The effect of postdeposition heat-treatment on reactively sputtered CrN[sub x] and Cr(N, O) coatings
- J. Stefan Inst., Ljubljana (Slovenia)
Chromium nitride-based coatings, 3 [mu]m thick, were deposited by reactive sputter deposition on polished AISI 304 stainless steel substrates. By varying the reactive gas content it was possible to produce coatings of various compositions, namely CrN, CrN[sub 0.55], and Cr(N, O) coatings. The corrosion resistance of these coatings was evaluated by measuring the anodic polarization curves in 0.5M H[sub 2]SO[sub 4]. Compared to the uncoated substrate a decrease in corrosion current density for approximately two orders of magnitude is obtained on coated samples. Postdeposition heat-treatment at 450 C in an oxygen flow for 24 h had a beneficial effect on the corrosion characteristics of the nitride coatings. Auger electron spectroscopy depth profiles revealed that postdeposition treatment induced the partial transformation of nitride to Cr-oxide and Cr oxynitride layers on the surface. The thickness of the Cr-oxide layer formed is dependent on the composition of the underlying nitride coating, increasing with decreasing nitrogen content.
- OSTI ID:
- 6399830
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:3; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
AUGER ELECTRON SPECTROSCOPY
AUSTENITIC STEELS
CHALCOGENIDES
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM NITRIDES
CHROMIUM OXIDES
CHROMIUM-NICKEL STEELS
COATINGS
COHERENT SCATTERING
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
DEPOSITION
DIFFRACTION
DIMENSIONS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
HIGH ALLOY STEELS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
LAYERS
MATERIALS
MICROSCOPY
NICKEL ALLOYS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPECTROSCOPY
SPUTTERING
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
SULFURIC ACID
THICKNESS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION