passivation
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Why does stainless steel turn black when passivated with hydrofluoric acid?
Hydrofluoric acid cannot be used alone.
Could it be that the temperature and time weren’t controlled properly?
Keep exploring a bit more, haha:lol
Passivation is generally done using nitric acid and sodium hydroxide
Yes. Sometimes, with passivation treatment, people only keep in mind the main material and fail to realize that passivation is also a systematic process – it’s necessary to pay attention to the main components of the formula as well; P