Erosion

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SOLID IMPINGEMENT
Solid Particle Impingement is a form of erosion produced by a continuing succession of impacts from solid particles on a surface. The impacting particles are smaller than the solid subjected to the erosion, and if all the impacts are superimposed on the same spot, the term repeated impact is used.

 

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FLUID IMPINGEMENT
Impingement simply means the act of hitting or striking. Fluid impingement is a progressive material removal from a solid surface by the striking action of a fluid on a solid surface. The impinging fluid does not contain particles as would be the case in slurry erosion.

 

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CAVITATION
Cavitation erosion is a progressive loss of material from a solid due to the action of bubbles in a liquid collapsing near the solid surface. When bubbles collapse in a liquid, surrounding a bubble rushes in to fill the void. This action can create tiny liquid jets that can cause material removal.

 

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SLURRY
Slurry erosion is a progressive loss of material from a solid surface by the action of a mixture of solid particles in a liquid, (slurry), in motion with respect to the solid surface. If the solid surface is capable of corroding in the fluid portion of the slurry, the slurry erosion will contain corrosive component.

 

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FRETTING
Fretting is defined as oscillatory movement of small amplitude between two solid surface. It is usually tangential in nature, and typically it is unintended motion. It most often occurs between parts that are not supposed to experience relative motion.

 

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ADHESIVE
Seizure is the stopping of relative motion as the result of inter-facial friction. Local solid-state welding may be a part of the mechanism of seizure. This wear process does not necessarily require progressive loss of material.

 

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SEIZURE
Seizure is the stopping of relative motion as the result of inter-facial friction. Local solid-state welding may be a part of the mechanism of seizure. This wear process does not necessarily require progressive loss of material.

 

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GALLING
The term galling does not have an agreed on definition. In Europe, the wear community, used the term scuffing in it place. The organization for Economic Co-Operation and Development, Paris (OECD), defines scuffing as localized damage caused by the occurrence of solids-phase welding between sliding surfaces, without local melting.

 

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OXIDATIVE WEAR
Oxidative wear is a wear process in which sliding surface react with their environment to form oxide films that separate the surfaces and keep the wear exists in lightly loaded systems, and it is sometimes referred to as mild wear.