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Titanium acid etching with oxalic acid - reaction mechanisms

I am a student in bioengineering that have used acid etching with oxalic acid ⇦this on eBay or Amazon [affil links] to treat sandblasted and machined titanium. I 'd like to know if someone can tell me what reactions happen at the surface-solution interface, how this acid attach the surface and what gases are produced by this reactions. I have read that titanium oxalate is a by-product, is this responsible for the yellowish color of the solution?
thank you

Marco Cantini
titanium etching - Milano, Italy
2005

I'm having the same problem...

Thanks,

Andrea Finollo
- Genova
2006

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