The reason for the rust of the motor NSK bearing is very complicated. It may be that the NSK imported bearing has poor rust treatment, it may also be caused by moisture and rust caused by paint mist. Let me explain it in detail below.
There are four main types of acid components evaporating from insulating paints used in most motor plants:
1 low-molecular lacquer raw material acid component (anhydrous iso- and terephthalic acid, anhydrous maleic acid, trans-butenedioic acid) which does not react.
2 The acid component formed during curing of the paint (from formaldehyde to carboxylic acid, from formaldehyde to formic acid).
3 Lower fatty acids (formic acid, acetic acid) produced by thermal or oxidative decomposition.
4 The acid component of the cured product after water decomposition. The main acid component produced by the insulating varnish is formic acid, and the amount of formic acid generated is closely related to the degree of rust occurrence.
The grease adsorbs the acidic components volatilized in the paint, causing the grease to deteriorate, and this acidic component promotes the hydrolysis of the oil, resulting in an increase in the concentration of the acidic component, causing corrosion of the NSK bearing.
The working principle of the grease is to separate the steel ball from the inner and outer races by using the grease layer. The viscosity characteristics of the grease are attached to the steel ball and the raceway surface, separating the metal interface between the steel ball and the inner and outer raceways, and reducing the metal surface. Wear and protect metal from air and moisture, reduce vibration and noise, and make NSK bearings rotate smoothly.
However, after the grease has deteriorated, the viscosity will change, the oil film will break through, and the separation function and adhesion characteristics of the grease will disappear, thus the consequences.
First, the acidic components produced by the insulating varnish directly oxidize the metal surface, causing the bearing to rust.
The second is that the steel ball is in direct contact with the inner and outer raceways, and wear occurs when rotating, thereby causing noise increase.
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Tags: NSK bearing grease acid component raceway
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