Model Concepts on the Mechanism of Microarc Oxidation of Metal Materials and the Control over This P |
18.09.2008 г. |
Model Concepts on the Mechanism of Microarc Oxidation of Metal Materials and the Control over This Process A. G. Rakoch, V. V. Khokhlov, V. A. Bautin, N. A. Lebedeva, Yu. V. Magurova, and I. V. Bardin Moscow State Institute of Steel and Alloys (Technological University), Leninskii pr. 4, Moscow, 119991 Russia e-mail:
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Received July 16, 2005 Abstract — Based on a critical analysis of literature data, new model concepts on the mechanism of microarc oxidation (MAO) are developed. The correctness of these model concepts is confirmed by experimental results on the average growth rate of oxide-ceramic coatings for different duration of the MAO process on 31, 21, and 5 alloys, the morphology of the surface structure of coatings of different thickness, the comparative electrical strength of dielectric coatings, which is assessed during self-quenching of the MAO process and in air. Equivalent electric circuits developed describe this process and are experimentally shown to be the “tool” which allows controlling MAO of aluminum and magnesium alloys.
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