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"3-D Printing: Removal of oxide on alloys"



April 18, 2017

Q. Hi,
I have a titanium alloy (TI-6Al-4v) which was 3D printed from SLM printer, which is heated to 450 °C in vacuum. Now I can't read the surface of the alloy for micro hardness through the tester because of the oxides formed on the alloy. How can I remove the oxides formed on the alloy to have a clear view of the surface?

kali pogula
project - australia
^


simultaneous April 19, 2017

A. When I had a Ti finishing job some years back, I used a 1:1 mix of HNO3 and HF. Scary stuff!

Ammonium bifluoride might work instead of HF.

dave wichern
Dave Wichern
Consultant - The Bronx, New York
^


April 19, 2017

? Are you saying that you can't properly see and measure the diamond indentation because of the oxide?

Ken Kirby
- Kenosha, Wisconsin, USA
^


April 24, 2017

We electropolish 3D printed titanium parts, but only small ones - the surface is very developed and consumes lots of AMPS.

60434

anna_berkovich
Anna Berkovich
Russamer Lab
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Pittsburgh, Pennsylvania 
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