Ricardo Duque - ToF-SIMS Analysis of Anti-Fretting Films Generated on the Surface of Ball Bearings Containing Organo-Molybdenum and Zinc Grease Additives.

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      Publication Details (including relevant citation   information):

    Applied Surface Science 231-232:342-347; 2004.

      Abstract:

        During transport of hard drives from the factory to the end   customer, vibrations can induce small repetitive displacements of   the ball bearings giving rise to fretting corrosion at the metal   surfaces. On the other hand, it has been found that some   particular types of grease additives can form thin layers on   steel surfaces and thus protect against fretting corrosion.   ToF-SIMS has been used to study the chemical nature of layers   formed on bearing surfaces containing greases with   dithiocarbamates, dithiophosphates, and metal sulfonate   additives. In cases where fretting was prevented, the presence of   MoS2,   FeS and   ion fragments containing Mo–Fe–S were   observed, whereas none of these ions were detected on the   surfaces of fretted bearings. Finally, it is inferred that the   action of metal sulfonates may have an antagonist effect on the   anti-fretting activity of the dithiocarbamate and dithiophosphate   compounds studied.

      Address (URL): http://www.sciencedirect.com/science/article/pii/S0169433204003265