Erosion of Metals

Erosion of Metals

 

the gradual, layer-by-layer destruction of the surface of metallic materials by mechanical action or electrical discharges (electroerosion). The erosion of metals occurs upon the frictional rubbing of surfaces, wear, and cavitation, as well as upon the action of strong gas or liquid currents upon a surface, especially at high temperatures.

Various parts of jet engines, nuclear reactors, and steam turbines and boilers are subjected to destruction by erosion. Increased resistance of parts against erosion can be achieved by improving process technology or unit design and by selecting more suitable material; heat treatment also increases resistance against erosion. Structural materials have been developed that provide durable operation of parts under erosive conditions, such as some niobium and molybdenum alloys.

Erosion processes are the basis for many types of metal treatment, such as sandblasting, shotblasting, ultrasonic treatment, and electroerosive machining (or electron discharge machining).

References in periodicals archive ?
The phenomena of electro erosion of metals and their alloys were well known in the electro technology industry, because switches, contactors, micro switches etc.
Arthur Brown, Hecla's chairman and chief executive officer, said, "The continued erosion of metals prices is the culprit in Hecla's operating losses for 1992.