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By V. F. Henley

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For the production of polished decorative finishes reference should be made to Tables 1, 2 and 3. In order to provide a matching finish between sheet, extrusions and castings it may be necessary to specify different coating thicknesses on the various materials. When selecting polishing compositions for aluminium one must avoid those containing green chromium oxide or red rouge. These coloured compounds become embedded in the metal and cause a green or red stain in the anodic coating. Sand a n d vapour blasting The effect of both these processes is to disturb the metal surface to give a degree of matting, varying with the size of grit being used.

Of the effluent, and these requirements will in turn govern the design of any effluent-treatment equipment (see Chapter 16). Anodizing Equipment 31 ANCILLARY SERVICES FOR ANODIZING Process Heating Steam Most anodizing plants are heated by immersed steam heated coils supplied from a boiler which may be fuelled by oil, gas, solid fuel or electricity (electrode-type boiler). The choice of boiler will depend on the size of installation, the relative prices and convenience of the alternative fuels.

All steam mains and piping should be adequately lagged. 2. All internally heated tanks should be lagged on the outside, including the bottom. 3. Where practicable, hot tanks not in use should be covered. 4. Hot tanks in constant use, especially at 90°C or over, should have mechanically operated covers or, if convenient, be covered with a double layer of polypropylene spheres. 5. Any reduction in the efficient operating temperatures of heated solutions will reduce heating costs. For example, cleaning solutions have been formulated to operate at lower than usual temperatures.

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