NB/SH/T 6049-2022 in English

The industry standard NB/SH/T 6049-2022, titled "Determination of Oxidation Stability of Automatic Transmission Fluids - Artificial Aging Method," was issued on May 13, 2022, and came into effect on November 13, 2022. This standard specifies the method for evaluating the oxidation stability of automatic transmission fluids (ATFs) through an artificial aging process. The procedure involves subjecting the ATF to elevated temperatures in the presence of air or oxygen to simulate long-term aging conditions that the fluid might experience during actual service.

The test method outlined in this standard is crucial for assessing the ability of ATFs to resist oxidation, which is a key factor in maintaining the performance and longevity of automatic transmission systems. Oxidation can lead to the formation of sludge, varnish, and acidic compounds, which can impair the operation of the transmission and lead to premature failure. By using the artificial aging method, manufacturers and users can predict the service life of ATFs under harsh operating conditions and ensure that the fluids meet the required performance standards.

The standard provides detailed instructions on the equipment, reagents, and procedures required to conduct the test, as well as the criteria for evaluating the results. It is applicable to a wide range of automatic transmission fluids used in various types of vehicles and machinery. Compliance with this standard helps to ensure the reliability and safety of automatic transmission systems by verifying the oxidative stability of the fluids used.