After the production of stainless steel screws is completed, many of them are directly cleaned and then packaged and shipped.

Does it need to be passivated? In fact, although stainless steel screws have super anti-rust properties, they still need some passivation treatment.

We know that the anti-rust of carbon steel screws is electroplating or other treatments on the surface.

In short, the screw is completely wrapped with a layer of anti-rust material to isolate it from the air.

As for stainless steel screws, due to the different material characteristics, they can be directly exposed to the air.

However, if the environment is particularly harsh, stainless steel screws will also rust.

In order to improve the anti-rust performance of stainless steel screws, we can passivate stainless steel screws once to improve its anti-rust effect.

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How to passivate stainless steel screws?

The so-called passivation treatment is the use of passivation liquid to soak stainless steel screws.

Standard passivation liquids are sold in barrels, and are sold in general chemical plants.

The passivation liquid itself is also a must for stainless steel screw manufacturers. Material, passivation liquid is suitable for all 200, 300 and 400 stainless steel material series.

The oxidation resistance of passivated stainless steel screws is greatly improved.

If there is no passivated stainless steel screws, the salt spray test time is 48 hours, then the passivated stainless steel screws can take up to 72 hours.

The effect is relatively obvious. If the color of the stainless steel screw is not bright and cannot be removed during the cleaning process, then passivation once can also improve the surface gloss of the stainless steel screw.

Therefore, it is necessary to passivate stainless steel screws, the cost of passivation is not high, the operation is simple, safe and reliable.

Specific passivation process

First, clean the screws briefly, and then put the stainless steel screws in a container of passivation solution and soak them for about fifteen minutes.

Then connect the power supply and let the container heat up to about 60 degrees for about 15 minutes.

After some simple cleaning with sodium hydride, it can be taken out and packaged.

The passivated and heated liquid turns red, indicating that it has been passivated, and the passivated stainless steel screw is much brighter.