EBM can range from 590 MPa to 710 MPa, while the ultimate tensile strength (UTS) can be as high as 800 MPa [36,37].…”