SURFACE TREATMENT METHOD FOR SLIDING MEMBER, SLIDING MEMBER, MECHANICAL KEY AND PORTABLE TOOL

PROBLEM TO BE SOLVED: To provide a surface treatment method for a sliding member where, when a diamond like carbon film comprising silicon is formed on the surface of a base material, not only sliding properties such as wear resistance but also corrosion resistance can be suitably secured, to provide a sliding member, to provide a mechanical key, and to provide a portable tool. SOLUTION: On the surface of a sliding member 10, a nitriding layer 12a for securing the adhesion of a DLC-Si film 13 stacked in the following stage is formed, and thereafter, the DLC-Si film 13 is formed on the surface of the nitriding layer 12a by plasma CVD. Then, treatment temperature at this time is controlled to 350 to 430°C. In this way, the formation of a complex compound of chromium, nitrogen and carbon as a compound to form into an obstacle upon the securance of its corrosion resistance can be suppressed. It is generally known that the formation of the complex compound remarkably reduces its corrosion resistance. Thus, not only sliding properties such as low friction properties and wear resistance but also corrosion resistance can be suitably secured. COPYRIGHT: (C)2008,JPO&INPIT