Anodization is the process of coating the surface of a material with metal oxides, in order to strengthen the surface and protect it from corrosion and abrasion. When anodized coatings become damaged, when the underlying base metal becomes damaged, or when the base metal needs to be reshaped, you must remove the anodized coating. While the actual process of de-anodizing -- involving immersion in a hot acid stripping bath -- is straightforward, always consult with an experienced professional and observe chemical safety practices.
- Stainless steel bath
- Deionized water
- Gas firing apparatus
- Nitric acid
- Oxalic acid
- Chemical-resistant lab gear (goggles, coat, gloves)
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Instructions
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1
Fill a large (400 gallon capacity) stainless steel tank with deionized water. Heat the water to between 140 and 160 degrees Fahrenheit. Add nitric acid and oxalic acid. Solution should contain between 1.5 and 20 percent oxalic acid, by weight, and between 3 and 20 percent nitric acid, by weight.
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2
Add additional deionized water to the tank, if necessary, to make the total liquid content of the tank about 380 gallons. Keep the temperature of the tank between 120 and 160 degrees Fahrenheit.
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3
Add braided fuel fittings to the tank. After 15 minutes, fittings should be deanodized.