Formulation for the biting of polymeric materials prior to coating them

The present invention relates to a new formulation of polymer biting treatment baths prior to metallization or coating of the polymer by technologies known and described in the state of the art, which are based on the use of salts and / or complexes of the cation Cr (III). The formulation of the present invention consists of a salt and / or a Cr (III) complex in which Cr (III) is coordinated to at least one or several mono, bi, tri, tetra, penta, hexadentate or bridge that coordinate to chromium by the oxygen, sulfur or nitrogen atom or several of these atoms to ligands. Once the polymeric part has been bitten off with the biting formulation described above, the metal coating is carried out by applying chemical and electrolytic baths in the case of metallizing, or by applying paint or other organic base coating.