Bearing rust work is an important task, especially rust process, like the bearings in the heat treatment shop pickling, cleaning, grinding, there are many processes. Water production when the product is not a sequential processing is necessary to save the library in the middle after the storage process between the bearing rings must be antirust.
The inter-process rust commonly used methods are the following:
1. Soaked in rust-proof tank
Bearing trap immersed in an aqueous solution of 5% sodium nitrite and 0.6% sodium carbonate, rust-proof effect is still good, but many anti-rust tank and other equipment, take up a lot of space, the management is not easy.
2. Dip concentrated sodium nitrite solution
After washing the product, immersed in a 15% -20% sodium nitrite and 0.6% sodium carbonate solution, and then it is stacked up. Using this method its rust shorter period of time, generally only for 7-14 days, but in the rainy season due to the wet weather, only for 2-3 days
Must re-processing, labor and money it takes.
3 oiled
The same as the finished coated with anti-rust oil. This method must be cleaned before the next process is too much trouble.
New rust-proof process for
Joint research and related manufacturers, years of production practice shows, a number of improvements, inter-process rust Shower Spray rust better. Initial roller antirust trial, the semi-finished and finished products daily sodium nitrite solution rinse, three months after testing results found no corrosion, leaching jet rust now bearing trap semi-finished products, so the effect. The Shower Spray rust process is relatively simple, as follows:
Equipment acquisition and construction
According to store the number of semi-finished products, the establishment of an intermediate library ground with cement floor, in the middle can be set to a walkway, about 1.5m, the car used to access the bearing rings. Put a storage of an aqueous solution of sodium nitrite pool at the end of the tunnel, the solution formulation of 5% -10% sodium nitrite and 0.6% sodium carbonate, and the well in the floor back to the gutter, and after bearing rings stacked in the both sides of the floor on each pile bearing rings keep 0.6m aisle. Can speak intermediate library design is about 64m2, 1m3 aqueous solution of sodium nitrite pool.
2. Process method
Every morning, rinse with aqueous sodium nitrite aqueous solution by the water pump from the pool suction, rubber pipes pass to the showerhead, like shower spray rinse as bearing rings. Rinse aqueous solution by the back ditch flow back into the pool, and the upper end of the pool in the back ditch a filter to textile dust dirt logistics into the pool with a fine wire mesh and gauze. Intermediate library shelf life clean.
Solution of the pool every two days for testing based on test results supplement pool solution replacement period ,4-September every two weeks to completely swap different month, October - March the following year, the monthly exchange time.
Conclusion
Shower spray rust prevention, management is more convenient, but also saves labor, past the middle of the library with two individuals rust also can not be completed, and now a person can also cater to other work from rust-proof effect very significant. In March 2003, 7,002,136 and 3620 roller 4000 tablets pouring jet rust, nearly a year remains very bright, no rust. In addition, consumption of chemicals also saving roller workshop monthly consumption of more than 4000 kg of sodium nitrite, and now only 200 kg, saving nearly half.
The Shower Spray antirust law after the test with the use of the relevant manufacturers in recent years, proved very suitable, large, multi-volume, long cycle bearing semi-finished products.
3.1 corrosion caused by the following main reasons:
1, some enterprises in the process of production of bearings is not strictly in accordance with requirements for cleaning rust procedures and oil seal anti-rust packaging bearing parts and assembly process finished rust treatment. Such ferrule in the turnover process turnaround time is too long, and the outer ring cylindrical contact with corrosive liquids or gases.
Quality, some enterprises in the production of rust, cleaning products such as kerosene amounted to less than the requirements set by the technology.
3, the bearing steel prices dropped lower and lower, resulting in bearing steel gradual decline. Such high levels (elevated sulfur content of steel in the material decline in anti-corrosion performance), the deviation of the microstructure of steel in non-metallic impurities. Now production enterprises with more complex sources of bearing steel, and the quality of steel is the mixture of ichthyosaur.
4, some enterprises in poor environmental conditions, the high content of harmful air turnover venue is too small, it is difficult to carry out an effective anti-rust treatment. Coupled with the hot weather, the phenomenon is also no lack of existence of production workers in violation of antirust rules and procedures.
5, some companies rust paper, nylon paper (bags) and plastic tube bearing packaging materials do not meet the requirements of the rolling bearing oil seal rust-proof packaging is also caused by the corrosion of one of the factors.
6, some enterprises bearing rings Turning margin and small grinding allowance, the oxide scale on the outer circle of decarburization is also one of the reasons not completely removed.
3.2 bearing the identification of the corrosion.
Determination of rust pit depth, the naked eye: To observe the appearance of corrosion status of imported bearings. 2 (5 to 10 times) with a magnifying glass to further observe the imported bearings appearance rust state. 3 aid of a microscope (25 ~ 100 times), analysis of the corrosion product. Analysis to identify the corrosion reasons. 4 is usually based on the corrosion level, corrosion can be divided into three types: 5 light rust: the imported bearings appearance lost metallic luster appears dark gray. 6 in rust: the imported bearings appearance appear yellow, red brown, hazel or a small amount of rust powder. 7 heavy rust: imports bearing the appearance of a black the flaky rust layer or raised Xiuban.
 



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