Why Do Thin-walled Stainless Steel Capillaries Need Pickling Passivation?

Thin-walled stainless steel capillary to pickling passivation is to remove the surface oxide layer and impurities,

Because stainless steel in the process of processing will appear black, yellow oxide skin,

In order to improve the appearance and corrosion resistance of stainless steel,

The processed stainless steel must be pickled and passivated.

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