| 摘要 |
<p>Disclosed is a process of prepaint surface conversion on galvanised steel coils, as an alternative to the conventional alkaline passivation (or oxidation) treatment, characterised by a conversion treatment in an aqueous solution free from heavy metal, particular free from cobalt and nickel-free, and containing ferric ions, trivalent chromium ions, zirconium salts, a complexing agent and a base.</p> |
