Oxidation resistance of the coatings obtained by plasma electrolytic oxidation on aluminium alloys
2013
Kuznetsov, Yury (Orel State Agrarian University, Orel (Russian Federation). Faculty of Agricultural Machinery and Power Supply, Chair of Technology of Constructional Materials and Technical Service Organization)
Plasma electrolytic oxidation (PEO) is one of the new methods of obtaining thin layer oxide ceramic coatings on machine elements of different purpose of use; that allows considerably increase their durability. This paper outlines the results of experimental studies on corrosion resistance of oxide ceramic coatings formed by PEO on various aluminum alloys using KON-N3VO3 electrolyte. Corrosion tests of the samples were performed using the following two methods: 1. According to ASTM G44 'Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5% Sodium Chloride Solution', 2. Polarization tests. Both tests of corrosion resistance of aluminum alloys clearly demonstrate that plasma electrolytic oxidation significantly improves corrosion resistance: depending on an alloy, corrosion rates of PEO coated samples are by the factor of 2.5-80 lower as compared with non-coated samples.
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