By V. F. Henley

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Additional resources for Anodic Oxidation of Aluminium and its Alloys: The Pergamon Materials Engineering Practice Series

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The C-clamp holds the work firmly against an aluminium or titanium bar. They do not need stripping as their function is purely mechanical and they do not conduct any of the anodizing current. The bars against which the work is clamped will, if FIGURE 6. DIAGRAM OF BASKET ANODIZING SYSTEM FOR VERY SMALL COMPONENTS. (Courtesy: W. Canning & Co. ) 48 Anodic Oxidation of Aluminium and Its Alloys aluminium, need stripping after each load. Unlike racks carrying prongs at set distances apart, the C-clamp system provides adjustment.

Careful attention to the jigging of the work during anodizing usually cures this problem. However, there are occasions when, for example, welded window frames are made from hollow extruded sections. In this case 12 mm holes must be drilled in opposite corners of the frame to allow electrolyte to drain out. It is not sufficient to rely on the liquid tightness of the welds. The technique of anodizing and colouring has advanced to the stage where acceptable limits for the matching of components can be agreed between the purchaser and the anodizer.

These factors in turn affect the properties of the film and, in particular, the "blooming" of the film, which in some forms may not occur until a long period after anodizing. High temperatures tend to give powdery films. Automatic control (for example by thermostat) to within ±1°C is essential for consistent results. Very efficient agitation is needed to disperse the heat generated during the anodizing process. Local overheating increases current density (or reduces applied voltage if current density is kept constant) to give films of uneven and uncontrolled quality.

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