The lubrication mechanism of aluminium alloy slid against steel was investigated from the standpoint of surface chemistry. Low\r\nfriction and low wear were observed using glycerol mono-olate in a hydrocarbon as lubricant. Increase in the silicon content\r\nin the aluminium alloy during rubbing was observed by surface analyses using (1) Auger electron spectroscopy, (2) scanning\r\nelectron microscopy along with energy dispersive X-ray spectroscopy, and (3) X-ray photoelectron spectroscopy. Mild removal of\r\nthe passive state (aluminium oxide) from the uppermost surface by the additive during the running-in process was proposed as\r\nthe lubrication mechanism. The importance of additive chemistry that improves the running-in process was pointed out.
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