Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 381 of 707

Sulfuric acid, 60% minimum Chromic acid, to saturation Water, as required Sulfuric acid, 60% minimum Glycerin, 200 ml/L Water, as required Nickel sulfate, 240 g/L Ammonium sulfate, 45 g/L Potassium chloride, 35 g/L Orthophosphoric acid, 15-70% Sulfuric acid, 15-60% Water, balance STEEL Steel is more difficult to electropolish to the same degree of perfection as other metals, owing to variations. It has good potential in industrial applications, as well as for brightening and smoothing; however, results are not consistent because of great variations in composition and surface conditions from mills and/or heat treatment. R. Delaplace and C. Bechard Pyrophosphoric acid, 400 g Ethyl alcohol to make 1 L Temperature, 20° F Current density, 300 A/ft2 Cooling of the electrolyte is required, and water must be absent. C. Faust Sulfuric acid, 15% Phosphoric acid, 63% Chromic acid, 10% Current density, 50-1,000 A/ft2 Temperature, 125° F This solution has a finite life. Weisberg and Levin Lactic acid, 33% Phosphoric acid, 40% Sulfuric acid, 15.5% Current density, 100 A/ft2 Temperature, 65-90° F Polishing rate is quite low; 1-2 hr are required. Hammond, Edgeworth, and Bowman Phosphoric acid, 55-85% Trialkali metal phosphate, 1-15% Alkali metal sulfate, 0.5% minimum Stainless Steel 380

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