http://phi-gmbh.eu/wp-content/uploads/2013/10/Mapping-Motor-Oil-Additives-on-a-Cam-Shaft-Lobe.pdf
Quote:
Application Note1Mapping Motor Oil Additiveson a Cam Shaft Lobewith PHI Scanning XPS MicroprobesIntroductionThe wear resistance of internal combustion engine parts can be improved by using appropriate motor oil additives.Extreme pressure and temperature conditions exist in areas where moving parts are in contact. These conditions will cause the molecular structure of properly chosen additives to break down and result in theformation of wear resistant surface compounds (iron phosphates and sulfides are typical). The chemistryand spatial distribution of such surface compounds can be probed with x-ray photoelectron spectroscopy
Quote:
Fluorine was detected and was found to be concentrated in the wear track of the cam lobe. The F 1s binding energy indicated that the fluorine was in a metal fluoride state demonstrating a conversion from the original fluorocarbon form.
Have used them in the past (worked on a couple of oil burners), but not a big fan of halides running around in my engine.
Posted not because I'm saying that the reactions that were identified were beneficial...could simply be a form of corrosion, not AW layers.
Quote:
Application Note1Mapping Motor Oil Additiveson a Cam Shaft Lobewith PHI Scanning XPS MicroprobesIntroductionThe wear resistance of internal combustion engine parts can be improved by using appropriate motor oil additives.Extreme pressure and temperature conditions exist in areas where moving parts are in contact. These conditions will cause the molecular structure of properly chosen additives to break down and result in theformation of wear resistant surface compounds (iron phosphates and sulfides are typical). The chemistryand spatial distribution of such surface compounds can be probed with x-ray photoelectron spectroscopy
Quote:
Fluorine was detected and was found to be concentrated in the wear track of the cam lobe. The F 1s binding energy indicated that the fluorine was in a metal fluoride state demonstrating a conversion from the original fluorocarbon form.
Have used them in the past (worked on a couple of oil burners), but not a big fan of halides running around in my engine.
Posted not because I'm saying that the reactions that were identified were beneficial...could simply be a form of corrosion, not AW layers.