METHOD FOR PRODUCING A METAL SHEET HAVING ZN-AL-MG COATINGS, COMPRISING THE APPLICATION OF MECHANICAL STRESS TO THE COATINGS, AND CORRESPONDING METAL SHEET

摘要

The method comprises at least the following steps: providing a steel substrate (3) having two faces (5), depositing a coating (7) on each face (5) by quenching the substrate (3) in a hot bath; cooling the coatings (7); and, at least by applying mechanical stress to the outer surfaces (15) of the metal coatings (7), altering the magnesium hydroxide or magnesium oxide layers formed on said outer surfaces (15).