2023-11-28
What Are The Reasons For The Discoloration Of Construction Machinery Hydraulic Cylinders
a. High temperature phenomenon in the hydraulic system: If the hydraulic system experiences high temperatures while the piston rod frequently comes into contact with low temperatures (such as sudden drops in temperature), it can cause thermal expansion and contraction. This temperature differential can lead to stress on the piston rod, potentially affecting its performance and integrity. It is important to ensure proper insulation or heat dissipation measures are in place to minimize the impact of temperature fluctuations on the hydraulic system.
b. Discoloration of the piston rod after oil change: When replacing the hydraulic oil with a different brand or type during maintenance, the discoloration of the piston rod within a few days can be attributed to the presence of extreme pressure anti-wear additives in the new hydraulic oil. Different brands or formulations of hydraulic oil may contain varying additives, which can react differently with the surface of the piston rod, leading to discoloration. Proper selection and compatibility testing of hydraulic oils are essential to avoid such issues.
c. Cracks on the surface of the electroplating layer: If cracks appear on the surface of the electroplating layer of the piston rod after the electroplating process, it may indicate uneven temperature control during the plating process. Rapid or uneven heating or cooling can lead to thermal stress, causing cracks in the electroplating layer. These cracks can be observed with a high-magnification magnifying glass. It is important to ensure proper temperature control and plating process parameters to prevent such issues.
d. Blue color and blackening on the piston rod: The blue color on the cylinder rod can be caused by the additive in the oil seal and hydraulic oil adhering to the rod at high temperatures. This can occur due to chemical reactions or deposits on the surface. The blackening can be attributed to the lead-containing additive in the spray applied to the wear-resistant sleeve (spray cup) attached to the cylinder rod at high temperatures. These color changes are indicative of chemical interactions and should be monitored to ensure they do not affect the performance or integrity of the hydraulic system.
It is important to address these issues promptly to prevent further damage or performance degradation of the hydraulic system. Regular maintenance, proper selection of hydraulic oils, and adherence to recommended process parameters can help mitigate these problems.