I want to remove TiO2 and SiO2 coating from surface.
I think that i should use HCl and MgCl2 and an oxidation agent such as potassium nitrate, but i dont know in which propertion should these materials be mixed.any one can help me?
Dear Hosein Najafkhani ;
Depending on your case maybe you can use molten NaOH, as it composed of a strong cation (Na+) and anion (OH-) and thus has a very high electrical conductivity, and it has a very high solubility for oxides such as TiO2, Al2O3, and SiO2. More details in the following reference;
https://core.ac.uk/download/pdf/276265554.pdf
I guess to remove these coatings completely you need to use Hydrofluoric acid (HF) or Ammonium fluoride (NH4F). Since you can terminate the surface for a short time with hydrogen. The time before reoxidation is short (maybe 20 min to 1 hour). The process is often used in surface science before inserting the samples in an ultra-high vacuum.
In the past I used for TiO2 EDTA + H2O2, 50°C a couple of hours under stirring. It is easy and cheap and it should work if the coating is thin (no more than 1 micron) but it is not useful for SiO2. Best regards, Simone
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