Effect of Additives on Abnormal Wear Caused by Synergistic Effects of Corrosion and Cavitation in High-Speed Flow of Glycol-based hydraulic fluid Valve Surfaces

Abstract

In an environment where glycol-based hydraulic fluid flows at high speed through a hydraulic circuit, the seat of a linear solenoid valve wears due to the synergistic effects of cavitation erosion and corrosion of the metal surface caused by the hydraulic fluid. The wear of the seat of a linear solenoid valve causes leakage of hydraulic fluid in the circuit, so there is a need to elucidate the wear factors and to reduce the wear. Focusing on the additives in the hydraulic fluid, tests were conducted in which hydraulic fluid containing different additives flowed in a hydraulic circuit. As a result, it became clear that different additives contained in the hydraulic fluid affected the amount of wear on the surface of the seat after the test. It was also found that the benzothiazole-based copper corrosion inhibitor promoted wear, but when used in combination with a different type of copper corrosion inhibitor, wear was suppressed.