METHOD OF ANTICORROSIVE PROCESSING OF ALUMINIUM SURFACE OR ALUMINIUM ALLOYS Russian patent published in 2017 - IPC C25D11/18 C23C4/12 C23C4/18 C23C26/00 

FIELD: chemistry.

SUBSTANCE: surface of the product is subjected to a pulsed energy effect by the radiation of a pulsed ytterbium fiber ytterbium laser with a wavelength of 1.065 mcm at a specific radiation power 4,539⋅10¹⁰…8,536⋅10¹⁰ W/cm², the pulse repetition rate 20…40 kHz and the scanning speed of the surface by laser radiation 250…700 mm/s.

EFFECT: obtaining on the surface of a product made of aluminium or an aluminium alloy of a dense impermeable passive film of aluminium oxide, effectively protecting the metal from corrosion.

3 cl, 3 dwg, 1 tbl, 11 ex