I need an advise. How to etch welded joint of Nickel alloys ( groups 42 and 43 according to EN ISO 15608)?

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Amrit Raj Paul

You can either use diluted Aqua regia or Kallings' 2 reagent.

The aqua regia will give better yield but a bit slower whereas Kallings' 2 will yield faster.

Hamza Suharwardi

You can use acetic acid + HCl or HF concentrated for 4sec

Abdulaziz Albannai

https://www.rolledalloys.com/shared-content/technical-resources/databooks/AL-6XN_DB_US_EN.pdf