Process adapted to provide on a metallic substrate a...

Details Process adapted to provide on a metallic substrate a... Process adapted to provide on a metallic substrate a...

B - Operations, Transporting

05

D

148/20, 117/230,

B05D 7/14 (2006.01) B05D 3/10 (2006.01) C23C 22/74 (2006.01)

Patent

CA 2029381

PROCESS ADAPTED TO PROVIDE ON A METALLIC SUBSTRATE A PROTECTIVE COATING BASED ON HEXAVALENT CHROMIUM, BATH USED IN THE SAID PROCESS AND COMMERCIAL FORM OF THE COMPONENTS OF THE BATH A B S T R A C T Process adapted to provide on a metallic substrate, a protective coating against corrosion based on hexavalent chromium, without any necessity of a supplementary protec- tion, the said process which comprises: - a step for the preparation of the metallic substrate by degreasing, possibly followed by mechanical or chemical pickling, - a step comprising the use by immersion or spraying of a bath adapted to provide on the metallic substrate the contemplated protective coating and - a curing step at high temperature, is characterized by the fact that the above-mentioned bath comprises at least: - a metal in the form of particles, - chromic acid and/or one of its derivatives as oxydizing agent, - at least one hydrosoluble solvent having a high boiling point and selected from those of the aprotic polar type and of the cetonic type, - water. No figure.

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