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Abstract
A four-ball wear machine was used to follow the performancel wear scar appearance of a commercial secondary ZDDP antiwear additive in basestock. At a spindle speed of 1200 rpm, a protective glassy layer formed on the wear scar within seconds that gave excellent wear protection. The layer thickened unevenly forming mounds typically 20 μm diameter by a 0.3 μm thick. The mounds tended to detach from the surfaces after wear times of greater than 6 hours causing abrasive damage. The wear rate, however, continued to decrease with time. The protective layer had a very low iron content and was probably formed from a precursor friction film that surrounded and covered scars. At a spindle speed of 1 rpm, the ZDDP was ineffective and wear rates were more rapid than in basestock alone. Such scars were only lightly filmed, no P or Zn, and were surrounded and covered by profuse amounts of a loose black material.
Presented at the 47th Annual Meeting in Philadelphia, Pennsylvania May 4–7, 1992
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Presented at the 47th Annual Meeting in Philadelphia, Pennsylvania May 4–7, 1992
