Part 2. Influence of the Current Waveform on the Growth
Kinetics
of Microarc Coatings on the Surface of Light Construction
Alloys in Alkali (pH
12.5) Electrolytes
A. G. Rakoch*, I. V. Bardin**, V. L. Kovalev***, T. G. Avanesyan****, and A. G. Seferyan*****
National University of Science and Technology “MISiS”, Leninskii pr. 4, Moscow, 119049 Russia
*e-mail: rakoch@mail.ru
**e-mail: bardin_ilya@list.ru
***e-mail: emamfitor@gmail.com
****e-mail: tachat_a@hotmail.com
*****e-mail: sef-on@mail.ru
Abstract—Based on the experimental data, the mechanism of the influence of the cathodic component of the
ac current on the growth kinetics and the limiting thickness of the microarc coatings formed on the surface of
aluminum and magnesium alloys is suggested. It is shown that, during microarc oxidation (MAO), the cathode
component of the ac current either increases (in the case of the Al alloy) or decreases (in the case of the Mg
alloy) the number of effective microcharge discharges due to an increase in the electrolyte pH in the through
pores of the coating and the elevation of the temperature of the MAO process.
Keywords: microarc oxidation, current waveform, thickness and growth rate of coatings, cathode component of
the ac current, microarc coatings
DOI: 10.3103/S1067821213040147
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