DIY: Anode Phosphor Coating
Anodizing is an increasingly popular method of coating the surface of a metal with a layer of oxides. Not only does anodizing increase the hardness of the surface, it also adds a layer of porosity, which makes it easier for the surface to bond to adhesive or paints. Finally, anodizing can tint the surfaces of metals in interesting and unusual ways. Phosphoric acid coating is particularly appreciated for its ability to increase the porosity of the surface of a metal, thus making it more suitable for applications concerning dye or adhesive.
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Things You'll Need
- Phosphoric acid
- Distilled water
- Ceramic tub
- Heating plate
- Two-electrode system
- Voltage current source
Instructions
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Make a solution of 20 percent phosphoric acid and 80 percent distilled water in the ceramic tub. Place the solution on top of the heating plate, which should be set to "off."
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2
Attach the metal to be anodized to the positive end of the two-electrode system, and attach the voltage current source to the negative end of the two-electrode system.
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3
Immerse the two electrodes, and the metal to which they are connected, in the phosphoric acid solution.
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4
Turn on the voltage current source. Heat the solution until it reaches 176 degrees Fahrenheit and leave the metal in the solution for about 20 minutes.
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5
Use tongs to remove the metal from the solution and wash the metal thoroughly with distilled water. Dispose of the phosphoric acid solution in an appropriate hazardous waste receptacle.
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Tips & Warnings
Wear gloves, goggles and a lab coat for safety purposes.
