Clean, simple way to strip oxide from aluminum.

[Mike_In_Plano]

Hello All,

I'm normally over on the electronics forum, but recently I had a problem crop up regarding the spot welding of aluminum foil. I've seen the end results of the process, so I know it can be done cleanly. For that matter, I've seen pieces that predate laser welding, etc, so I'm confident it doesn't involve exotic technologies.

My question is this:

Given that I can process and weld the foil in a glove box, what would be the best ( cleanest / safest ) way to prep the foil for welding ( i.e. strip off oxide and leave a clean surface )

Thanks in advance,

Mike

 

[mgb_phys]

800 grit sandpaper ?
Or Phosphoric acid

 

[quicknote]

As a scientist with a background in materials science and engineering, I can offer some suggestions for a clean and simple way to strip oxide from aluminum. One method that is commonly used is chemical etching, where the aluminum foil is immersed in a solution that can dissolve the oxide layer. This can be done using a solution of hydrochloric acid and water, or a mixture of nitric acid and water. However, these solutions can be hazardous and require proper safety precautions.

Another option is mechanical polishing, where the oxide layer is physically removed by abrasion. This can be done using a fine-grit sandpaper or a polishing wheel. However, this method may not be suitable for delicate aluminum foils.

A more specialized technique called anodic stripping can also be used. In this process, the aluminum foil is immersed in a solution and a small electrical current is applied, which causes the oxide layer to dissolve and be stripped away. This method is more controlled and can be used for thin and delicate foils.

Ultimately, the best method for stripping oxide from aluminum will depend on the specific requirements and limitations of your project. I recommend consulting with a materials engineer or conducting some small-scale experiments to determine the most suitable and safe approach for your particular application.