Compagnie Francaise De Produits Industriels

Cfpi Industries

Daniel Bernard

Joseph Schapira

Patrick Droniou

Patrice Pelletier

Michel Sudour

Michele Guimon

The invention relates to a process for the phosphatization of metallic substrates comprising the use of a phosphatization bath having a pH from 1 to 5.5 and which comprises from about 0.3 to about 25 g/l of zinc ion, preferably from 0.5 to 10 g/l, from 5 to about 50 g/l of phosphate ion, preferably from 8 to 30 g/l, and from about 0.01 to about 10 g/l, preferably from 0.03 to 3 g/l of a trivalent cobalt complex.

Bath and process for the phosphatization of metallic substrates,

Process adapted to provide on a metallic substrate a protective coating

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Epinay sur Seine, France

Daniel Bernard