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A quantitative evaluation of inorganic boundary films formed in engine oils by TOF‐SIMS depth profiling with low energy Cs sputtering
Author(s) -
Murase Atsushi,
Kato Yuichi,
Sudo Eiichi
Publication year - 2019
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6596
Subject(s) - sputtering , analytical chemistry (journal) , chemistry , secondary ion mass spectrometry , pellets , calcium , calcium carbonate , mass spectrometry , mineralogy , materials science , thin film , chromatography , composite material , nanotechnology , organic chemistry
Quantitative evaluation of lubrication boundary films was investigated by time‐of‐flight secondary ion mass spectrometry depth profiling with low energy Cs sputtering. Relative sensitivity correction coefficient (RSC) for calcium phosphate, calcium carbonate, or calcium sulfate was determined by measuring the pellets of the mixture of these compounds. The RSCs for the three calcium salts varied with measurement conditions such as sputter energy and primary ion species. By using the RSC determined in this investigation, the depth profiles of the boundary films formed in real engine oil were corrected to quantitative profiles. The difference of structures between two lubrication boundary films on the different substrate materials formed in the same engine oil was clarified.