Assessment of Ultrasonic Cavitation Corrosion Bench Tests
Several ultrasonic bench rigs are widely used in the engine coolant industry for cavitation corrosion tests. These tests are focused on the qualification of coolants formulated to minimize cavitation corrosion. Standardized metal test “buttons” of different materials are used for that purpose. Traditionally these cavitation corrosions tests are run for a specified period of time. At the end of the test the amount of mass removed from coupons due to cavitation is a direct reflection of the cavitation corrosion performance of the additive. However, results can show wide scatter and inconsistencies depending on the ultrasonic probe manufacturer, testing lab, horn type, dial setting level and probe instability. Therefore, a way of quantifying the cavitation intensity of these various designs was clearly called for to establish a standardized test and recommendation to be utilized across the coolant testing community.