| 摘要 |
<p>Disclosed are Cr-free composition for treating metal surface comprising (a) a hydroxyl group-containing organic resin, (b) a phosphoric acid and (c) at least one of ions and compounds of at least one metal selected from the group consisting of Cu, Co, Fe, Mn, Sn, V, Mg, Ba, Al, Ca, Sr, Nb, Y and Zn, and optionally (d) at least one of colloids (sol) or powders of SiO2, SnO2, Cr2O3, Fe2O3, Fe3O4, MgO, ZrO2, Al2O3 and Sb2O5; as well as a metal sheet or metal article having thereon (i) a coating film of the Cr-free composition and optionally (ii) a coating film of a coating composition comprising an organic resin and if desired a colloid (sol) or a powder.</p> |
