Non-aqueous degreasing and chromating solution for metal treatment
AssigneeNippon Dacro Shamrock Co., Ltd.
InventorsNobuhiro Ayukawa, Yasuhiko Konishi
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Abstract
A non-aqueous chromating treatment solution comprising a chlorofluorocarbon solvent, chromic acid anhydride, an alcohol solubilizer, and an organic carboxylic acid reaction promotor gives a higher coating amount of chromate film and better corrosion resistance effect.
Claims2
A non-aqueous degreasing and chromating solution for metal treatment essentially consisting of 100 parts by weight of a chlorofluorocarbon solvent, containing not more than 2 carbon atoms, fluorine atoms and chlorine atoms and no hydrogen atom, 0.5-5 parts by weight of chromic acid anhydride, 0.001-0.1 part by weight of an organic carboxylic acid containing 1-20 carbon atoms represented by the general formula R(COOH).sub.n wherein R is a straight-chained, branched or cyclic hydrocarbyl group, which may be substituted and n is an integer 1-3, and 1-20 parts by weight of an alcohol solubilizer containing 3-20 carbon atoms.
Dependencies are inferred from the claim text.