1.1 本试验方法包括通过FT-IR（傅里叶变换红外光谱）测定使用过的润滑剂的氧化。它测量润滑油氧化过程中形成的含有羰基功能的成分的浓度变化。 1.2 该试验方法可用于指示油在氧化条件下发生的相对变化。该测试方法不旨在测量可用于预测使用中的油的性能的绝对氧化性能。 1.3 该测试方法是针对在使用中或实验室测试（例如整体氧化测试）中降解的变速器油而开发的。 它可用于其他在用机油，但规定的精度可能不适用。 1.4 此测试方法的结果可能会受到吸收带在1600 cm区域内的其他组分的影响 -1 至1800厘米 -1 在这些情况下，低PAI值可能难以确定。部分 6. 更详细地描述了这些可能的干扰。 1.5 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 PAI代表润滑油氧化形成的所有含羰基功能的化合物（醛、酮、羧酸、酯、酸酐等）的数量。 ). PAI提供了由氧化引起的润滑剂化学降解的代表性信息。 5.2 本试验方法是针对变速器油开发的，并用于CEC L-48-A-00试验（通过人工老化的汽车变速器用润滑油的氧化稳定性），作为试验结束评估的参数。

1.1 This test method covers the determination of the oxidation of used lubricants by FT-IR (Fourier Transform Infrared Spectroscopy). It measures the concentration change of constituents containing a carbonyl function that have formed during the oxidation of the lubricant. 1.2 This test method may be used to indicate relative changes that occur in an oil under oxidizing conditions. The test method is not intended to measure an absolute oxidation property that can be used to predict performance of an oil in service. 1.3 This test method was developed for transmission oils which have been degraded either in service, or in a laboratory test, for example a bulk oxidation test. It may be used for other in-service oils, but the stated precision may not apply. 1.4 The results of this test method may be affected by the presence of other components with an absorbance band in the zone of 1600 cm -1 to 1800 cm -1 . Low PAI values may be difficult to determine in those cases. Section 6 describes these possible interferences in more detail. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The PAI is representative of the quantity of all the compounds containing a carbonyl function that have formed by the oxidation of the lubricant (aldehydes, ketones, carboxylic acids, esters, anhydrides, etc.). The PAI gives representative information on the chemical degradation of the lubricant which has been caused by oxidation. 5.2 This test method was developed for transmission oils and is used in the CEC L-48-A-00 test (Oxidation Stability of Lubricating Oils Used in Automotive Transmissions by Artificial Aging) as a parameter for the end of test evaluation.