The effects of water environment such as temperature and dissolved ions on tribological properties of DLC against brass were studied for development of the water-lubricated hydraulics, valves and cylinders based on metal. A ball-on-disk type rotating tribotester was used for detailed examination of above mentioned factors. DLC was deposited on the disk by the unbalanced magnetron spattering system. Pure water and quasi-tap water were used to study the effects of dissolved ions. The results show that temperature and dissolved ions have major impact on the wear of DLC. EPMA, XPS and AES indicate that tribo-layer on the metal surfaces, consists of carbon and the base metal and some element from water, plays important role for the phenomena.

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