METHOD FOR FORMING HEAT TRANSFER SURFACE WITH A COMBINED POROUS COATING AND HEAT TRANSFER SURFACE OBTAINED IN THIS WAY Russian patent published in 2023 - IPC C25D11/00 C25D11/04 C25D11/06 F28F13/18 

FIELD: heat transfer surface.

SUBSTANCE: invention is related to formation of a heat transfer surface on aluminium or an aluminium alloy in form of a ceramic capillary-porous coating. The method is characterized by the fact that the surface of aluminium or aluminium alloy is placed in a galvanic bath with an aqueous multicomponent silicate-alkaline electrolyte, an alternating voltage is applied in a pulsed anode-cathode mode and a direct current is passed to form a ceramic capillary-porous coating on the surface with a thickness of 1 to 100 microns with micro- and nano-relief open porosity of 10-50% of the coating volume, with a distance between pores from 10 nm to 40 microns and a diameter of 1-50 microns, while the electrolyte temperature is maintained at the corresponding boiling temperature with sub-heating by 5-30°C, and the current density is maintained in the range from 1 A/dm² to 50 A/dm².

EFFECT: formed heat transfer surface, compared to a smooth surface, ensures intensification of heat transfer in film, transition and nucleate boiling modes from 2 to 5 times.

5 cl, 2 dwg, 1 tbl, 1 ex