Stainless screw in the production process, is it necessary to passivate?

We all know that stainless steel has abilities in oxidation resistance and corrosion resistance. In many environments, it can be directly exposed to the air, so why will there be customers requiring stainless screw to do passivation treatment? Is that really necessary?

Although stainless screw has a strong rust resistance, in some particularly harsh environments, it still will rust. Therefore, in order to improve the rust resistance of screws, it is necessary to carry out a passivation treatment.

Under normal circumstances, passivation treatment is at room temperature with passivation solution to soak the screws cleaning for 15 minutes, and then heated to 60 degrees or so soak for 15 minutes, such as the liquid into red, the treatment is completed. Passivation treatment can increase the salt spray test time by 12 hours, and can effectively improve rust resistance.

In addition to improving rust resistance, passivation also brightens the surface of the stainless screw. For some customers who require a good appearance of screws, passivation is one of the options with low cost, simple operation, and good effect.

If you want to know more about stainless screw or other kinds of screws, you can comment below the Shi Shi Tong Screw Manufacturer.

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