How to deal with the
blackening and rusting problems of screws?
When dealing with the blackening and rusting problems of precision screws, Huaduo Hardware Fasteners and Screws Factory needs to consider multiple aspects, including cleaning, rust prevention and daily maintenance. The following are some specific treatment methods and suggestions:
1. Dealing with the blackening problem
- Thorough degreasing:
Before the blackening treatment, it is necessary to ensure that the oil on the surface of the screw is completely removed. The blackening liquid at room temperature is acidic and has no degreasing ability, so the degreasing step is crucial.
The degreasing method can be selected according to the actual situation, such as using solvent cleaning, alkaline cleaning agent or emulsified cleaning agent.
After degreasing, it is necessary to rinse and rinse to ensure that the floating oil is removed to avoid re-contamination of the bolts.
- Control the growth time of the blackening film:
The growth time of the blackening film of screws of different materials will be different when they are blackened.
The growth time of the blackening film of various materials should be carefully observed and mastered. When a uniform gray-black film is formed, the blackening treatment should be stopped immediately.
After blackening, stay in the air for 1-2 minutes before entering the next process, which can improve the bonding strength and blackness of the film.
- Check the quality of the blackened film:
After the blackening process is completed, the quality of the blackened film should be checked.
If there are spots, exposed bottom, blackening by hand, etc., the cause should be checked in time and the quality of the blackened film should be improved.
2.Dealing with rust problems
- Preliminary cleaning:
Use sandpaper, brushes or professional cleaning tools to gently wipe the rusted part of the screw to remove rust and impurities on the surface.Be gentle when cleaning to avoid damaging the threads or heads of precision screws.
- Use solvents or cleaners:
Apply solvents or cleaners such as alcohol, acetone, vinegar, etc. to the screws to remove rust and corrosion. These solvents or cleaners help dissolve rust and make it easier to remove.
- Use screw cleaners or pickling agents:
For precision screws with severe rust, it is recommended to use professional screw cleaners or pickling agents.
Screw cleaners usually contain special chemical ingredients that can quickly and effectively remove rust and corrosion.
Although the pickling agent is effective, it needs to be used with caution and make sure to wear protective gloves and glasses to prevent corrosion to the skin or eyes.
- Apply anti-rust oil:
After the screws are processed, apply a thin layer of anti-rust oil.
Anti-rust oil can effectively isolate the contact between air and the surface of the screws, thereby slowing down the rusting of the screws.
3.Daily care and maintenance
- Choose the right material:
Try to choose stainless steel and other materials with good corrosion resistance to make screws.
- Keep dry:
Place the screws in a dry and ventilated environment to avoid rusting in a humid environment.
- Regular inspection:
For precision screws that are used for a long time, it is recommended to check their rust regularly and deal with them in time.
- Use black anti-rust oil:
If you need to further improve the anti-rust performance, you can use black anti-rust oil to further treat the blackened screws.
Black anti-rust oil can enhance the corrosion resistance of the surface of precision screws and extend their service life.