| 摘要 |
The invention relates to a process and an equipment for brightening the surfaces of hollow objects made of aluminium and/or aluminium alloy. According to the process a direct current of potential 15 to 18 V, preferably 15 V, and of heat load 1.5 to 2 A/dm<2>, preferably 2 A/dm<2> is passed through an electrolyte and the electrolyte is passed through the hollow object in turbulent flow for 15 to 20 minutes, preferably 20 minutes. A hollow body, 2, preferably a jar is dipped into the electrolyte (preferably sulphuric acid) in a vessel. An electrode 8 and a plastic tube 10 are attached to the hollow object and the said plastic tube is joined to a container 3, to which a further electrode 9 is attached. The end of the container opposite to the connection of the jar is joined to the vessel containing the electrolyte through tubing and preferably via a pump 13. <IMAGE> |
