China Ningbo Bearings Manufacturer

Why my NSK Ball bearings rust?

02.22.2012 in Blog by admin

NSK Bearings produces motor rust and the reasons are complex and may be imported bearings NSK rust handled properly, water may be caused by corrosion, and corrosion caused by the mist. Here I told you explain it in detail.
Most plants used electrical insulating paint out of the volatile acid components, there are four:
① unreacted low molecular weight acid composition of paint raw materials (anhydrous different neighborhood and terephthalic acid, anhydrous maleic acid, trans-maleic acid).
② paint curing the resulting acid composition (modified with phenolic paint, by formaldehyde, formic acid into the water).
③ thermal or oxidative decomposition of the lower fatty acids (formic acid, acetic acid).
④ paint curing water generated by the decomposition of acid components. Insulating paint composition is produced mainly formic acid, formic acid and the amount of corrosion occurred between the occurrence of a close relationship.
Adsorption of volatile grease paint out of the acid component, caused by grease deterioration, and this acidic ingredients also promote the hydrolysis of fats, resulting in increased concentration of acidic components, causing corrosion of NSK bearings.
Grease works, is the use of oil layer separated from the ball with the inside and outside the raceway, the use of oil viscosity, ball and roller attached to the surface, separating the ball with the inside and outside the raceway metal interface, reducing the metal surface wear and protects the metal from air and moisture corrosion, reduce vibration and noise, so that the smooth rotation of NSK bearings.
But grease deterioration, the viscosity will change, breaking through the oil film, grease and attached to the functional characteristics of the separation will disappear, so the consequences.
First, making insulating paint composition produced by direct oxidation of acidic metal surface, causing bearing corrosion.
Second, the resulting ball bearing raceway with internal and external direct touch, wear occurs when the rotation, causing the noise increases.

Tags: Ball Bearing