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 increases greatly. This value is called the critical relative humidity, and the critical relative humidity of steel is about 70%.
2. effect of temperature
The ambient temperature is associated with relative humidity. Under the dry environment (desert), the temperature and the high metal are not easy to rust. When the relative humidity reaches the critical value, the effect of temperature increases obviously, and the corrosion rate increases by two times when the temperature increases at 10 degrees C. Therefore, in the wet or rainy season, the higher the temperature, the more serious the corrosion.
The effect of 3. oxygen
The following reaction is used to indicate the process of rust:
Fe+H2O - Fe (OH) 2
Fe (OH) 2+ H2O+O2 - Fe (OH) 3
Fe+ H2O+O2 - Fe (OH) 3
It can be seen that without water and oxygen, the metal will not rust, the 20% volume of air in the air is oxygen, it is all pervasive.
4. influence of other substances in the atmosphere
Atmospheric salt fog, sulfur dioxide, hydrogen sulfide and dust will accelerate corrosion. Therefore, the size of corrosion is obviously different under different environments. The urban area is higher than the rural area, the industrial area is higher than the living area, the coastal area is higher than the inland area, and the high dust is higher than the low dust.
(three) corrosion factors in the process of processing
The raw material is corroded, after processing failed to complete the removal; processing with cutting fluids, lubricants and other materials; after pickling and washing; heat treatment or residual salt oxidation and decarburization cleaning; inspection, handling and assembly when the operator left hand sweat; to stress or to hydrogen annealing process and improper; not suitable for storage antirust etc.
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Brand: AUTO
Series: deep groove ball bearings, single row, no seals
Shape size
d: 100
D: 125
B: 13
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