How to Remove Anodizing From Aluminum

eHow may earn compensation through affiliate links in this story. Learn more about our affiliate and product review process here.

Things You'll Need

  • Gloves

  • Goggles

  • Tongs

  • Phosphoric acid

  • Water

  • Metal tub

  • Heating tool, such as a propane grill or torch

  • Thermometer

Through an anodizing process, aluminum is made stronger and more durable by being placed in an acid bath. Invented in the 1920s for military use, anodized aluminum became popular in architectural applications in the 1960s and 1970s because of its bright colors and inexpensive cost. Anodized aluminum is used today in cookware, home decorating, electronics and sporting goods. In all applications, anodized aluminum provides resistance to corrosion and a surface that allows for better adhesion of glue or color applications. Sometimes, however, you might prefer to remove the anodizing to reveal the original alumium surface.

Advertisement

Step 1

Pour water into a heat-resistant metal bin or a tub large enough to submerge the aluminum part you are stripping.

Video of the Day

Step 2

Put on safety glasses and rubber gloves. Mix 1 gallon of phosphoric acid into your container for every 4 gallons of water.

Advertisement

Step 3

Clip a thermometer to the side of the container. Heat the water to 200 degrees, using a gas grill or a propane-operated torch.

Step 4

Fully submerge the aluminum part into the heated chemical mixture, using tongs to reduce splashing.

Advertisement

Step 5

Remove the part from the water after three minutes. If anodizing is still present, put the part back in the water for another minute, or until the anodizing is fully removed.

Step 6

Rinse the treated aluminum part with clean water from a hose or faucet to remove all traces of the phosphoric acid.

Warning

Properly dispose of the phosphoric acid solution; check with your municipality if you're unsure how to proceed.

Advertisement

Video of the Day

references