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By V. F. Henley

ISBN-10: 0080267254

ISBN-13: 9780080267258

ISBN-10: 0080267262

ISBN-13: 9780080267265

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Extra resources for Anodic Oxidation of Aluminium and its Alloys

Sample text

Suitable metals — generally in the form of square or round rod or wire — include titanium, pure aluminium and the aluminium alloy 6063. Joints may be either riveted or welded. The aluminium alloy 6063 in the TD condition makes good spring contacts. Expanded aluminium is often used for racks and baskets, and pure aluminium in the soft condition is used for twisting round articles. The twisting method is, however, wasteful in time, space and material and should only be used where jigging is unsuitable.

These fumes must be exhausted and scrubbed before discharging to the atmosphere. An immersion of 2 minutes is the average. 7% + aluminium (see Table 3). g. 42). Drag-out losses are made up by adding the ready mixed solution. To offset the high cost of the solution it is now possible to buy recovery units to reclaim phosphoric acid from the first rinse tank which is kept warm and static. g. 42 or 1% chromic acid or a proprietary mixture based on ferric sulphate. These de-smudging solutions, all of which are at room temperature, remove the thin copper-containing film that is left on the metal during chemical polishing.

84 60-75% by volume 25-40% by volume This solution is used at 95-100°C. The work should be clean and well drained or dry before immersion in this solution. Hydrogen is evolved during the reaction but the highly viscous solution prevents spray emission. After about 2-3 minutes' immersion (heavier pieces requiring extra time to attain the operating temperature) the work is removed and drained. A white foam forms on the metal during the draining period. The work is then plunged into a 1% solution of chromic acid.

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Anodic Oxidation of Aluminium and its Alloys by V. F. Henley

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