Process for coating metal sheets, in particular sheets of zinc

Process for coating selected from aluminum and its alloys, zinc and susaleaciones and galvanized steel or galvanized zinc alloy metal, wherein the metal ayes necessary cleaned, a) they are subjected to a conversion treatment and known per se in the state of the art, by contacting them with a solution containing conversion at least one simple salt ocompleja of at least one metal M, to obtain a conversion layer containing 0.01 to 0,7mmoles / m2 of metal M, b) if desired, rinsed with water and / or dried, c) are contacted with the coating medium, which contains: c1) a total of 5 to 30% by weight of one or more resins termoendurocibles crosslinking abase urethane, carrying blocked isocyanate groups, wherein no more than 5% of losatomos containing carbon are present in the aromatic groups and / or unsaturated; c2) a total of 10 to 30% and n weight of one or more crosslinking agents for componentec1; c3) from 4 to 30% by weight of one or more pigments corrosion protection and, as the remainder, one or more organic solvents and / or , water and also, if desired, other auxiliaries or substanciasactivas as continuaciond) the coating obtained in substep c) is cured by heating at a temperature of at least 100 substratode.