Metallic Corrosion - Corrosion and Erosion

Background

The combined effects of corrosion and erosive damage will arise when fluid velocity is high and when mechanical wear takes place due to abrasion by suspended solid particles.

 

Protective surface films are more readily damaged and their repair by passivating effects is prevented. This leads to increased rates of local corrosion, called impingement attack, at areas of turbulence. The effect can be reduced by design to lower flow rates and to void sudden changes in flow direction.

 

Cavitation attack can occur in pump impellers and propellers when the collapse of bubbles formed in the surrounding liquid can cause severe local damage at their surfaces. Vibration and other relative movement under load between surfaces can also continually damage the oxide layers resulting in fretting corrosion, this can initiate pitting and nucleate fatigue cracks.

 

Primary author: J. Pearce

Abstracted from Materials information Service, “Metallic Corrosion” edited by Dominic Lodge

 

For further details on the Materials Information Service or this publication visit The Institute of Materials

 

Date Added: Feb 21, 2001 | Updated: Jun 11, 2013
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