Influence of Surface Microstructure and Chemical Composition on the Corrosion Resistance of Plain Steel Modified by Plasma-Assisted Diffusion

The influence of surface microstructure and chemical composition on the corrosion behavior of AISI 1045 (UNS G10450) plain steel modified by plasma-assisted diffusion of nitrogen and oxygen was investigated. A detailed surface characterization was performed before and after cyclic potentiodynamic po...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2014-03, Vol.70 (3), p.271-282
Main Authors: TOMIELLO, Stevan S, ECHEVERRIGARAY, Fernando G, CRESPI, Angela E, LARRUDE, Dunieskys G, MARINO, Cláudia E. B, BIRRIEL, Eliena J, AGUZZOLI, Cesar, BAUMVOL, Israel J. R, FIGUEROA, Carlos A
Format: Article
Language:English
Subjects:
Analytical methods
Applied sciences
Carbon
Chemical composition
Chemical elements
Corrosion
Corrosion environments
Corrosion potential
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Cracking (corrosion)
Defects
Diffusion
Electrodes
Electron microscopy
Emission spectroscopy
Exact sciences and technology
Gases
Glow discharges
Inclusions
Manganese
Metals. Metallurgy
Microstructure
Morphology
Nitrogen
Optical emission spectroscopy
Oxidation
Oxynitrides
Plasma
Polarization
Radio frequency
Salt spray tests
Scanning electron microscopy
Spectrum analysis
Steel
Sulfide
Sulphides
Surface properties
Thickness
X rays
X-ray diffraction
X-ray spectroscopy
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Summary:The influence of surface microstructure and chemical composition on the corrosion behavior of AISI 1045 (UNS G10450) plain steel modified by plasma-assisted diffusion of nitrogen and oxygen was investigated. A detailed surface characterization was performed before and after cyclic potentiodynamic polarization and salt spray tests, using scanning electron microscopy at low and high resolutions, energy-dispersive x-ray spectroscopy, x-ray diffraction, and glow discharge optical emission spectroscopy. The corrosion resistance as determined by cyclic potentiodynamic polarization was found to depend more strongly on the morphology and composition of the outermost oxynitride layer than on its thickness. For post-oxidation times below and above 90 min, the oxynitride layer presented defects that can act as pathways for corrosive species. The degradation of the corrosion resistance for longer processing times is through cracking of granules, which were previously formed at shorter times owing to the hydrogen accumulation at the oxide-nitride interface. The salt spray tests revealed a main dependence on the manganese sulfide (MnS) inclusions content in the base material.
ISSN:0010-9312
1938-159X
DOI:10.5006/1055