FIELD: electroplating.
SUBSTANCE: invention relates to the field of electroplating and can be used in various sectors of the national economy: for finishing appliances, manufacturing panels, radiators, solar panels, in the production of decorative ornaments, and the construction industry. The method includes immersing the product in a bath with an aqueous electrolyte solution and microarc oxidation (MAO) in a pulsed anode-cathode mode, while setting and regulating: anode voltage in the range from 250 to 600 V with a pulse duration of 50 to 1000 μs and a frequency of 30 up to 1000 Hz, cathode voltage in the range from 0 to 100 V with pulse duration from 50 to 1000 µs and frequency from 30 to 1000 Hz and pause time between anode and cathode pulses from 0 to 10 ms, while the fraction of anode pulses varies from 100 up to 10% relative to cathodic pulses, and the proportion of cathodic pulses varies from 0 to 90% relative to anodic pulses, and MAO is carried out in an electrolyte at the following ratio of components, g/l: disodium phosphate 20-50, sodium tetraborate 25-60, boric acid 15- 50, sodium fluoride 1-8, potassium hexacyanoferrate (III) 3-10. A ceramic protective and decorative coating of camouflage color of various shades, including green, is formed on a product, at least one surface of which is completely or partially made of valve metal or its alloy, containing an oxide of the said metal, consisting of at least two layers of total thickness from 10 to 70 microns, while the upper layer with a thickness of 5 to 65 microns additionally contains iron 0.2-45.0 wt.%.
EFFECT: formation of a protective coating of camouflage uniform coloring of various shades in the process of one technological operation of MAO, increasing the physicochemical characteristics of the resulting coating.
8 cl, 2 dwg, 10 ex
