Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Finishing of old titanium
2007
Dear Sir,
We are manufacturers of titanium baskets/titanium heating and cooling coils.
We buy titanium sheets in the form of scrap and we need to clean them in order to get the sparking finish.
hi-tech (India) - Delhi, India
Using scrap metal bothers me, but it may work for you. Typical cleaning would be a soak in a hot caustic solution (proprietary ones will work better) and then a dip/soak in a mixture of nitric acid and hydrofluoric acid in a ratio or 10 parts nitric to one part hydrofluoric. The nitric can be from 10% to 30%. Start on the low end and make adds to keep the speed in a useable range.
Rinse very very well after each step. A final dip in hot DI water helps to reduce spotting.
- Navarre, Florida
2007
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