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TIMKEN bearing corrosion mainly consists of metal corrosion and human hand sweat, metal corrosion accounted for the vast majority, many are unable to avoid. And the hand sweat can also cause TIMKEN bearing corrosion, mainly is the sweat will produce sweat film on its surface, interactions can occur in electrochemical reaction due to corrosion, but can be avoided, such as taking professional fetching parts gloves and other tools.
Metal corrosion mainly:
The surface finish; chemical structure and composition of metal material; the solution composition and pH value of metal surface; the environment temperature and humidity around the medium.
Rust proofing method:
To keep the surface clean, and washing must use appropriate methods. General chemical cleaning, mechanical cleaning and solvent cleaning method. The surface after cleaning can be used for drying compressed air drying, can also use the dryer 120~170 ℃ drying, and then use a clean dry gauze.
(1) spraying method
Such as some large rust cannot take immersion oil, mainly is suitable for the thin film anti rust oil or solvent antirust oil, but should pay attention to labor and fire protection measures.
(2) brush coating method
The brush should not only avoid the accumulation, but also to prevent the drain coated. Generally applicable to not be combined soaking or spraying some special shape products or outdoor construction equipment.
(3) soaking method
The oil film thickness can be achieved by controlling the antirust grease temperature or viscosity. Some small items by soaking in anti rust oil, let the surface adhesion on a layer of anti rust oil.
Grease adsorption acidic components evaporate in paint, causing the deterioration of the lubricant, and the acidic component and promote the hydrolysis of oil and fat, which results in the concentration of acidic substances increases, cause TIMKEN bearing corrosion.
The working principle of lubricating grease, oil layer of the inner and outer raceway are separated by a steel ball, the viscosity characteristics of grease, attachment surface roll in the ball and, metal interface between steel ball and the inner and outer raceway, reduce wear of metal surface and protect the metal from air and water corrosion, reduce vibration and noise, rotation the TIMKEN bearing can smooth.
But the deterioration of the lubricant, viscosity will change, oil film breaking through, separating the function of grease and adhesion properties will disappear, the resulting consequences.
One is the direct oxidation of the metal surface acidic components produced by insulating paint, TIMKEN bearing corrosion.
The two is caused by the steel ball and the internal and external raceway directly touch, wear occurs when rotating, resulting in increased noise.