Chrome
MAR Chrome Pro DFS
MAR Chrome Pro DFS is a specially formulated High Speed Decorative Fluoride Chromium electroplating process which is a custom blend of the secondary fluoride type of catalyst with Chromic Acid. This high-speed capability is a function of the chemistry design, which allows higher cathode current efficiencies.
The electroplated deposits from the MAR CHROME PRO DFS system exhibit a very shiny, bright and smooth surface at a large range of current densities. The operating plating current density range will vary with applications; however, the normal plating range varies from 100 to 400 ASF (15 – 43 Amps/dm2).
The MAR CHROME PRO DFS system exhibits excellent activation for plating Stainless Steel.
The MAR CHROME PRO DFS plating system is maintained with a liquid additive MAR CHROME PRO DFS RL which eliminates dusting and splash back from solid additions. The system consistency can be maintained using an amp-hour control system. Standard pretreatment cycles, anodes and equipment can be used as those in any hexavalent chromium plating systems.
A solid version, MAR CHROME PRO DFS RS of this system, is also available to minimize the transportation of water over a large distance. It contains all of the active components to maintain the working solution at optimum operating chemical parameters.
Recommended Operating Parameters
MAR CHROME PRO DOS
| COMPONENTS | OPTIMUM | RANGE |
| Chromic Acid | 32 oz/USG (240 g/litre) | 20 – 50 OPG (150-375 g/l) |
| Sulphate radical | 0.16 oz/USG (1.2 g/litre) | |
| Ratio | 200:1 | 125 - 250 |
| Temperature | 110°F (43°C) | 100°F – 125°F (38°C-52°C) |
| Cathode Current Density Range | 100 ASF (15.5 ASD) | 100 - 400 ASF (15.5 – 43 ASD) |
Plating Solution Make-up and Conversions
Existing Chromium Solution Conversion
Most conventional decorative plating solutions can be converted to the MAR CHROME PRO DF RS. An analysis of the impurities must be done to determine the level of metallic contamination prior to conversion
New Plating Solution Make-up
A new make-up can be accomplished by two methods. The use of MAR CHROME PRO DFS MU-L can be used. This liquid contains 490 g/litre of Chromic Acid and the required amount of MAR HC – 21 CAT secondary catalyst. The second method of make-up would be the use of solid MAR CHROME PRO DFS MU-S which contains the correct amount of the secondary catalyst.
Using MAR CHROME PRO DRS MU-L
- For each 100 Litres of plating solution: 12 litres of MAR CHROME PRO DFS MU-L
- For each 100 USG of plating solution: 12 USG of MAR CHROME PRO DFS MU-L
Dilute to volume with DI water.
Using MAR CHROME PRO DFS MU-S
Add DI water to ½ the volume
- For each 100 litres of plating solution: 24 Kg of MAR CHROME PRO DFS MU-S
- For each 100 USG of plating solution: 200 Lbs. of MAR CHROME PRO DFS MU-S
Bring the solution to the correct level with DI Water.
Heat the solution to the operating temperature of 100°F (38°C). At this time analyze the plating solution of sulphate. Add Sulphuric Acid to bring the sulphate content to 0.16 oz/USG (1.2 g/l) if required. Electrolyze the plating solution for 1 hours to form an equilibrium with all of the components.
PLATING SOULTION MAINTENANCE
The MAR CHROME PRO DFS plating solution can be maintained using the liquid MAR CHROME PRO DFS RL or the solid MAR CHROME PRO DFS RS. Both systems contain Chromic Acid and the Fluoride type secondary catalyst. The sulphate catalyst is monitored by analysis and adjustments are made with Sulphuric acid or Barium Carbonate if required.
The liquid MAR CHROME PRO DOS-RL contains 450 g/l of Chromic Acid and the secondary fluoride type catalyst. Additions can be made at a rate of 350 ml per 1,000 amp-hours using an amp-hour controller with a feeder pump. Compensation for drag-out must be considered and added to the feed rate.
The solid MAR CHROME PRO DFS RS contains the Chromic Acid and the secondary fluoride type catalyst and can be added to the plating solution at a rate of 15 KG per 100,000 amp-hours or by analysis of the Chromic Acid in the plating solution. Compensation for drag-out must be considered and added to the feed rate.
On occasions when reverse etching is performed in the plating tank, additions of the MAR CHROME PRO HC-21 CAT will be required to bring the Active Fluoride Catalyst to the correct range. This may be necessary to compensate for the depletion of the active fluoride by the formation of a complex of iron and fluoride. Additions will be recommended by analysis only.
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