Journal
COATINGS
Volume 11, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/coatings11101257
Keywords
ZrSiN; ZrSi(N, O)& nbsp;; monolayer and double-layer & nbsp;; reactive cathodic arc evaporation & nbsp;; corrosion evaluation & nbsp;; acidic environment
Categories
Funding
- Romanian National Authority for Scientific Research and Innovation CCCDI-UEFISCDI
- PNCDI III [91/2019]
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Zr-based nitrides and oxynitrides were deposited using reactive cathodic arc evaporation on 304L stainless steel substrates in monolayer and double-layer structures. The SS/ZrSiN/ZrSi(N,O) coating exhibited the best corrosion performance in an acidic environment, attributed to the high content of Si and O in the composition, forming a stable passive layer that acted as a barrier to electrolyte ingress.
Zr-based nitrides and oxynitrides were deposited by reactive cathodic arc evaporation in monolayer and double-layer structures with the aim of increasing the corrosion protection of 304L stainless steel (SS) in a biomedical aggressive environment. All coatings had a total thickness of 1.2 mu m. Compared to the bare substrate, the surface roughness of the coated samples was higher, the presence of microdroplets being revealed by scanning electron micrography (SEM). The X-ray diffraction investigation of the ZrN phases revealed that the peaks shifted towards lower Bragg angles and the lattice constants increased as a result of Si and O-2 inclusion in ZrN lattice, and of the ion bombardment characteristic of the cathodic arc method, augmented by the applied bias substrate. SS/ZrSiN/ZrSi(N,O) showed the best corrosion performance in an acidic environment (0.9% NaCl and 6% H2O2; pH = 4), which was ascribed to the blocking effect of the interfaces, which acted as a corrosion barrier for the electrolyte ingress. Moreover, the aforementioned bilayer had the highest amount of Si and O in the composition of the top layer, forming a stable passive layer with beneficial effects on corrosion protection.
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