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Bearing knowledge - bearing and bearing steel rust some questions

Bearing knowledge - bearing and bearing steel rust some questions

2021-05-17

Question one: Will bearing steel rust?

Will rust.Bearing steel, including stainless steel, rusts.

Although stainless steel is known as stainless, it is also rusty, in fact, there is no stainless steel in the world!

Question two: how does the bearing steel rust?

The so-called stainless steel, refers to the degree of corrosion resistance is different.

When the corrosion speed is less than 0.01mm/y, it is considered "completely corrosion resistant";

Corrosion speed < 0.1mm/y, it is considered "corrosion resistance";

Corrosion speed > 0.1mm/y, it is considered "corrosion resistance", that is, general steel.

In addition to a small part of bearing steel is stainless bearing steel, most of it is ordinary corrosion resistance steel, so it is not strange and normal to rust.

Question three: why do bearings rust?

Bearing rust is related to the material and the use environment. Bearing steel itself contains carbon components, which will react when it encounters water vapor.If you don't want the bearing to rust, you should do a good job of anti-rust treatment.Or choose non-steel bearing.

Metal products are easy to rust after oxidation, and stainless steel bearings are no exception.There are many factors affecting its rust: such as the chemical composition and structure of the metal material itself;Surface finish (oxygen concentration difference battery corrosion);The composition and pH of the solution in contact with the metal surface;And its environment and many other factors, these are the direct factors that make bearings rust.

In addition, when we use bearings, do not contact objects directly with your hand, because when sweat and bearing contact, a layer of sweat film will be formed on the surface of the bearing, sweat film will cause electrochemical action on the bearing and corrode the bearing.Therefore, we should use special gloves or finger gloves and other special tools to take bearings, do not contact directly with the hand.

Question four: Will steel bearings of GCR15 bearings rust in the outdoor environment?

Will, and is the same as the general steel will rust very badly, the Cr content of this steel is too little, the value behind bearing steel is Cr content, the unit is 1/1000, the Cr content of GCr15 is only about 1.5%, if the Cr content can be close to the boundary of 13%, rust prevention effect is better,For example, CR12 (containing about 12% of CR12) class of steel is basically not how to rust.

Question five: Can bearing steel be rust-proof?

Although the content of Cr in bearing steel is relatively high, it has a certain antirust effect, but the content of Cr in steel is low, and the content of Cr in GCr15 is only about 1.5%. At this time, the Cr element plays a role in improving the mechanical properties of steel.As with other metals, rust can be caused by humidity.Therefore, it is very necessary to take anti-rust measures for bearings and their parts.

Question six: the method to prevent bearing rust?

1, surface cleaning method:

Cleaning must be based on the nature of the antirust surface and the conditions at that time, the appropriate method is selected.The commonly used solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method.When the surface is dry and cleaned, it can be dried with filtered dry compressed air, or dried with a dryer of 120~170℃, or dried with clean gauze.

2. Method of coating antirust oil

(1) immersion method: some small bearings are soaked in antirust grease and adhered to the surface of a layer of antirust grease.Oil film thickness can be achieved by controlling the temperature or viscosity of the antirust grease.

(2) brush coating method: for large bearings that are not suitable for soaking or spraying, it is necessary to pay attention not only to avoid accumulation but also to prevent leakage of coating when brushing.

(3) spray method: some large bearings can not be oiled by immersion method. Generally, about 0.7Mpa pressure of filtered compressed air is used for spraying in clean air places.Spray method is suitable for solvent diluent antirust oil or thin layer antirust oil, but must adopt perfect fire protection and labor protection measures.

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