Non-aqueous composition for chemical treatment of a metallic substrate
AssigneeNippon Paint Co., Ltd.
InventorsHideo Wada, Akiro Ushio, Masaharu Koganei
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Abstract
A non-aqueous composition for chemical treatment of the surface of a metallic substrate which comprises a chlorinated hydrocarbon solvent, chromic anhydride, phosphoric acid, a solubilizer and a stabilizer. By the use of such non-aqueous composition, chemical treatment can be achieved quickly with remarkable saving of operation steps. The coating resulting from such chemical treatment has a high corrosion resistance and an excellent adhesion with a paint coating film formed thereon.
Claims9
A substantially non-aqueous composition for chemical treatment of the surface of a metallic substrate, which comprises a chlorinated hydrocarbon solvent, chromic anhydride, phosphoric acid, a solubilizer which is per se soluble in the chlorinated hydrocarbon solvent, can solubilize the chromic anhydride and the phosphoric acid therein and a stabilizer which can prevent the decomposition of the chlorinated hydrocarbon solvent, inhibition of the reduction of the chromic anhydride or stabilization of the non-aqueous composition, and wherein the weight proportion of the chlorinated hydrocarbon solvent, chromic anhydride, phosphoric acid, the solubilizer and the stabilizer is 100:0.003-0.03:0.003-0.12:0.1-2:0.001-5.
Dependencies are inferred from the claim text.