Letter 32023

Achieving roughness on cp titanium [Italy] 

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I am working on titanium cp to make it dull and rough by etching with Hydrofluoric and Nitric Acid bath. What are the bath conditions--acid concentrations, time and temperature?

Thanks a lot.

Rosario Ardia
chemist - Eboli, Salerno, Italy

Nitric/HF will probably brighten titanium. To dull the surface use a mixture of 8 oz/gal Potassium Hydroxide + 5% Hydrogen peroxide at room temperature. This will require 1 to 4 hours to produce a dull etched finish.

Jeffrey Holmes, CEF - Spartanburg, SC, USA

I am working with the Titanium cp grade 2 and I have realized the etching with a mixture of 8 oz/gal Potassium Hydroxide + 5% Hydrogen peroxide at room temperature. I have got brown surfaces that I presume to be titanium oxides with impurity of others metal, like iron. I would like to make more biocompatibility the surfaces by modify titanium surfaces in titanium oxides particularly TiO2. What kind of treatment can I test? Tanks in advance.

Rosario Ardia
- Eboli, SA, Italy

I have not seen that problem after etching with KOH/H2O2 mixture. Will a simple high pressure remove it?

Jeffrey Holmes, CEF - Spartanburg, SC, USA

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