Abnormal wear of valve seat due to synergistic effects of corrosion and cavitation in high-speed flow environments of glycol-based hydraulic fluids

Abstract

When hydraulic fluid flows through a valve made of SUJ2 at high speed, the valve sometimes wear abnormally.

Since valves with abnormal wear lose their functions, it is necessary to elucidate the causes of abnormal wear. The purpose of this study was to clarify the effects of corrosivity and cavitation of the hydraulic fluid on abnormal wear.

Wear groove volume measurements, detailed surface observations, and surface component analysis were conducted at the abnormal wear locations. The results suggest that the area near the chrome carbide is eroded by corrosion and cavitation, and pits are generated in the abnormal wear area. It was also suggested that the brittle fracture near the edge of the pit was caused by cavitation, resulting in the expansion of the fracture surface and abnormal wear.