Produce NSK bearing the cause of rust motor is very complex, may be bearing antirust processing is bad, can also be caused by water corrosion and corrosion caused by the mist.

Most of the electric insulation varnish volatile acid out there are four main:

(1) did not happen reaction low molecular paint raw material acid (no water, no vision and adjacent terephthalic acid water a green pigment, c33h34n4o6, trans world two acid).

(2) the paint curing generated acid (phenolic degeneration paint, the formaldehyde water into formic acid)

(3) oxidative decomposition of the generation of heat or low-level fatty acids (formic acid, acetic acid).

(4) the paint cured products after split water of the generation of acid. The main acid produced insulation is formic acid, formic acid and corrosion occurrence degree of the tesult between have close relationship. Grease the adsorption of volatile paint the acid composition out, cause a grease metamorphism, and the acid composition and promote the hydrolysis of grease and as a result, the concentration of the acid components increase, cause NSK bearing rust.

 
The working principle of grease, is to use oil layer will roll separate internal and external steel ball and, using oil viscosity properties, attachment in the steel ball and groove surface, the space with the ball inside and outside groove metal interface, reduce the wear and tear of the metal surface and the protection of the metal from the air and water corrosion, reducing vibration and noise, make the bearing can smooth rotation. But after grease metamorphism, viscosity will change, oil film broken wear, the space of the function and adhesion grease characteristics will disappear, such consequences, is to make the insulation a produces acidic composition directly oxidized metal surface, cause bearing rust.It is cause steel ball and internal and external groove straight contact touch, occurs when revolving wear and thus cause increase noise.
 



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