| 摘要 |
<p>The application discloses a method of pre-treating steel articles, in particular galvanised steel articles, prior to application of one or more paint layers. A pre-treatment compound is disclosed which comprises the complex formable in solution by immersion of a metallic species in a solution of the compound R-PO(OH)2, where R includes an organic group. The metal can be in native form or as a salt. A solution of this complex can be used as a pre-treatment bath for steel items, resulting in superior adhesion of the paint layer. The application refers to the complex, a solution of the complex, the use of the complex as a coating, and to a method of coating a steel article involving the complex. The R group preferably includes at least one of an epoxy, hydroxy, unsaturated hydrocarbon, amide or carboxylic group, or a combination thereof. Suitable unsaturated hydrocarbon groups include alkenes, vinyl or acrylate groups. Other preferred forms are those in which the R group includes an aliphatic chain to which the paint layer can form an interlocking network. Such a chain is preferably at least C4 long and may be substituted. A solution of the invention preferably includes an accelerator compound, such as peroxide, which may be present in a catalytic amount.</p> |
