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Titanium Anodizing
Anodizing of Titanium can be accomplished in many different anodizing solutions from alkaline to acid and almost everything in between. Some of these baths are designed to achieve a specific result and finish. Much of this technology is proprietary and information on it is very difficult or impossible to obtain.
A general type of Titanium anodizing from a sulfuric acid anodizing bath has the following parameters.
- 155 to 200 g/l sulfuric acid
- 65-75 degrees Fahrenheit temperature
- 0-75 volts
- 5-15 amps sq ft.
- 15-20 minutes
- Glycol additive (optional)
Pretreatment steps
- As in all metal finishing a through cleaning must be accomplished, preferably in a strong alkaline cleaner, at 140-160 degrees Fahrenheit for a water break free surface. Electro-cleaning may be desirable but not required. 5-10 minutes.
- Rinse.
- Acid etch/activate in 20-50% nitric acid 1-3 minutes. For a more even surface the addition of fluoride is advisable.
- Rinse.
- Anodize at 10 ASF and 10-75 volts depending on final color desired. Color will vary with voltage and time from golden brown at 10 Volts / 20 min to blue at 75 Volts / 12 min.
- Rinse.
In addition to the above instructions, you can also look into SAE specification AMS 2488B for another type of Titanium anodizing.