| abstract |
Here are provided a composition for hydrophilic treatment of aluminum or aluminum alloy which can form film having persistent corrosion resistance and hydrophilicity and not generating odor, and a method for hydrophilic treatment.Namely, provided by the invention are a composition for hydrophilic treatment of aluminum or an aluminum alloy which comprises(P1) a water-soluble polymer having as a constitution unit monomer(s) (I) represented by the formula wherein, R1 represents a hydrogen atom or a methyl group, and R2 and R3 are the same or different, and each represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a benzyl group or a hydroxyalkyl group having 2 or 3 carbon atoms, and obtained by homopolymerization or copolymerization of the monomer(s) (I),(A) a water-soluble trivalent chromium compound,(B) a water-soluble zirconium compound or titanium compound, and, if necessary, further water, and wherein the mutual rate of P1, A and B is such that, based on 100 weight parts of the solid matter of P1, A is 0.01 to 70 weight parts and B is 0.001 to 70 weight parts, and a method for hydrophilic treatment using it. |