BLACK ANTICORROSIVE COVERING ON A ZINC ALLOY AND PROCEDURE OF PREPARATION OF THE SAME.

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Procedure for the deposit of an anticorrosive black covering on a zinc alloy, that consists of dealing with the alloy zinc in one first stage of procedure by an acid aqueous solution of Cr3+, free of Cr6+, containing a training agent of complexes or several training agents of complexes, and treating the pasivada zinc alloy in this way secondly about the procedure by means of a watery suspension that an organic polymer, an anticorrosive metallic oxide, selected contains between the titanium dioxide, silicon dioxide, zirconium dioxide and/or rare earth oxides such as cerium oxide, or La2O3 or Y2O3 or Pr6O11 and preferably a black pigment depositing this way a second layer of a thickness of 0, 5 to 5 µm and, preferably, of 0, 5 to 2, 5 µm.