Monday, January 5, 2009

Baths for Bright Dipping of Metals

1. Steel
  • 25 to 30 g/l oxalic acid plus 10 to 15 g/l 100-volume hydrogen peroxide and 0.08 g/l of sulfuric acid.
2. Copper and Copper Base Alloys
  • 40 to 45% (vol) sulfuric plus 20 to 25 %(vol) of nitric acid and 0.1% (vol) of hydrochloric acid at room temperature.
  • 270 g/l chromic acid at room temperature.
  • 55% phosphoric acid, 20% nitric acid, and 25% acetic acid, all by volume, at 55 to 80oC.
3. Stainless Steel
  • 25% sulfuric acid, 4% hydrochloric acid, and 3% nitric acid, all by volume.
4. Lead
  • 3.5% glacial acetic acid and 3.5% 30-volume hydrogen peroxide by volume.
5. Nickel and Nickel Alloys
  • Various combinations of sulfuric acid, phosphoric acid, and nitric acid are used. A typical bath contains 60% phosphoric acid, 20% sulfuric acid, and 20% nitric acid, all by volume. Operates at room temperature.
Last Blog: Chemical and Electrolytic Brightening

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