Aluminium etching mechanisms involve formation of aluminium oxide using aluminium etchant. Yet, if we want to selectively etch aluminium, can some recipe be made for that? Is it possible the other way round?
Hi Sinha.
Yes, it is definitely possible to etch Al selectively which is on top of Al2O3 using dry etching. This is one of the most commonly used process and should be able to find quite easily online. But, when it comes to wet etch it could be an issue for such structures to etch.
We use 5% water solution of acids mixed as follows: HCl:HNO3: HF = 1:1:2
you can etch using simply CuCl2 solution at room temperature. It will etch Al without touching Al2O3
Dear Soumendu, you can etch using Sodium hydroxide solution 2% NaOH with water at the temperature between 60-70 C. After finish, you will wash by water even remove the salt formed on the metal surface.
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