| 摘要 |
A surface of a light-metal alloy is anodically polarized in a cleaning process. The surface is cleaned with a solution containing phosphoric acid, alcohol, and optionally fluoride. Additionally, the surface is passivated in an oxidizing process using, for example, fluoride ions or an aqueous oxidizing agent. Preferably, the light-metal alloy has a relatively high Al or Mg content. This method is suitable for preparing the surface for a subsequent coating operation.
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