shandong KNJ Bearing Co.,Ltd.
This paper summarizes the causes of rust and corrosion of hardware parts such as bearings.
1. The quality of antirust lubricating oil, cleaning kerosene and other products used by some enterprises in production can not meet the requirements of process and technology regulations.
2. As the price of bearing steel falls again and again, the material of bearing steel gradually declines. For example, the content of non-metallic impurities in steel is high (the increase of sulfur content in steel reduces the corrosion resistance of the material itself), metallographic structure deviation, etc. At present, the sources of bearing steel used by production enterprises are miscellaneous, and the steel quality is fish dragon mixed beads.
3. The environmental conditions of some enterprises are poor, the content of harmful substances in the air is high, and the turnover site is too small to carry out effective antirust treatment. In addition, the hot weather and the violation of rust prevention regulations by production workers also exist.
4. The turning allowance and grinding allowance of bearing rings in some enterprises are too small, and the oxide scale and decarburization layer on the outer circle cannot be completely removed is also one of the reasons.
5. In the process of producing bearings, some enterprises do not carry out anti rust treatment on the bearing parts in the processing process and the finished bearing products after assembly in strict accordance with the requirements of cleaning and anti rust regulations and oil seal anti rust packaging. If the turnover time of the ferrule is too long in the turnover process, the outer circle of the outer ring contacts corrosive liquid or gas, etc.
6. The bearing packaging materials such as antirust paper, nylon paper (bag) and plastic cylinder of some enterprises do not meet the requirements of antirust packaging of rolling bearing oil seal, which is also one of the factors causing corrosion.