Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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oz/gal of boric acid. Typical formulations for copper fluoborate baths are given in Table XI. Maintenance and Control Contaminants Organic contaminants can affect the deposit appearance/uniformity and mechan- ical properties, especially ductility. These can be removed by carbon treatment. Cellulose filter aids, free of silica, can be used. These baths are often carbon filtered continuously. Lead is the only common metallic contaminant that causes problems, and it can be precipitated with sulfuric acid. Additives Normally, no organic additives are used. Molasses can harden deposits and minimize edge effects. Some of the same additives (e.g., acetyl cyanamide) used for copper sulfate baths can also be used with the fluoborate formulations. 209

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