Letter 3503

How you doing the plate on titanium. 

Wed -

How you doing the nickel plate on titanium.

Method 1: 1.Alkaline degresing with 50 g/l NaOH 50 g/l NaCO3 2.Rinse 3.Ething in hydrocloric acid time 3 minuts 4.Rinse in Rhochell salt acid 5.Cupper strike 50 g/l and 160 Rochellsalt acid in 5 minuts 0,4 A/dmž 6. Rinse in sulfuric acid.

Method 2: 1. Alkaline degresing with 50g/l NaOH 50g/l NaOH3 2. Rinse 3. Wet blasting with aluminiumoxide carefully ower the part. 4. Activation 325-450 g/l hydrofloric acid 3 minut after gasing. 5. Neutralising in 50g/l potasiumtartrat 6. Cupper strike See method 1: After one of these step you can plate nickel or chromium.

Good Luck to all. Regard Anders. S

Anders Sundman     surface finishing engineer Sweden

I would suggust that you try the cycles in Electroplating Engineering Handbook edited by L.Durney.

Titanium passivates very rapidly so there can be no delay between tanks.

I assume that you are on 6-4 Ti. Watch your caustic step as it can cause problems by etching out some of the aluminum.worm pitting.

I am in favor of a nickel strike, high acid low nickel and then directly into the nickel plate tank with minimal rinsing.

I wood skip the neutralizing step after the HF activation.

I would also activate in a 35-45% nitric and 4-5% HF. It works fine and is less critical. This chemically polishes as well as activates. If this is too slow, try it in the lab, gradually increasing both acids. 7 nitric to 1 HF is as low as you should go in the ratio, and 14 - 1 is the weakest HF ratio.

James Watts
- FL

Hi Jim. We already use methods number 1 without no problem. About method number 2 I can see that be wrong with using hydroflouric acid but I mean hydrocloric acid. We have no problem with etching step. Obvius that's exist moore way to do plating on Titanium. I'm going to buy that book you recommend from the book store. Thanks for your answer Jim.

Regards

Anders Sundman
Sweden

Answer or follow-up on this subject

 

Post a new question or inquiry on a different subject

 

This is a monitored forum. If you spot broken links or obsolete info, please advise!