618 series deep groove ball bearing 

Main factors affecting metal corrosion (1) internal factors of metal corrosion From a thermodynamic point of view, metals and their corrosion products have higher energy and are unstable, and have the tendency of spontaneous transformation to low energy corrosion products, that is, metal corrosion is a natural phenomenon. Most of the industrial metal is a multicomponent alloy, microstructure, impurities, machining deformation is not uniform, uniform stress distribution, uniformity of these physical, chemical and electrochemical corrosion, when encountered surface or water film formed on the surface, will inevitably occur in chemistry or electrochemical corrosion. (two) external factors of metal corrosion 1. shadow of relative temperature The higher the relative humidity in the air, the thicker the water film on the surface of the metal, and the oxygen in the air acts through the water film to the metal surface. When the relative humidity reaches a certain value, the corrosion rate…

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