| 摘要 |
PURPOSE:To provide a cylinder which is decreased in a gas adsorption amount, by a method wherein a very smooth passivated film is formed on the inner surface of the cylinder by an electrolytic composite polishing method. CONSTITUTION:The cathode side and the anode side of a d.c. or impulsive voltage are connected to a cathode 2 of a tool 1 and a metal to be polished, respectively. In polishing processing, electrolyte 5 is fed and the cathode 2 is rotated in a state to be pressed against the metal to be polished, a passive oxidation film formed in the uneven surface of the surface of the metal to be polished, and the projected part of the film is abraded for removal by means of polishing grains 6 to electrolytically elute the projected part of the metal to be polished in priority and selectively for polishing. This constitution enables provision of a cylinder which is decreased in a gas adsorption amount. |
