Anodized Aeroquip fittings have been treated to have a coating of metal oxides. These metal oxides help to strengthen the surface, protecting it from corrosion and abrasion. However, sometimes it is necessary to remove anodized coating from Aeroquip fittings. Anodized coatings can become defective, due to either faults in the anodizing process or to abnormalities in the object. In addition, altering a fitting with an anodized coating may be difficult, due to the hardness of the anodized coating. In all of these cases, deanodization may be helpful and necessary. Here, we deanodize using a stainless steel stripping bath.
- Nitric oxide
- Stainless steel stripping tub
- Gas firing apparatus
- Deionized water
- Oxalic acid
- Chemical-resistant gloves
- Goggles
- Chemical-resistant lab coat
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Instructions
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1
Pour deionized water into the stainless steel stripping tub. Heat water, by gas firing, to 140 to 160 degrees. Add nitric acid and oxalic acid.
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2
Add deionized water so that the total volume of solution in the tub is around 380 gallons. The solution should be sufficiently clear that you can see through several feet of it.
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3
Put Aeroquip fittings in the tub. Leave the fittings in the tub for about 15 minutes, which should be sufficient for the fittings to be stripped of their anodized coating. Remove the fittings from the tub and rinse them with deionized water.