Corrosion Stability of Oxide Coatings Formed by Plasma Electrolytic Oxidation of Aluminum: Optimization of Process Time

Electrochemical properties of oxide coatings formed by plasma electrolytic oxidation (PEO) on aluminum in sodium tungstate (Na2WO4·2H2O) with respect to process time were investigated using electrochemical impedance spectroscopy (EIS). Presence of tungsten was beneficial for the corrosion stability...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2013-07, Vol.69 (7), p.693-702
Main Authors: BAJAT, J. B, VASILIC, R, STOJADINOVIC, S, MISKOVIC-STANKOVIC, V
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Aluminum base alloys
Analytical methods
Applied sciences
Chemical reactions
Coatings
Corrosion
Corrosion environments
Corrosion prevention
Corrosion resistance
Electric fields
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Electrolytes
Exact sciences and technology
Interfaces
Metals
Metals. Metallurgy
Morphology
Optimization
Oxidation
Oxide coatings
Plasma
Porosity
Production techniques
Scanning electron microscopy
Sodium
Sodium tungstate
Spectroscopy
Spectrum analysis
Stability
Submerging
Substrates
Surface treatment
Tungsten
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Summary:Electrochemical properties of oxide coatings formed by plasma electrolytic oxidation (PEO) on aluminum in sodium tungstate (Na2WO4·2H2O) with respect to process time were investigated using electrochemical impedance spectroscopy (EIS). Presence of tungsten was beneficial for the corrosion stability of obtained oxide coatings. However, neither the amount of tungsten in the oxide coating nor the coatings thickness were identified as important factors in corrosion stability of PEO coatings, i.e., morphology and porosity solely govern the corrosion stability of PEO coatings. The evolution of EIS spectra with immersion time for coatings anodized for 5 min and 7.5 min point to more efficient corrosion protection of aluminum substrate, compared to other tested samples.
ISSN:0010-9312
1938-159X
DOI:10.5006/0859