MANUFACTURE METHOD OF METAL SHEET WITH Zn-Al COATING AND WITH OPTIMIZED FINISHING PROCESS, CORRESPONDING METAL SHEET, PART AND MOTOR VEHICLE Russian patent published in 2017 - IPC C23C2/06 C23C2/20 C23C2/26 

FIELD: metallurgy.

SUBSTANCE: method includes metal coating 7 deposition on the substrate surface to produce the metal sheet 1, the finishing of the metal coating 7 with at least one nozzle 17, emitting the wiping gas through at least one outlet 25 to the metal coating 7. The metal sheet 1 passes in front of the nozzle and wiping gas is ejected from the nozzle 17 along the main emission direction (E), curing of the metal coating 7. After curing and before the optional operation of pinch passing provides the outer surface 21 of the metallic coating 7 getting, which has the waviness index Wa_0.8 less than or equal to 0.55 mcm. When implementing the method check the compliance with at least one of the equations: (A), (B) , where Z is the distance between the sheet metal (1) and the nozzle (17) along the main direction of emission (E), mm, d-the average height of the nozzle (17) outlet (25) along the direction (S) of the metal sheet (1) moving before the nozzle (17), mm, V is the velocity of the metal sheet (1) moving before the nozzle (17), m⋅s^-1, P - wiping gas pressure in the nozzle (17), N⋅m^-2, and fO₂ - volume fraction of oxygen in the wiping gas.

EFFECT: increase of the sheet strength, and reliability of the product.

20 cl, 4 dwg, 3 tbl, 3 ex