| abstract |
The invention relates to a pre-coated blank or metal sheet comprising a steel substrate for heat treatment, at least part of at least one of its main faces being covered by a pre-coating comprising at least one layer of aluminium or aluminium alloy, covered, on at least part of the pre-coating, by a polymerized layer which is between 2 and 30 micrometres thick and is composed of a polymer which contains no silicon and of which the nitrogen content is less than 1 wt.% expressed relative to the layer, the polymerized layer containing carbonated pigments in a quantity of between 3 and 30 wt.%, expressed relative to the layer. |