Is the passivation treatment of stainless steel screws important

Is the passivation treatment of stainless steel screws important?

In the production process of stainless steel screws, such as the heading process or the 
turning process, the surface of the screw may be stained with iron filings or some 
relatively written particles generated during the process. If these are not removed, then 
It will affect the appearance of the screw surface or cause the screw to rust. Generally, 
this kind of surface treatment needs to be passivated to remove the impurities on these 

If the stainless steel screw is passivated, it will not only make the surface of the screw 
smoother and brighter, but also enhance the rust resistance and corrosion resistance of the 
screw. Because of different passivation treatments, the salt spray test time that can be 
passed is different, some can take 24 hours, and some can pass 1000 hours. This requires 
the customer to actively express how long the salt spray test will take. Otherwise, the 
screw manufacturer will basically handle the screw in accordance with the standard 
passivation treatment.

If the stainless steel screw is processed according to the standard passivation, it can 
basically only pass the salt spray test for 12 hours, which cannot be longer. Therefore, 
when passivation is to be done, it is necessary to inform the screw manufacturer of its own 
requirements, otherwise the effect will be different from what you actually need.


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