Abstract
ZrN-ZrO{ }_{x}N{ }_{y} and ZrO{ }_{2}-ZrO{ }_{x}N{ }_{y} coatings were deposited on 316L stainless steel substrates via the unbalanced DC magnetron sputtering technique in order to improve their corrosion resistance and evaluate their possible use as a coating biocompatible with bone cells. The composition, structure, morphology, and corrosion resistance were studied by sum means of x-ray photoelectron spectroscopy (XPS), x-Ray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The corrosion resistance was evaluated in 3.5 wt.% NaCl using potentiodynamic polarization (PL) and electrochemical impedance techniques (EIS). The ZrN-ZrO{ }_{x}N{ }_{y} and ZrO{ }_{2}-ZrO{ }_{x}N{ }_{y} coatings exhibited barrier-type protection of the substrate against corrosion. The growth of mouse osteoblast cells was evaluated in the coating that exhibited the greatest resistance to corrosion, ZrO{ }_{2}-ZrO{ }_{x}N{ }_{y}, finding that the cell viability was maintained, so this material can be considered to be a candidate for use in osteosynthesis processes.
Highlights
Metallurgy is one of the research fields that directly influence industrial development worldwide
Zirconium nitride-oxynitride coatings and zirconium oxideoxynitride coatings were deposited on AISI 316L and AISI 304 stainless steel
The results show that charge transfer resistance of the AISI 316L substrate was greatly increased from 6.79 × 104 to 7.45 × 106 Ω when the steel was coated with ZrO2-ZrOxNy, while that of ZrN is lower by two orders of magnitude, which could be related to the micropores and microcracks observed via scanning electron microscopy (SEM)
Summary
Metallurgy is one of the research fields that directly influence industrial development worldwide It underlies the chemical, automotive, oil, medical, construction, and food industries, among o thers[1,2,3]. Oxides are ceramic materials that are highly inert in acidic, alkaline, and neutral environments These protective layers generated in situ, due to the conditions of use, are fragile and deteriorate, either through mechanical stress or through corrosion, exposing the metal matrix to d egradation[3,5,14]. Oxides, or c arbides[15,17,23], so that the thin film is able to protect the substrate by isolating it from interaction with corrosive electrolytes
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