Cleaning aluminium workpieces

摘要

PCT No. PCT/GB95/02956 Sec. 371 Date Oct. 16, 1997 Sec. 102(e) Date Oct. 16, 1997 PCT Filed Dec. 18, 1995 PCT Pub. No. WO96/19596 PCT Pub. Date Jun. 27, 1996A method of cleaning an Al workpiece comprises a.c. anodising the workpiece in an acidic electrolyte capable of dissolving aluminium oxide and maintained at a temperature of at least 70 DEG C. under conditions such that the surface of the workpiece is cleaned with any oxide film thereon being non-porous and no more than about 20 nm thick.