Effect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation

Title
Effect of Na2WO4 in electrolyte on mechanical properties of oxide layer on Al alloy via plasma electrolytic oxidation
Author(s)
고영건양해웅김연성[김연성]박주현김계원[김계원]신동혁[신동혁]
Keywords
MICRO-ARC OXIDATION; CERAMIC COATINGS; ALUMINUM-ALLOY; CORROSION-RESISTANCE; GROWTH-MECHANISM; BEHAVIOR; FILMS
Issue Date
201508
Publisher
KOREAN INST METALS MATERIALS
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, v.53, no.8, pp.535 - 540
Abstract
This paper investigates with the mechanical properties of Al alloy samples coated by plasma electrolytic oxidation (PEO) using a phosphate electrolyte with a Na2WO4 solution. Under an A Ccondition of 60Hz, PEO coatings were applied for 300 seconds at a current density of 100mA/cm(2). Microstructural observations of the PEO-coated samples revealed that the size and fraction of the micro-pores remained nearly constant while WO3 and W were additionally in corporated in the oxide layer using the Na2WO4 solution. During PEO coating, the Na2WO4 solution dissociated into Na+ and WO42- and the high dielectric voltage exceeding the ignition voltage activated the electrochemical reactions of WO42- in the anode, leading to the formation of WO3 and W. The incorporation of WO3 and W is expected to lead to enhancement of the hardness and wear resistance of the PEO-coated Al sample.
URI
http://hdl.handle.net/YU.REPOSITORY/31406http://dx.doi.org/10.3365/KJMM.2015.53.8.535
ISSN
1738-8228
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공과대학 > 신소재공학부 > Articles
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