The daily maintenance and upkeep of fasteners should pay attention to the following points

The daily maintenance and upkeep of fasteners should pay attention to the following points

1、 When quenching fasteners, silicate cleaning agents should be used to remove impurities, followed by careful rinsing to avoid leaving impurities on the fasteners that may affect their normal use

2、 After tempering treatment, fasteners may show signs of discoloration. After soaking the fasteners in the solution for a period of time, oily substances will be produced, indicating that the fasteners are not clean enough. After analysis, it was found that the slight oxidation of the fasteners in the quenching oil was caused by improper stacking during heating

3、 If there is a white substance on the fastener, it is likely to be some phosphides. The reason for this phenomenon is that an acidic cleaning machine was not used for cleaning, and the inspection of the rinsing tank was not thorough enough

4、 Higher strength screws have a uniform and smooth oil black outer surface due to quenching waste heat blackening. After testing, it was found to be caused by alkaline sickness. So in steel fasteners, surface alkaline substances cannot be removed in quenching oil, which can cause surface diseases at high temperatures and exacerbate damage during tempering. It is recommended to thoroughly clean and rinse the fasteners before heat treatment to completely remove any alkaline residues that may cause the fasteners to become ill

5、 For large-sized fasteners, polymer aqueous solution quenching is often used. Before quenching, an alkaline cleaning machine is used to clean and rinse. After quenching, the fasteners have rusted on the inside. So it is necessary to frequently change the rinsing water to protect the fasteners from rusting during rinsing

6、 High strength fasteners often have some black stripes, which are surface residues of pollutants, dried quenching oil, and the evolution of gas-phase substances during the quenching process. Due to excessive aging of quenching oil, it is recommended to add new oil

After a fastener malfunctions, it will first affect the performance of the fastener itself, and then it may affect the use of the entire mechanical equipment. Therefore, the above issues must be given sufficient attention. Just like humans, only by paying attention to life can the possibility of actual illness be reduced. The key to fastener maintenance is to reduce malfunctions and extend the service life