<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.mchakato wa kuunda filamu ya oksidi juu ya uso chini ya hatua ya sasa ya nje inaitwa anodization, kama vile utaftaji wa aloi ya aluminium.  <response>: under the effect of external current, the process of forming an oxidation film on the surface of the workpiece is called anodizing, such as anodizing of aluminum alloy. 