[gadang]

Dear All..

I have no idea to clean my specimen especially Nickel Alloys ( Ni-Si-Ti, Ni-Si-Ti-Mo, Ni-Si-Ti-Al, Ni-Si-Ti-Cr, and Ni-Al-V-Nb-Ta) from corrosion product ( andherent oxide).
I had tried to clean by using HCl and H2SO4, and also HF 27.57 M but it is nothing...,
I also tried to immerse 1 part HCl, 2 part distilled water in hot water, especially Ni Alloys (Ni-Al-V-Nb-Ta), it wasn't different of weight loss.

Please give some advice how to clean with certain solution ?,

Thank you