Anodizing strengthens the surface of cast aluminum by establishing an aluminum oxide coating; however, it also makes the surface porous. While the porosity of the surface may be advantageous because it helps dyes better adhere to the aluminum, it also makes the aluminum more vulnerable to corrosion-causing chemicals. You can easily test the seal of anodized aluminum at home, using a few products that you can order online.
- Nitric acid
- Distilled water
- Ceramic tub
- Anodized aluminum dye
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Instructions
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1
Mix nitric acid and distilled water in equal proportions to make a 1:1 solution.
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2
Use a paintbrush to brush the nitric acid solution over the surface of the cast aluminum.
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3
Mix the anodized aluminum dye solution, per manufacturer's instructions, in the ceramic tub. Immerse the aluminum in the dye solution for five minutes.
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4
Remove the aluminum from the dye solution with tongs and wash it with distilled water.
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5
Look closely at the surface of the aluminum. Any evidence of dye is evidence of inadequate sealing.