SELECTIVE COATING OBTAINING METHOD Russian patent published in 2009 - IPC F24J2/48 

FIELD: heating systems.

SUBSTANCE: selective coating obtaining method involves oxidation of aluminium and its alloys in acid solution, electrolytic filling of oxide pores with high-dispersion nickel. Additional filling of pores is performed with high-dispersion argentum, and for oxidation and electrolytic filling of pores there used is alternating asymmetrical current in which average cathode current is higher than anode one and their ratio is 2.5:1 and 5:1 accordingly at voltage of 8-15 V, oxidation electrolyte includes Mn, Al, Ni metal salts at the following component ratio, (g/l): sulphuric acid 180.0-200.0; glycerine 1.0-3.0; citric acid 2.0-5.0; aluminium sulphate 25.0-35.0; nickel sulphate 25.0-35.0; potassium hypermanganate 2.0-3.0.

EFFECT: simplifying selective coating obtaining procedure.

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