Method for producing a metal sheet having oiled Zn—Al—Mg coatings, and corresponding metal sheet
AssigneeArcelormittal Investigacion Y Desarrollo, S.L.
InventorsTiago Machado Amorim, Joëlle Richard, Eric Jacqueson, Audrey Lhermeroult, Pascale Feltin, Jean-Michel Lemaire, Luc Diez, Jean-Michel Mataigne
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Abstract
A method for producing a metal sheet is provided. The method includes providing a steel substrate having two faces, depositing a metal coating on each face by dipping the substrate in a bath, cooling the metal coatings, altering layers of magnesium oxide or magnesium hydroxide formed on the outer surfaces of the metal coatings, and depositing a layer of oil on the outer surfaces of the metal coatings.
Claims22
A method for producing a metal sheet having two faces each coated with a metal coating comprising zinc, between 0.1 and 20 wt % of aluminum, and between 0.1 and 10 wt % of magnesium, the method comprising the steps of:
- providing a steel substrate having two faces;
- depositing a metal coating on each face by hot dipping the steel substrate in a bath;
- cooling the metal coatings;
- altering layers of magnesium oxide or magnesium hydroxide formed on outer surfaces of the metal coatings by applying an acid solution on the outer surfaces of the metal coatings or by applying mechanical forces using a roller leveler, a brushing device, or a shot-blasting device on the outer surfaces of the metal coatings;
- and then depositing a layer of oil directly on the outer surfaces of the metal coatings.
Dependencies are inferred from the claim text.