Tribodiagnostics of the initial stage of wear of detergent additives in in motor oil

Engine oil requires frequent replacement, so it is necessary to diagnose the mechanochemical process of wear (processing) of detergent additives. The paper presents the results of a study of the wear process of detergent additives and the natural aging of M-6z/12G1 engine oil after friction treatment and the appearance of wear particles at the initial stage of engine operation. Metallography and nuclear magnetic resonance methods were used in the tests. It was found that the relaxation time of protons of the engine oil under study decreases with an increase in the number of ferromagnetic particles in its colloidal solution, which are wear products. At the same time, as the number of wear particles in the oil increases, the size of the molecular complexes of detergent additives increases due to their coagulation (achieving a minimum energy state). The complexes envelop the wear particles and keep them suspended in a colloidal solution. It is shown that after mechanical friction for 0.5 and 3.0 h and an increase in the number of wear particles, 10-day exposure (with the engine not running) and subsequent shaking, the spin-spin relaxation time of the oil does not increase, but, on the contrary, is significantly reduced (by 1.6 and 2.8 times, respectively) due to oxidative processes occurring during the interaction with oxygen in the air (natural aging). After natural aging, oil that does not contain wear products loses its performance properties 2 – 3 times slower than its spent and aged counterparts. The results obtained can be used for tribodiagnostics of the initial wear stage of detergent additives in engine oil.

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