抄録
Evaluation of sand erosion-corrosion resistance of metallic materials was required for selecting an appropriate material to construct a pump to be used for raising particles carried in a strongly corrosive liquid. Three types of testing facilities were adopted: Stauffer's Grinding Pot Device, a magnetostriction vibratory cavitation eorsion testing facility and the newly developed magnetostriction vibratory sand erosion testing facility. The Stauffer's Device produced an unexpected result: the weight loss of test specimen under erosion-corrosion conditions was smaller than that under pure erosion conditions. The root cause is that the eroded and corroded areas on the specimen surface are not equal: the front side surface is eroded as well as corroded by the slurry stream, while the rear side surface is only corroded. We have to conclude that the Device is not suitable for an erosion-corrosion testing method. No such inexpedience was occurred in the results obtained by the magnetostriction vibratory facilities where the eroded and corroded areas on the specimen surface are completely coincide. The mechanical properties of the test specimen, however, produced a larger influence on the results obtained by the vibratory cavitation test in compared with that on the results obtained by the vibratory sand-erosion test. Thus, it was concluded that a cavitation erosion-corrosion test can not be substituted for a sand erosion-corrosion test.
