Radiospectroscopic Study of Used Marine Oils

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL
N. Ya. Sinyavsky, I. G. Mershiev
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Abstract

This work investigated the hydrocarbon degradation and depletion of the anti-wear additive zinc dialkyldithiophosphate (ZDDP) in several used marine motor oils using high-resolution nuclear magnetic resonance (NMR). The article presents research results showing that during engine operation several characteristics of motor oil change: degree of aromaticity, ratio of methyl/methylene groups, and composition of phosphorus-containing additives. The possibility of determining oil using the NMR spectrum lines of antiwear additives has been demonstrated. For anti-wear additives containing phosphorus, such as ZDDP and molybdenum dialkyldithiophosphate (MoDDP), 31P NMR has been found to provide both depletion rates and insight into the wear mechanism of the additives. The high efficiency of using the high-field NMR spectroscopy method for studying fresh and used marine motor oils has been demonstrated. 1H, 13C, and 31P NMR studies show the presence of changes in motor oil caused by the accumulation of products of its decomposition, degradation, and decomposition of additives during engine operation. The ability of the NMR radiospectroscopy method to monitor additive depletion is analyzed, which is apparently one of the most difficult problems in used oil analysis. A characteristic feature of the NMR spectra of all used oils is line broadening caused by the presence of metal wear particles. It is characteristic that the broadening of the 13C NMR lines for waste oils is significantly less than the broadening in the NMR spectra of protons. In the 13C NMR spectrum of used oil, an increase in the intensity of the line from aromatic hydrocarbons is observed, i.e., as the degree of oil degradation increases, the content of aromatic compounds increases. The results of the study of fresh and used motor oils obtained in this work are new. They can be used to create a system for monitoring the quality of motor oils and for diagnosing engine malfunctions using used oil.

Abstract Image

Abstract Image

废海洋油的辐射光谱研究
摘要--这项研究利用高分辨率核磁共振 (NMR) 对几种使用过的船用机油中抗磨添加剂二烷基二硫代磷酸锌 (ZDDP) 的碳氢化合物降解和损耗情况进行了调查。文章介绍的研究结果表明,在发动机运行过程中,机油的几个特性会发生变化:芳香度、甲基/亚甲基的比例以及含磷添加剂的成分。利用抗磨损添加剂的核磁共振谱线确定机油的可能性已经得到证实。对于含磷的抗磨损添加剂,如 ZDDP 和二烷基二硫代磷酸钼(MoDDP),31P NMR 既能提供损耗率,又能深入了解添加剂的磨损机理。使用高场核磁共振光谱方法研究新鲜和使用过的船用机油的高效性已得到证实。1H、13C 和 31P NMR 研究表明,机油中存在由其分解产物的积累、降解和发动机运行期间添加剂的分解引起的变化。分析了核磁共振辐射光谱法监测添加剂损耗的能力,这显然是废油分析中最难解决的问题之一。所有废油核磁共振光谱的一个特点是,由于存在金属磨损颗粒,光谱线会变宽。废油 13C NMR 线宽的特征是明显小于质子 NMR 光谱中的线宽。在废油的 13C NMR 光谱中,可以观察到来自芳香烃的谱线强度增加,即随着油品降解程度的增加,芳香族化合物的含量也会增加。这项工作对新机油和废机油的研究结果是全新的。这些结果可用来创建一个系统,用于监测机油质量和诊断使用过的机油造成的发动机故障。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
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