What Does Liquid Impingement Erosion Test Mean?
A liquid impingement erosion test is a technique for assessing the erosion resistance of certain materials. This is most beneficial to service environments wherein solid areas are subjected to repetitive impacts by jets or liquid drops.
This type of test has occasionally been used to evaluate objects that are exposed to liquid capable of producing cavitations. This test is not applicable or meant for predicting or testing material resistance against erosion brought by impingement corrosion or particle impingement in bouncy flows. Instead it is intended for testing resistance to liquid jets with high velocity, slurries and liquids at the surface.
Corrosionpedia Explains Liquid Impingement Erosion Test
Generally, fluid machineries such as hydroturbines are prone to slurry erosion and cavitation, leading to destruction of nozzles, vanes, impellers, buckets, seals and other parts. Although hydroturbines that are made from 13Cr4Ni steel possess ample resistance against forming pits, they can degrade heavily when exposed to slurry erosion. Although spray coatings serve as a protection from slurry erosion, its effectiveness is not satisfactory. With this, a liquid impingement erosion test can be a great technique to assess how a certain material will respond to slurry erosion.
Cavitation erosion and liquid impingement erosion are generally the same process, as the comparative material resistance to these is alike. In both cases, the damage is brought about by small-scale, repeated and intense pressure pulses on the surface. Failure mechanisms in solid surfaces vary on other types of materials, more particularly in terms of solid-fluid interaction, detailed nature as well as scale.