▎ 摘　　要

NOVELTY - Formation of reduced graphene oxide composite film on medical titanium (Ti) alloy surface involves placing polished and cleaned Ti alloy piece in air for 3-12 hours and soaking in sodium hydroxide solution for 20-120 minutes; washing hydroxylated Ti alloy piece with distilled water and placing in silane solution for 2-12 hours; placing Ti alloy piece in graphene oxide solution and heating in water bath at 80 degrees C for 12-24 hours; and placing Ti alloy piece in drying oven, feeding argon, and heating to 200 degrees C at 1-3 degrees C/s for 2-3 hours. USE - Method for forming reduced graphene oxide composite film on medical Ti alloy surface (claimed). ADVANTAGE - The method is simple, has low cost and no environmental pollution, and produces graphene oxide composite film having excellent tribological properties and no biotoxicity. DETAILED DESCRIPTION - Formation of reduced graphene oxide composite film on medical Ti alloy surface involves: (A) placing polished and cleaned Ti alloy piece in air for 3-12 hours to generate complete oxide film on its surface and soaking Ti alloy piece in sodium hydroxide solution (0.1-5 mol/L) for 20-120 minutes to hydroxylate the surface; (B) washing hydroxylated Ti alloy piece with distilled water and placing in silane solution for 2-12 hours to self-assemble a silane film; (C) placing Ti alloy piece in graphene oxide solution (0.05-2 mg/ml) and heating in constant-temperature water bath at 80 degrees C for 12-24 hours to form silane-graphene oxide composite film on surface of Ti alloy surface; and (D) placing Ti alloy piece in drying oven, feeding argon, and heating to 200 degrees C at 1-3 degrees C/s for 2-3 hours.