Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS. THESE CONTAIN INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

Procedure

1. SUBTASK 70-33-16-100-001 Nitric Acid Stripping Solution

   1. Composition.

      1. The solution is an aqueous solution that has an initial make-up of 1 part by volume of CoMat 01-025 NITRIC ACID HNO3, TECHNICAL GRADE - (SG 1.42) and 1 part by volume of water.

   2. Preparation.

      1. NOTE

         The tank or container must be kept as small as possible, in relation to the size of the parts to be plated.

         Prepare the solution by carefully adding, whilst constantly stirring, 17.2 to 17.6 fl oz (490 to 500 ml) of nitric acid to 17.6 fl oz (500 ml) of water.

   3. Analysis.

      1. Analysis is not necessary, because the solution will be discarded when it ceases to be effective.

2. SUBTASK 70-33-16-100-004 Nickel Chloride Strike Solution

   1. Composition and operation.

      1. This solution is an aqueous solution that has an initial make-up of 400 g/l of CoMat 01-077 NICKEL CHLORIDE NiCl2+6H2O and 110 ml/l of CoMat 01-099 HYDROCHLORIC ACID.

      2. The solutions are contained in a plastic tank or a rubber lined tank and are used at room temperature 59 deg F to 77 deg F (15 deg C to 25 deg C).

   2. Preparation.

      1. To make 1 liter of this Nickel Chloride Strike Solution, do the subsequent procedure. Increase the quantities in proportion to make larger volumes of solution. Decrease the quantities in proportion to make smaller volumes of solution.

         1. Add 400 g CoMat 01-077 NICKEL CHLORIDE NiCl2+6H2O to approximately 750 ml water. Stir to mix fully.

         2. Add 110 ml CoMat 01-099 HYDROCHLORIC ACID. Stir to mix fully.

         3. Add the correct volume of water to increase the solution volume to 1 liter.

      2. To make 1 US gal of this Nickel Chloride Strike Solution, do the subsequent procedure. Increase the quantities in proportion to make larger volumes of solution. Decrease the quantities in proportion to make smaller volumes of solution.

         1. Add 3.3 lb CoMat 01-077 NICKEL CHLORIDE NiCl2+6H2O to approximately 3 qt (96 fl oz) of water. Stir to mix fully.

         2. Add 14.1 fl oz CoMat 01-099 HYDROCHLORIC ACID. Stir to mix fully.

         3. Add the correct volume of water to increase the solution volume to 1 US gal.

   3. Analysis.

      1. Analyze the nickel chloride strike solution for nickel chloride content refer to SPM TASK 70-33-16-200-502. Keep the nickel chloride content at 300 g/l to 400 g/l.

      2. Analyze the nickel chloride strike solution for hydrochloric acid content refer to SPM TASK 70-33-16-200-502. Keep the hydrochloric acid content at 25 g/l to 40 g/l.

3. SUBTASK 70-33-16-100-008 Silver Strike Solution

   1. Composition.

      1. The solution is an aqueous solution that has an initial make-up of 0.4 oz/gal to 0.6 oz/gal (3.0 g/l to 5.0 g/l) of CoMat 01-292 SILVER CYANIDE AgCN and 6.7 oz/gal to 13.4 oz/gal (50 g/l to 100 g/l) of CoMat 01-107 POTASSIUM CYANIDE KCN95% MIN in water.

   2. Preparation.

      1. Dissolve the potassium cyanide in a small quantity of water.

      2. Dissolve the silver cyanide in the solution.

      3. Add water to make up the solution to the correct volume.

   3. Control.

      1. Maintain the free potassium cyanide content at 6.7 oz/gal to 13.4 oz/gal (50 g/l to 100 g/l).

      2. Maintain the silver content at 0.2 oz/gal to 0.5 oz/gal (1.5 g/l to 3.5 g/l).

   4. Analysis.

      1. Analyze the silver strike solution for silver content refer to SPM TASK 70-33-16-200-502.

      2. Analyze the silver strike solution for free potassium cyanide content refer to SPM TASK 70-33-16-200-502.

4. SUBTASK 70-33-16-100-009 Silver Plating Solution

   1. Composition.

      1. The solution is an aqueous solution that has an initial make-up of 8.0 oz/gal (60 g/l) of CoMat 01-292 SILVER CYANIDE AgCN, 11.5 oz/gal (86 g/l) of CoMat 01-107 POTASSIUM CYANIDE KCN95% MIN and 0.1 oz/gal (1 g/l) of CoMat 01-288 AMMONIUM THIOSULPHATE in water.

   2. Preparation.

      1. Dissolve the potassium cyanide in a small quantity of water.

      2. Dissolve the silver cyanide in the potassium cyanide solution.

      3. Dissolve the ammonium thiosulfate in water, then add it to the potassium cyanide and silver cyanide solution whilst agitating the potassium cyanide and silver cyanide solution.

      4. Add water to make up the solution to the correct volume.

   3. Control.

      1. Maintain the free potassium cyanide content at 6.1 oz/gal to 10.7 oz/gal (46 g/l to 80 g/l).

      2. Maintain the silver content at 6.0 oz/gal to 6.7 oz/gal (45 g/l to 50 g/l).

   4. Analysis.

      1. Analyze the silver plating solution for silver content refer to SPM TASK 70-33-16-200-502.

      2. Analyze the silver plating solution for free potassium cyanide content refer to SPM TASK 70-33-16-200-502.