What problem will screw manufacturers have when clear self tapping screws

The material for self tapping screw are usually stainless steel and carbon steel,generally speaking,the difficulty of clearing carbon steel self tapping screw for screw suppliers is usually after the heat treatment process and quenched.the matter is that the rinsing is not clear.Caustic soda remains on the surface due to irregular screw stacking,resulting in surface rust, quenched, and improper use of oil causes the surface of fasteners to rust

1. Unreasonable accumulation of screws. Carbon steel screws show signs of discoloration after quenching, which indicates that the fasteners received environmental pollution from cleaning agents and quenching during the rinsing period, and melted at the temperature of the heat treatment process, leaving organic chemical burn scars. The substance confirms that the surface of the fastener is not clean.

2. The rinsing is unreasonable. For large-size carbon steel self-tapping screws, polymer solution quenching is usually used. Before quenching, it must be cleaned and rinsed with alkaline cleaning solution. After quenching, the fasteners have been rusted on the inner side.

The analysis was carried out with a bright red spectrum analyzer, and it was confirmed that in addition to the compounds, there are also sodium, indicating that the inner side of the carbon steel self-tapping screw is stained with alkaline cleaner, which is likely to be carbon or similar chemical substances, which promotes its corrosion. The screw rinse is checked to see if there is excessive environmental pollution. It is also recommended to replace the rinse tap water frequently. In addition, adding rust imitation agent to the water is also a good way.

All in all, everyone should pay attention to these aspects when cleaning self-tapping screws.if you are looking screw manufacturers,screw factory,screw supplier,welcome to contact heatscrew.