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topic 5888

Anodizing Titanium Difficulties


(2000)

I am a jewelry manufacturer in Australia and I realize from reading many of your past letters a lot of your members have considerable knowledge in the plating of titanium. We are trying to get consistent results in various colours anodizing wedding rings.

We have a variable 100 volt rectifier x 5 amps which we do not have control over. The solution we are using is 10%water, 10%sulphuric acid and 80% phosphoric acid. The cathode is platinized titanium mesh and the anode (ring)is being connected by 3 mm copper wire.

Unfortunately when we perform the process the amperage increases much quicker than the voltage the maximum voltage I can produce before the D.C overload cuts in is about 20 v, and although we may reach 20 v the anodizing is only a faint yellow. Do we need to be able to adjust our amperage down, is there a particular cathode to anode ratio we should work to. Any assistance helping us to get an accurate and consist setup would be greatly appreciated. Regards A. Jackson

Aaron Jackson
- Australia


(2000)

I doubt if you will ever anodize with that strong of an acid solution. Try using a 7% trisodium phosphate [linked by editor to product info at Amazon] in distilled water and you will have enough amperage to anodize and not exceed the shutdown amperage. This will also allow you to get to your 100 volts. A plus, it is totally non hazardous. Reason, it is less conductive. What you have now is the crude equivalent of a dead short.

James Watts
- Navarre, Florida



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