| 摘要 |
<p>A surface of aluminiferous metal is brought into contact at 25 to 65 C° for 2 to 100 seconds with a surface treatment bath with a pH of 1.0 to 6.0 that contains phosphate ions, dissolved titanium and/or zirconium compounds, dissolved fluorine-containing anions, and a water soluble polymer in the following weight proportions: 1 - 100:1 - 50:1 - 200:1 - 200. This is followed by a water rinse and drying. The water soluble polymer has a chemical structure conforming to formula (I), in which each of X?1 and X2¿ represents a hydrogen atom, a C¿1? to C5 alkyl group, or a C1 to C5 hydroxyalkyl group; each of Y?1 and Y2¿ represents a hydrogen atom or a moiety 'Z' that conforms to formula (II) or (III), wherein each of R?1, R2, R3, R4, and R5¿ represents a C¿1? to C10 alkyl group or a C1 to C10 hydroxyalkyl group; the average value for the number of Z moieties substituted on each aromatic ring in the polymer molecules is from 0.2 to 1.0; n is an integer; and the average value of n for the total polymer is from 2 to 50.</p> |
