| abstract |
A highly corrosion-resistant, paint-adherent, and lubricating polymer-containing coating on a metal surface can be formed by contact with an aqueous solution (pH = 2.0 to 6.5) that contains an acidic compound and polymer with formula (I) in which the X bonded to the phenyl ring in formula (I) represents a hydrogen atom, a hydroxyl group, a C1 to C5 alkyl group, a C1 to C5 hydroxyalkyl group, a C6 to C12 aryl group, a benzil group, a benzal group, an unsaturated hydrocarbon moiety condensed to the phenyl ring so as to form a naphthalene ring, or a group corresponding to formula (II) in which R?1 and R2¿ in formula (II) each independently represents a hydrogen atom, a hydroxyl group, a C¿1? to C10 alkyl group, or a C1 to C10 hydroxyalkyl group; the Y?1 and Y2¿ bonded to the phenyl ring in formulas (I) and (II) each independently represents a hydrogen atom or a group Z according to one of formulas (III) and (IV) in which each of R?3, R4, R5, R6, and R7¿ in formulas (III) and (IV) independently represents a C¿1? to C10 alkyl group or a C1 to C10 hydroxyalkyl group; the X's bonded to the phenyl rings in the polymer molecule may all be identical or may differ from one another; each of the Y?1¿'s and Y2's bonded to the phenyl rings in the polymer molecule may all be identical or may differ from one another; the average value for the number of Z groups substituted on each phenyl ring in said polymer molecule is 0.2 to 1.0; and n has a value of 2 to 50. |