Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Table IV. Bath Parameters for an Alkaline Zinc-Cobalt Bath Parameters Zinc metal Sodium hydroxide Cobalt metal Temperature Cathode current density Anodes Table V. Bath Parameters for an Acid Zinc-Iron Bath Parameters Ferric sulfate Zinc sulfate Sodium sulfate Sodium acetate Table VI. Bath Parameters for an Alkaline Zinc-Iron Bath Parameters Zinc metal Iron metal Sodium hydroxide Temperature Cathode current density Anodes Table VII. Bath Parameters for a Neutral pH Tin-Zinc Bath Parameters Tin (metal) Zinc (metal) Stabilizer Rack 20 g/L 8 g/L Antioxidant Temperature pH Cathode current density Anodes Tin-Zinc Alloy Ratio Tin-zinc alloy plating Chromated Zinc Yellow plating Nonchromated 60/40 60/40 75/25 85/15 60/40 75/25 85/15 Iridescent Chromated 120 g/L 80 g/L 18-25o 6.0-7.0 C 18.5 A/ft2 Tin/zinc (65/35-75/25) mixed anodes Table VIII. Sulfur Dioxide Gas Corrosion Test Thickness (µm) 10 5 5 5 5 5 5 5 10 Sulfur dioxide gas concentration, 200-300 ppm; temperature, 40 ±2° 264 Hours to 12 12 9 12 20 50 50 12 12 C; humidity, >95%. Hours to White Corrosion Red Corrosion 400 210 170 185 250 400 250 200 250 Amounts 6-9 g/L 100-130 g/L 30-50 mg/L 21-32° C 2.0-4.0 A/dm2 Steel Amounts 200-300 g/L 200-300 g/L 30 g/L 20 g/L Amounts 8-15 g/L 0.05-0.1 g/L 120-140 g/L 18-23O C 1.5-3.0 A/dm2 Steel Barrel 10 g/L 10 g/L 120 g/L 80 g/L 18-25o 6.0-7.0 C 5.0 A/ft2

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