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Journal for dingxinda9Journal for dingxinda9
Feb
24
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Causes of pitting corrosion in fatigue wear of wear-resistant materials
The use of white corundum, green silicon carbide powder and other wear-resistant materials for surface coating can reduce the wear on the machine or parts and extend the service life. abrasives china manufacturers Fatigue wear will occur during the use of the machine and parts. Here is the introduction of fatigue wear One of the formation of pitting corrosion is caused by surface fatigue crack propagation.

This mechanism was first proposed by Wei. He believes that the starting position of pitting fatigue cracks first appears on the contact surface. The high-pressure oil wave generated by the lubricating oil due to the contact pressure quickly enters the surface cracks and produces a strong impact on the crack wall. The liquid shock.
At the same time, the upper contact surface blocked the crack opening, so that the oil pressure in the crack was further increased, so the crack expanded in depth. silicon carbide manufacturers usa The small piece of metal between the crack and the surface is bent like a cantilever beam. When the root strength is insufficient, it will break and form small pits on the surface, which is "pitting". Its conclusions are as follows:

1) The necessary condition for pitting corrosion is to use lubricating oil.

2) If the viscosity of the lubricating oil is higher than a certain value, pitting corrosion will not occur because the oil is not easy to enter the cracks.

3) Very smooth contact surface, not prone to pitting corrosion

4)The state of heat treatment has a significant effect on pitting corrosion.
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