Metal Finishing Guide Book


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removes any traces of the sealing smut. Irregular shaped parts, castings, etc. are best finished by brushing with a Tampico brush or by tumbling with sawdust or other suitable media. PRETREATMENT Cleaning Proper and thorough cleaning of the aluminum surface prior to anodizing is one of the most important steps in the finishing process. Improperly cleaned material accounts for more reruns and rejected parts than any other single factor. It is essential that all machining oils, greases, body oils, and other surface contaminants be removed prior to the continuation of the anodizing sequence. Both alkaline- and acid-based proprietary cleaners are available that will do an adequate job. If the oils or greases are specific in nature, some cleaners may need to be ���customized��� for adequate results. What is clean? Generally, we speak of a part being clean if it exhibits a ���waterbreak-free��� surface. This means that if the water rinses off of the metal surface in a continuous sheet, the work is considered to be clean. If, on the other hand, the water ���beads��� up or forms water breaks, the part still has foreign matter on the surface and continued cleaning is necessary. Once the part has been determined to be clean, subsequent finishing steps can proceed. Etching Etching is the removal of some of the aluminum surface from a part using 469

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