METHOD FOR LASER MARKING OF PRODUCT SURFACE OF ALUMINIUM OR ITS ALLOY WITH OXIDE OUTER LAYER Russian patent published in 2017 - IPC B23K26/18 B41M5/26 B44B7/00 B44C1/00 B44C1/22 C23C26/02 H01S3/10 

FIELD: physics.

SUBSTANCE: formation of the marking visually observed by the human vision is carried out, different from the product surface areas adjacent to the marking, due to changes in the structure compared with the material in the areas adjacent to the marking by the action of laser radiation and subsequent cooling. It is effected by the laser radiation having a wavelength selected from the condition of the radiation absorption by the aluminium oxide without damaging the surface of aluminium or its alloy. Hardening the oxide outer layer is performed by providing the pore closure in the modified and unmodified areas of the oxide outer layer. The oxide layer structure is formed, different from the material in the areas adjacent to the marking in the process of cooling the melt and condensing the evaporated material of the oxide outer layer.

EFFECT: hardening the oxide coating of products of aluminium or its alloy, while maintaining the initial surface shape of aluminium or its alloy.

11 cl, 2 dwg, 2 ex, 1 tbl