Preventing crevice corrosion of titanium surfaces

Details Preventing crevice corrosion of titanium surfaces Preventing crevice corrosion of titanium surfaces

C - Chemistry, Metallurgy

09

D

117/109, 204/209

C09D 127/00 (2006.01) B05D 7/14 (2006.01) C09D 5/08 (2006.01) C09D 127/14 (2006.01) C25B 1/46 (2006.01) C25B 9/00 (2006.01) C25B 9/20 (2006.01)

Patent

CA 2016246

This discloses protection against crevice corrosion of titanium surfaces, such as cells, piping and equipment used in a chlor-alkali membrane process, by employing in the areas in which titanium is subject to crevice corrosion a coating or film cast from a "paint" dispersion containing a fluorocarbon binder material, e.g. perfluorosulfonic acid polymer, a platinum group metal oxide, e.g. ruthenium oxide, and optionally a valve metal oxide e.g. titanium oxide; and a carrier agent, e.g. ethanol and water mixture.

L'invention porte sur un système pour protéger les surfaces de titane contre la corrosion fissurante, notamment celles de cellules, de tuyaux et d'autres pièces d'équipement employés dans le procédé à membrane pour la production de chlore-alcalis; les zones où le titane est exposé à la corrosion fissurante sont recouvertes d'une couche ou d'une pellicule formée à partir d'une dispersion de « peinture » renfermant un liant à base de fluorocarbure, p. ex. un polymère d'acide perfluorosulfonique, un oxyde d'un métal du groupe du platine, p. ex. l'oxyde de ruthénium et, facultativement, un oxyde de type pour robinet, p. ex. l'oxyde de titane, enfin un véhicule, p. ex. un mélange d'éthanol et d'eau.

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