In order to better use fasteners, when we use fasteners, we need regular maintenance, such as regular cleaning of fasteners, which can improve the efficiency of fasteners. But when we clean the fasteners, we often find some problems, mainly the following common problems.
1. Pollution generated during rinsing
After quenching, the fasteners were cleaned with silicate cleaning agent and then rinsed. XX solid matter appeared on the surface. The infrared spectrometer was used to analyze this matter and it was confirmed to be inorganic silicate and iron oxide. This is caused by the incomplete rinsing and residual silicate on the surface of the fastener.
2. Unreasonable stacking of fasteners
Fasteners show signs of discoloration after tempering. Soak them to let oily residues remain after volatilization. Such substances are high in lipids. It shows that the fastener is contaminated by cleaning agent and quenching oil during the rinsing period, and it melts at the heat treatment temperature, leaving chemical burn scars. Such substances confirm that the surface of the fastener is not clean. For analysis by infrared spectrometer, it is a mixture of base oil and ether in quenching oil. The ether may come from the addition of quenching oil. The quenching oil analysis results in the mesh belt furnace confirmed that the fasteners are slightly oxidized in the quenching oil due to unreasonable stacking when heating, but it is almost negligible. This phenomenon is related to the cleaning process, not the quenching oil.
3. Surface residues
There is a white residue on the high-strength screw, which was analyzed by infrared spectrometer and confirmed to be phosphide. No acidic cleaning agent cleaning was carried out, and inspection of the rinsing tank found that the tank liquid had a higher carbon solubility. The tank liquid should be poured out regularly, and the concentration level of the lye in the rinsing tank should be checked frequently.