MANUFACTURING METHODS OF PRELIMINARY LACQUERED METAL SHEET WITH Zn-Al-Mg COATING AND THE CORRESPONDING METAL SHEET Russian patent published in 2017 - IPC C23C2/06 C23C2/26 C23C22/06 C23C28/00 

FIELD: metallurgy.

SUBSTANCE: proposed versions of the metal sheet manufacturing method, comprising the following steps: providing the steel substrate (3), having two surfaces (5), each having the metal coating, obtained by immersing the substrate in the bath and cooling, and containing zinc, 0.1-20 wt % aluminium and 0.1-10 wt % magnesium; - magnesium oxide or magnesium hydroxide layers conversion, formed on the outer surfaces (15) of metal coatings (7), using the acid solution, optionally of the conversion solution with pH 1-2, and/or mechanical action; - colouring of the external surfaces (15) of metal coatings (7).

EFFECT: metal sheets manufactured using the proposed method versions have improved corrosion resistance.

23 cl, 3 dwg