Pickling and passivation of stainless steel equipment
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I’m seeking help from experts. The bolt material is A2-70. The component shown in the picture is an internal part of the equipment; after the bolts were connected to the equipment, they were pickled and passivated, but they turned yellow. Does anyone know what’s causing this?
This post was last edited by The wise are enlightened on 2018-9-10 at 17:17. Joke: Who has ever seen bolts and equipment being pickled together? How can the areas around the bolt holes be pickled after the bolts are tightened? Although both stainless steel bolts and stainless steel components are made of stainless steel, their materials differ. Can they not turn yellow when the same pickling solution is used for different materials? Generally, pickling is only applied to the equipment and internal components; stainless steel bolts do not need to be pickled – it’s unnecessary!
Pickling is only applied to the equipment and internal components; stainless steel bolts do not require pickling