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Corrosion and Multi-Scale Mechanical Behaviour of Plasma Electrolytic Oxidation (PEO) and Hard Anodized (HA) Coatings on AA 2219 Aluminum Alloy

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Abstract:

The electrochemical corrosion and mechanical properties of ceramic coatings fabricated by plasma electrolytic coating (PEO) and hard anodizing (HA) methods comparatively examined for AA2219. Potentiodynamic polarization results revealed that the corrosion resistance of both coatings are comparable to each other. However, the indentation and scratch testing indicated that the hardness and modulus of the PEO coating was significantly higher when compared to HA coating. The critical load (Lc2) causing adhesive failure of the PEO coating was much high (19N) when compared to HA coating (10N) showing better adhesive strength of the PEO coating.Key words: Plasma electrolytic oxidation (PEO), potentiodynamic polarization, nanoindentation, hard anodizing

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Periodical:

Materials Science Forum (Volumes 830-831)

Pages:

627-630

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.830-831.627

Citation:

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Online since:

September 2015

Authors:

A. Venugopal*, J. Srinath, P. Ramesh Narayanan, S.C. Sharma, Koshy M. George

Keywords:

Hard Anodizing, Nanoindentation, Plasma Electrolytic Oxidation (PEO), Potentiodynamic Polarization

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