Enhancement of the corrosion resistance of 304 stainless steel by Cr-N and Cr(N,O) coatings

Mihaela Dinu, Emile S.Massima Mouele, Anca C. Parau, Alina Vladescu, Leslie F. Petrik, Mariana Braic

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Chromium nitride and oxynitride coatings were deposited as monolayers ((Cr-N), Cr(N,O)) and bilayers (Cr-N/Cr(N,O), Cr(N,O)/Cr-N) on 304 steel substrates by reactive cathodic arc method. The coatings were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), surface profilometry, and scratch tester. The anticorrosive properties of the coatings were assessed by electrochemical tests in 0.10 M NaCl + 1.96 M H 2 O 2 , carried out at 24°C. Cr 2 N, CrN, and Cr(N,O) phases were identified in the coatings by grazing incidence X-ray diffraction (GI-XRD) measurements. The measured adhesion values ranged from 19 N to 35 N, the highest value being obtained for the bilayer with Cr(N,O) on top. Electrochemical tests showed that Cr(N,O) presence in both mono- and bilayered coatings determined the lowest damage in corrosive solution, as compared to the Cr-N coatings. This improvement was ascribed to the more compact structure, lower coatings porosity, and smoother surface.

Original languageEnglish
Article number132
JournalCoatings
Volume8
Issue number4
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • Cathodic arc deposition
  • Chromium nitride
  • Chromium oxynitride
  • Coating adhesion
  • Corrosion resistance
  • Multilayer

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Surfaces and Interfaces

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