Effect of Nano-crystalline Ceramic Coats Produced by Plasma Electrolytic Oxidation on Corrosion Behavior of AA5083 Aluminum Alloy

Journal Article · Mon Oct 04 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3504277· OSTI ID:21454838

Thayananth, T; Muthupandi, V ^[1]; Rao, S R. Koteswara ^[2]

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1. Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli-620015 (India)
2. Principal, Tagore Engineering College, Chennai-600048 (India)

High specific strength offered by aluminum and magnesium alloys makes them desirable in modern transportation industries. Often the restrictions imposed on the usage of these alloys are due to their poor tribological and corrosion properties. However, their corrosion properties can be further enhanced by synthesizing ceramic coating on the substrate through Plasma Electrolytic Oxidation (PEO) process. In this study, nano-crystalline alumina coatings were formed on the surface of AA5083 aluminum alloy test coupons using PEO process in aqueous alkali-silicate electrolyte with and without addition of sodium aluminate. X-ray diffraction (XRD) studies showed that the crystallite size varied between 38 and 46 nm and {alpha}- and {gamma}- alumina were the dominant phases present in the coatings. Corrosion studies by potentiodynamic polarization tests in 3.5% NaCl revealed that the electrolyte composition has an influence on the corrosion resistance of nano-crystalline oxide layer formed.

• OSTI ID: 21454838
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1276; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ALKALI METAL COMPOUNDS
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COATINGS
COHERENT SCATTERING
CORROSION
CORROSION PROTECTION
CORROSION RESISTANCE
DIFFRACTION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
LAYERS
MAGNESIUM ALLOYS
METALS
NANOSTRUCTURES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
SCATTERING
SODIUM CHLORIDES
SODIUM COMPOUNDS
SUBSTRATES
SURFACES
X-RAY DIFFRACTION