The reasons for the rusting of motor bearings are very complicated. It may be that the imported bearings are not properly treated for rust prevention, or they may be rust caused by water, and rust caused by paint mist. There are mainly four kinds of acid components volatilized from the insulating varnishes used by most electrical machinery factories: ① unreacted low-molecular-weight lacquer raw materials acid components (anhydrous isophthalic acid and terephthalic acid, anhydrous maleic acid, trans butenedioic acid). ②The acid component generated when the lacquer is cured (when using phenolic denatured lacquer, it changes from formalin to formic acid). ③ Lower fatty acids (formic acid, acetic acid) generated by thermal or oxidative decomposition. ④The acid component generated by the water decomposition of the lacquer cured product. The main acid component produced by insulating paint is formic acid, and the amount of formic acid generated is closely related to the degree of corrosion. The grease absorbs the acid components volatilized from the paint, causing the grease to deteriorate, and this acid component promotes the hydrolysis of the grease, resulting in an increase in the concentration of the acid component, causing bearing corrosion. The working principle of lubricating grease is to use the grease layer to separate the steel ball from the inner and outer raceways, and use the viscosity characteristics of the grease to attach to the surface of the steel ball and the raceway to separate the metal interface between the steel ball and the inner and outer raceways, reducing the metal surface. Wear and protect metal from air and water corrosion, reduce vibration and noise, and enable NSK bearings to rotate smoothly. However, after the grease is deteriorated, the viscosity will change, the oil film will be broken, and the separation function and adhesion characteristics of the grease will disappear. The consequence of this is that the acid component produced by the insulating paint directly oxidizes the metal surface, causing bearing corrosion. The second is the direct contact between the steel ball and the inner and outer raceways, and wear occurs when rotating, resulting in increased noise. The content of this article is uploaded and contributed by Internet users. This website does not own the ownership, has not been edited manually, and does not assume relevant legal responsibilities. If you find any content suspected of plagiarism in this community, please send an email to:1850385365@qq.com Report and provide relevant evidence, and the staff will contact you within 5 working days. Once verified, this site will immediately delete the allegedly infringing content.
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