Copper Descaling

The surface oxide films that form on Copper
alloys can prove to be quite tenacious.
Often these films need to be removed
before some fabrication processes can be
performed.
Very fine abrasive belts or discs can be
used to remove oxides and discolouration
adjacent to welds.
Pickling might be necessary by using a hot
5-10% sulphuric acid solution containing
0.35g/l potassium dichromate. Before
commencing pickling, oxides can be broken
up by a grit blast. Components that have
been pickled should be rinsed thoroughly in
hot, fresh water and finally dried in hot air.
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