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The phenomenon of loss of metal in the relative movement of parts is known as the wear of parts. The occurrence of wear will cause changes in the shape, size and surface properties of the parts, which will gradually reduce the working performance of the parts. Wear is sometimes beneficial, such as running-in. According to different friction principles, wear can be divided into abrasive wear, adhesive wear, fatigue wear and corrosion wear.

Corrosion wear:

The abrasion on the friction surface of parts caused by chemical or electrochemical reaction due to the action of external medium is called corrosive wear. Corrosion wear is divided into oxidation corrosion wear, chemical corrosion wear and fretting wear.

Chemical corrosion wear:

The abrasion caused by chemical reaction directly between the metal and the external medium is called chemical corrosive wear. When a part is working in corrosive gas or liquid environment, a chemical reaction film is formed on the surface of the component. The bonding strength between the reaction film and the base metal is usually low. When the parts move relative to each other, the chemical reaction film will fall off and cause the chemical corrosion and wear of the parts.

Electrochemical corrosion wear:

The abrasion caused by the electrochemical reaction of metal in the external medium is called electrochemical corrosion wear.

Fretting wear:

Fretting wear is called fretting wear, which is caused by alternating load or vibration on the surface of interference fit of parts.

Cavitation:

Cavitation erosion is a fatigue exfoliation phenomenon on the surface of a solid moving relative to a liquid due to the local high temperature caused by bubble rupture and high impact pressure.

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