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Stripping silicon oxide and titanium oxide coatings from aluminum

Question 1,
Any way to remove 4 plated layer in sequence of SiO2, TiO2, SiO2, TiO2 on an aluminum material 6061 without damaging the surface. Please advice.

Question 2,
Any way to remove 5 plated layer in sequence of SiO2, TiAlO, SiO2, TiAlO, SiO2 on an aluminum material 6061 without damaging the surface. Please advice.

Thanks,

Fong Lean Guik
Plating shop - Malaysia
2006

Try concentrated hydrofluoric acid.
It should dissolve the oxides and leave the aluminum covered with a thin white film of AlF3.

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
2006

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