Reasons for discoloration of cylinder piston rod

Each movement of the front-end attachment of the excavator is realized through the oil cylinder. During frequent reciprocating movements, the oil cylinder is easily affected by oil quality and external factors, and may cause discoloration of the surface of individual piston rods. Why is the piston rod colored?
Since hydraulic oil contains additives with complex composition, under the action of specific temperature and high pressure of hydraulic oil, the additives will crystallize and adhere to the surface of the piston rod. Under the action of the shear force of the hydraulic cylinder oil seal, the piston rod will become discolored. Phenomenon.
Try not to mix hydraulic oils of different brands, otherwise the quality of the oil will be reduced, and in severe cases, the oil will deteriorate. Hydraulic oil contains a variety of additives with special effects. When oils containing additives from different systems are mixed, it will affect the performance of the insulating material and even cause the additives to precipitate and deteriorate. In this case, it is also easy to cause discoloration of the piston rod.