Method for coating metal surfaces with an aqueous...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/78 (2006.01) C23C 22/05 (2006.01)

Patent

CA 2425246

The invention relates to a method for coating a metal surface with an aqueous composition, characterized in that the composition contains, in addition to water: a) at least one organic film former that contains at least one water- soluble or water-dispersible polymer with an acid number ranging from 5 to 200, b) at least one particulate inorganic compound with an average particle diameter measured by a scanning electron microscope in the range of from 0.005 to 0.3 µ, c) at least one slip additive and/or at least one corrosion inhibitor, d) optionally at least one organic solvent, e) optionally at least one silane and/or siloxane, f) optionally at least one cross-linking agent, and g) optionally at least one chromium (VI) compound. The clean metal surface is contacted with the aqueous composition and a particle-containing film is formed on the metal surface which is then dried. The dried and optionally also cured film has a layer thickness ranging from 0.01 to 10 µm. The invention further relates to a corresponding aqueous composition.

La présente invention concerne un procédé de revêtement d'une surface métallique avec une composition aqueuse, se caractérisant en ce que la composition, en plus d'eau, comprend: a) au moins un agent filmogène organique qui contient au moins un polymère soluble dans l'eau ou dispersable dans l'eau, avec un indice d'acidité de 5 à 200; b) au moins un composé organique sous forme particulaire avec un diamètre de particules moyen, mesuré au microscope électronique à balayage, allant de 0,005 à 0,3 µ de diamètre; c) au moins un agent lubrifiant et/ou au moins un inhibiteur de corrosion organique; d) éventuellement au moins un solvant organique; e) éventuellement au moins un silane et/ou siloxane; f) éventuellement au moins un agent de réticulation; et g) éventuellement un composé de chrome(VI). Selon l'invention, la surface métallique propre est mise en contact avec la composition aqueuse et un film comprenant des particules est formé sur la surface métallique, ledit film étant ensuite séché. Le film séché et éventuellement durci présente une épaisseur de couche comprise entre 0,01 et 10 µm. Cette invention concerne également une composition aqueuse correspondante.

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