Remove scratches from aluminum

Aluminum is a very soft metal. As a result, even slight pressure causes scratches in the light metal. So a good reason for the following guide to remove scratches from aluminum.

Techniques for removing scratches from aluminum

Depending on the specific alloy, aluminum can easily scratch. It is also relatively easy to remove scratches from aluminum. Depending on the depth of the scratches and the composition of the aluminum alloy, you can do this differently:

  • polish the aluminum
  • grind the aluminum
  • sandblast or sandblast the aluminum

Remove the aluminum scratches by polishing

Because aluminum is so soft, it can scratch even when using an unsuitable dishcloth. Especially when using the rough side. But also certain brushes or metal wool for scrubbing can scratch an aluminum surface considerably.

However, such scratches are not very deep and they can be polished well. How you proceed when polishing aluminum, we have described here in detail. Here you can also find out which polishing pastes you can use. If you do not want to polish to a high gloss, you must not use the appropriate polishing disc with scouring paste.

Remove aluminum scraper by grinding

In fact, grinding is the precursor of polishing aluminum. But of course you can also scratch this from the aluminum. In particular, when it comes to brushed aluminum or a similar surface finish, sanding is a good choice to restore the optical properties as well.

Remember, however, that you are removing material during grinding. Especially with thin sheets, you can not grind as deep as you like without compromising stiffness. For sanding, use a grain size of 100 to 400. How much you refine the grain, but also depends on how much you need or want to adapt the surface to the original surface.

Remove scratches from aluminum with sand or glass beads

Also the glass bead blasting is a way to remove scratches. Under "Aluminum sandblasting" we go into detail on it. Bear in mind that glass bead blasting will cause the surface to compact at the same time. The aluminum then appears silky matt. By compacting, dirt no longer sticks so well, meaning you will be less likely to clean such aluminum surfaces in the future.

Other special features by removing scratches on aluminum

By removing the scratches, the aluminum surface is changed, as a mechanical erosion takes place. This means that sanding, polishing or glass bead blasting also removes coatings such as coatings, plastics, etc. In addition, the oxide layer is also removed.

In addition to the naturally forming oxide layer, you can also oxidize aluminum. Anodizing is nothing but controlled oxidation. This means that you also get rid of the oxide layer when removing scratches.

Since the oxide forms by contact of the aluminum with oxygen, it will immediately oxidize again. In particular, if the oxide layer is needed, it must be renewed again.

Tips & Tricks

You can also remove deeper scratches on aluminum sheets such as bodies if you do not want to expose the aluminum sheet to oxidation. Grind the aluminum only enough to preserve at least the primer. Now fill the aluminum sheet very thinly with suitable fillers for aluminum. These processes are very similar to tinning steel sheets.

Video Board: Scratch repair