Corrosion, which not only affects accuracy and surface roughness, but also reduces service life, even scrapped and cannot
use.
Bearing anti-rust work is an important task, especially the rust prevention between processes, like the bearing in the heat treatment workshop after pickling, cleaning, grinding, there are many processes. When the product is not produced by running water, sequentially
After processing, it is stored in the intermediate warehouse, so the bearing rings stored between the processes must be rust-proof.
The conventional anti-rust oil anti-rust method similar to rust-proof paint and the methods for preventing rust between the bearing processes are generally the following:
1. Dip in the rustproof tank
The bearing ring is immersed in an aqueous solution of 5% sodium nitrite and 0.6% sodium carbonate. The anti-rust effect is good, but many rust-proof tanks and other equipment occupy a large amount of space, and management is not convenient.
2. Dip coating of concentrated sodium nitrite solution
After washing the product, it is immersed in a solution containing 15%-20% sodium nitrite and 0.6% sodium carbonate, and then stacked. In this way, the rust-preventing period is short, generally only 7-14 days, and in the rainy season, due to the wet weather, it can only be re-treated after 2-3 days, which requires labor and money.
3. Oiling
Apply anti-rust oil like anti-rust paint like finished product. This method must be cleaned before the next step is performed, which is troublesome.
Introduction of new anti-rust technology
After working with relevant manufacturers, many years of production practice has shown that the rust prevention between processes has been improved several times, so that the rust-proof effect is better. Initially, the rust prevention of the roller was tested. The semi-finished product and the finished product were washed once a day with an aqueous solution of sodium nitrite. After 3 months, no rust was found in the test results. Now, the semi-finished product of the bearing ring is spray-proof and rust-proof, and the effect is also the same. The spray-type anti-rust process is relatively simple, and the method is as follows:
1. Purchase and construction of equipment
According to how much semi-finished products are stored, an intermediate warehouse is built. The ground floor is made of cement floor, and a walkway can be set in the middle, about 1.5m, which is used to pass the bearing ring. Place a pool of sodium nitrite solution at the end of the channel. The solution is formulated with 5%-10% sodium nitrite plus 0.6% sodium carbonate, and the backwater groove is made on the ground, and then the bearing rings are stacked on both sides of the floor. Above, there is a 0.6m walkway between each pile of bearing rings. It can be said that the intermediate library is designed to be about 64m2, and its sodium nitrite aqueous solution pool is 1m3.
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