Anodic oxidation films (AOF) are prepared by a chromic acid process on a rolled surface (AOF-r) and a polished surface (AOF-p) of an Al-Li alloy. Surface topographies are featured as valleys and plateaus with dimples on AOF-r while plain with dimples and scratch marks on AOF-p. In flooded ionic liquid, AOF-r has better tribological property than AOF-p under heavy loads, which is determined by the bearing characteristic (Rpk, Rk, Rvk, and MR1). In addition, dimple on plateau of AOF-r is effective surface texture for increasing load-carrying capacity. In starved ionic liquid, AOF-p has better tribological property than AOF-r because the amount of lubricant engaged in sliding on AOF-p is higher than that on AOF-r.
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