Removing nickel from alumina boat? Post sintering?

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Vadim Verlotski

You're right. Concentrated hydrochloric acid will dissolve nickel. You can also use hot sulfuric acid.

Mirtunjay Kumar

Never happened with me. Try a better quality alumina plate/crucible. I am using product from ANTS Ceramic. https://antsceramics.com/

Carlos Araújo Queiroz

You may consider cleaning/leaching the nickel residue with conc. HNO3 + H2O (3:7 v/v) at room temperature.