BLACKENING OF COPPER ALLOY BEARING CAUSED BY LUBRICATING OIL FOR AUTOMOBILE ENGINE

摘要

1) The blackening phenomenon noted with the corrosion represents an early step of a series of progress and is followed in later stage by the deposition. In addition, the growth of blackening phenomenon can be estimated qualitatively using blackening index=Pb+ (Pb/Cu)~2. 2) Although the correlation between oil formulation and the growth of blackening phenomenon cannot be found, the blackening phenomenon can be minimized potentially by optimization of oil formulation.