passivation
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In the pickling and passivation process using hydrofluoric acid and nitric acid as the passivating solution, how can damage to automatically welded seams be avoided?
For the pickling and passivation process in the passivation solution, using only hydrofluoric acid and nitric acid as the pickling solution can cause corrosion on the metal surface, especially in the weld areas and the heat-affected zones of those welds. Therefore, a certain amount of corrosion inhibitor can be added to the pickling solution to prevent metal corrosion; it is advisable to consult a professional cleaning company for this purpose.
Buffer was added; a small amount had little effect, while too much of it caused the surface to turn black and could not be cleaned off
Find a company specialized in chemical cleaning for consultation, or conduct corrosion inhibitor tests and screenings if possible.
It depends on what material you are made of; choose a different corrosion inhibitor accordingly
Stainless steel, 316L and 304