“Jet-in-slit” was used for erosion-corrosion tests on 6/4 yellow brass in a 3% sodium chloride solution together with free jet and submerged jet (common nozzle diameter of 1.6 mm). The latter jets are typical testing methods for evaluating the resistance of alloys to erosion-corrosion. Each specimen sustained a characteristic damage on its surface after 24-h running under common flow rate (0.4 L/min) of the test liquid. The most critical damage occurred on the jet-in-slit specimen. Measurements through hydrodynamic as well as electrochemical techniques have proved that on a free jet specimen, the damage occurs only on the place of maximum shear stress, and on the submerged jet and jet-in-slit specimens occurs not only at the place of maximum shear stress but also at a place downstream where the flow velocity is considerably low but where impulsive pressure occurs intermittently. Based upon the experimental results obtained, the authors recommended the jet-in-slit for a standard testing method of erosion-corrosion resistance.

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