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Deterioration causes and test methods of gear oil


The internal reason for the deterioration of gear oil is that the stability of the base oil has a certain limit, and it will deteriorate with the passage of storage and use time; various additives added to improve the overall performance of the oil are gradually consumed and deteriorated during use. Generally, this metamorphosis is very slow, often taking 2 years or longer. The external cause is the deterioration of oil caused by the mixing of moisture, dust, metal powder and other pollutants during storage, transportation and use.

Gear oils are used to lubricate spur, helical, herringbone, bevel gears and worm gears. Divided into the following categories: ①Closed gear oil. Ordinary gear oils are used for gear lubrication with light loads; extreme pressure gear oils contain more extreme pressure anti-wear agents and are used for gear lubrication with medium, heavy loads or impact loads. They are mostly used in the metallurgical industry and generally use American gear oils. Manufacturers Association and U.S. Steel Specifications. ②Open gear oil. High viscosity, strong adhesion. It is prepared with heavy lubricating oil plus asphalt or polymer adhesive, and diluent can be added for convenience. ③Worm gear oil. It is made by adding refined petroleum lubricating oil or synthetic oil to an appropriate amount of fat or oily agent.

Gear oil deterioration phenomenon:

①. The appearance changes, the color becomes darker and mixed, emulsification occurs, and there are obvious abrasive particles, mechanical impurities and sludge.

Ps-Zj002 Determination Of Oil Sludge Petroleum Products Mechanical Impurity TesterThe sludge precipitation tester can accurately determine the stability and anti-sedimentation ability of lubricating oil at high temperature.

② Viscosity change The viscosity of the oil containing the viscosity index improver decreases due to mechanical shear, while the viscosity of the oil increases due to oxidation and emulsified sludge.

PS-YN1301 Kinematic Viscosity TesterThe test results of the kinematic viscosity tester are very important for the performance and quality control of the liquid.
③ Changes in acid value In oil products containing high acid value additives, the decrease in acid value at the beginning of use indicates the consumption of additives, and the increase in acid value in the later period is the result of acid products produced by oxidation.

PUSH Electrical Automatic Insulation Three Cup Oleic Acid TesterThe use of oil acid number testers helps manufacturers monitor the quality of lubricating oils and other fluids to ensure that products meet standards and specifications, thereby improving product performance and reliability.
④. The anti-emulsification performance becomes worse with the increase of water content. Hydrolysis of extreme pressure agents affects lubrication and pitting and gluing of tooth surfaces may occur.

The use of the anti-emulsification tester can help manufacturers select lubricating oil with good anti-emulsification performance, ensure the reliable operation of the equipment in a humid environment, and improve the life and performance of the equipment.
⑤. The increase of benzene and pentane (petroleum ether) insoluble matter is the result of the pollution of oil products such as oxidation products, metal shavings and dust at high temperature during long-term use.