Is it beneficial to passivate steel parts products for a long period of time？
Author: Robby
Passivation time is not necessarily beneficial, too long passivation time may affect the quality of steel parts products.
I. What is passivation?
Passivation is a surface treatment that prevents metal corrosion by reacting the metal surface with certain solutions to form oxides or other compounds that cover the surface. After passivation, the surface of steel parts products have good corrosion resistance and decorative properties.
Second, the impact of passivation time on steel products
Although the longer the passivation on the surface of the steel parts of the product the better the protection, but too long a time may also affect the quality of the steel parts of the product. Specifically, long passivation times can lead to the following problems:
1. Reduced surface quality: too long a passivation time can lead to uneven aging marks on the surface, allowing cracks and peeling to occur, thus reducing the quality of the surface.
2. Increased risk of corrosion: If the passivation time is too long, the resulting oxide layer will become too thick, which in turn will increase the chances of moisture and oxygen getting inside the metal, thus increasing the risk of corrosion.
3. Waste of resources: too long passivation time will waste resources and increase production costs.
Third, a reasonable range of passivation time
Although different steel products and different passivation materials need different time, but in general, the passivation time should be controlled between 10-60 minutes. If you pursue the time too much, it may affect the quality of the steel parts products.
How to control the passivation time?
Reasonable control of passivation time is essential to ensure the quality of steel parts. The following factors can affect the passivation time:
1. the type, formulation and concentration of the passivate;
2. the type of metal;
3. the temperature;
4. the quality of cleaning and treatment prior to surface preparation.
Therefore, in order to ensure the passivation time, the process parameters should be well understood and tested before passivation to find the optimum passivation time.
[Conclusion] Although the longer the passivation time is, the better the protection of steel parts products, too long a time may affect its quality. Therefore, a reasonable control of the passivation time is essential to ensure the quality of steel parts products.