| 摘要 |
1411391 Anodizing niobium bodies SIEMENS A G 18 Sept 1972 [18 Sept 1971] 43180/72 Heading C7B The inner niobium surface of a rotating hollow body is anodized whilst partially immersing the body in electrolyte such that all space within the body and above the electrolyte surface is in contact with the outer environment throughout the process, no part of the inner surface is permanently submerged, and a counter-electrode extending through the aperture is positioned such that bubbles formed at the cathode during electrolysis rise to the surface of the electrolyte without contacting the niobium surface being anodized. As shown a hollow niobium body comprising parts 1-5 is positioned to rotate about axis 8 whilst immersed in electrolyte to the level of said axis; a cathode 14 extending into the hollow body and positioned just below the surface of the electrolyte; is mounted on rollers 11, 12; and is rotated by means of motor 9, belt 10 and flange 7 connected to the tubular part 4 of the hollow body. The electrolyte contained in tank 6 may be ammonia. The outer trough 23 may be flushed with liquid for controlling the liquid temperature. Prior to anodizing, the niobium surface may be chemically or electrolytically oxidized. The external surface of the body may be of copper, and may be masked during anodizing. |
