I have performed solution heat treatment at 1050 C for 1 hrs followed by water quenching. A layer (black) is formed. How I can remove the layer as I have to perform chemical etching on the sample and until that the layer is removed chemical etching cannot be performed over the sample. Kindly provide your valuable suggestions....My material is 17-4 PH stainless steel.
Vadim Verlotski
Scale from stainless steel is easiest to remove by sandblasting or shot blasting.
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Safwan Al-qawabah
If neither nitric acid or hot CitriSurf formulations remove the scale, you probably have to go to nitric/HF solutions or Potassium Permanganate solutions. The hot KMnO4 is safer to use, but can be very messy. Of course, you can remove it with electropolishing.
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