I have come across a suggestion to use HF and HNO3 mixture. But exact ratio is not clarified. What should be the exact ratio of these two acids to smoothly pickle Ni sheets? Any impurity in form of oxides must be absent before electrodeposition.
Use high purity acids and deionised water to prepare solution. I think you starts ratio with 3 parts HNO3 to 1 part of HF
Hi Lucky,
Thought am not sure the reason in choosing these 2 strong acid to work in your processing for pre-cleaning of Nickel sheets.
*** Watching the environmental issue as HF is never an easy item to control.
Suggestion to verify the purity of your Ni-sheet.. Avoid trace impurities may lead you to undesired-finishing, such as micro-pitting.
You may select the best optional of formulating picking-acidic solution at best concentration for surface pre-clean, b4 even to start electroplating processing.
Good luck.
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