Hello everyone,
I am looking into plating Ti-6Al-4V products with a bright nickel solution in an industrial environment (using standard wet electroplating solutions).
I have found several solutions to etch titanium and remove the oxide layer, using for example ammonium bifluoride / nitric acid , or hot hydrochloric acid.
I am now looking for an agent that would allow me to prevent the oxidation of the titanium prior to the nickel strike and thus maximise the adhesion of the nickel.
Would anyone be aware of an existing solution or chemical that would do this ?
Thank you very much,
Best regards,
Elie
You answered your own question: titanium does not form oxide in the solutions that destroy this oxide (HF, HCl, H2SO4, H3PO4, (NH4)HF2 and some others). As soon as the titanium product is removed from these solutions, in the same second a thin TiO2 layer forms again on the titanium surface.
Thank you for your answer, I should reformulate my question, I am trying to prevent the formation of the oxide layer after the parts leaves the etchant and are exposed to air before being immersed in the woods nickel strike.
The fact of the matter is that this is impossible. You can not in any way prevent the oxidation of titanium in air, only in solution. The nickel plating solution should again dissolve the oxide film.
I am thinking of using a nickel fluoborate solution to increase the etching power (in comparison with woods nickel) and get rid of the newly formed oxidation layer following the etching.
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