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Unrevealed synergistic effects of certain additive composition of lubricating oil cause the formation of black spots on guiding planes of cast iron. We performed an X-ray photoemission study comparing samples with black spots to samples without. Sputter depth profiles of the elements Fe, O, C, Si, Ca, Mn, S, P and N were recorded. While the shapes of the iron and oxygen spectra do not differ markedly,...
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