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Title:
METHOD OF FORMING A PROTECTIVE OXIDE CERAMIC COATING
Document Type and Number:
WIPO Patent Application WO/2019/143270
Kind Code:
A3
Abstract:
The invention relates to the field of electroplating. A method of plasma electrolytic oxidation (PEO) includes submerging an article as an electrode, together with a counter electrode, in a bath filled with an aqueous alkaline electrolyte, and supplying bipolar rectangular voltage pulses to the electrodes using a pulsed power supply. The ratio of the duration of an anodic pulse to dead time is selected in a range of 1:5 - 1:6, the duration of an anodic pulse is 3-30 µs, and the total duration of a period is 30-300 µs. PEO is carried out at the following amplitude values: 600-1200 V for the anodic voltage pulses, and 150-400 V for the cathodic voltage pulses. The invention provides for the production of fully melted, homogeneous oxide ceramic coatings having a high microhardness, a high elastic coefficient, high adhesive and cohesive strength, and a high density.

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Inventors:
KOKAREV VLADIMIR NIKANDROVICH (RU)
SHATROV ALEKSANDR SERGEEVICH (RU)
MALIKOV NIKOLAI ANDREEVICH (RU)
Application Number:
PCT/RU2019/000089
Publication Date:
September 12, 2019
Filing Date:
February 13, 2019
Export Citation:
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Assignee:
KOKAREV VLADIMIR NIKANDROVICH (RU)
International Classes:
C25D11/00; C25D11/02
Domestic Patent References:
WO2008120046A12008-10-09
Foreign References:
RU2466218C12012-11-10
RU2112086C11998-05-27
KR20160024616A2016-03-07
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