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topic 54346


February 11, 2010

I am a metal sculptor I like to incorporate anodized titanium in work for color accents. I have pretreated the Ti with a commercially available non acidic material from Reactive Metals. The results are good but are muted. I know there is an acidic pretreatment that has been traditionally used. Anyone have knowledge of this. I know the inherent dangers but have all the safety precautions. thanks

Bob Bass
artist - Monmouth, Oregon

February 18, 2010

Titanium develops an oxide scale rapidly in air. You could either: 1) mechanically abrade it with wet/dry paper right before anodizing or 2) use a nitric/HF mixture to descale it. The latter is a pretty scary brew that will burn holes in you, but it's what I used when I did some hobby titanium finishing. Good ventilation is essential.

dave wichern
Dave Wichern
Consultant - The Bronx, New York

February 18, 2010

Go to a truck stop and get a jug of brightener for aluminum or SS semi trailers. Look for one that contains hydrofluoric acid, or ammonium bifluoride or fluoboric acid.
It is still nasty stuff, but reasonably safe IF you follow the instructions.

James Watts
- Navarre, Florida

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