MAR CHROME PRO ELITE is a specially formulated High Speed Functional Chromium electroplating process which is fluoride free. The high-speed capabilities are a function of the chemistry design, which allows higher current efficiencies. The system has the capability of processing at much higher current densities as compared to conventional systems, which do not use secondary catalysts. The increase in the deposition rate is a result of the increase in the current efficiency.
The MAR CHROME PRO ELITE system, unlike the conventional mixed fluoride catalyst systems, does not cause cathodic low current density etching.
The electroplated deposits from the MAR CHROME PRO ELITE system exhibit very shiny, bright and smooth surfaces. The micro-hardness of the deposit shows values in the 1,000 KHN100 range, with a micro-cracked count greater than 1,000 cracks per linear inch providing superior corrosion resistance. With these characteristics, there is a very noticeable increase in the wear performance of this deposit.
The MAR CHROME PRO ELITE plating system is maintained with a liquid additive 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.
MAR CHROME PRO ELITE
|Chromic Acid||32 oz/USG (240 g/litre)|
|Sulphate radical||0.36oz/USG (2.70 g/litre)|
|Ratio||75 – 120|
|Temperature||130°F – 140°F (55°C – 60°C)|
|Cathode Current Density Range||2 – 10 ASI (30 – 154 ASD)|
|Anode Current Density||1 – 5 ASI (15 – 77 ASD)|
|Plating Rates (approximate)||2 ASI 60°C 1.3 mil/hr
4 ASI 60°C 2.8 mil/hr
6 ASI 60°C 4.5 mil/hr
Existing Chromium Solution Conversion
Most chromium plating solution can be converted to the MAR CHROME PRO ELITE. An analysis of the impurities must be done to determine the level of metallic contamination prior to conversion. Fluoride type of systems can not be converted to the MAR CHROME PRO ELITE.
New Plating Solution Make-up
A new make-up can be accomplished by two methods. The use of MAR CHROME PRO ELITE MU-L can be used. This liquid contains 480 g/litre of Chromic Acid and the required amount of MAR CHROME PRO ELITE catalyst. MAR CHROME PRO ELITE MU-S is a solid make-up containing chromic acid and the appropriate catalyst quantity. The second method of make-up would be the use of Chromic Acid solid and the correct amount of MAR CHROME PRO ELITE C ADDITIVE.
Using MAR CHROME PRO ELITE MU-L
Dilute to volume with DI water.
Using MAR CHROME PRO ELITE MU-L.
Add DI water to ½ the volume
Bring the solution to the correct level with DI Water.
Heat the solution to the operating temperature of 140°F (60°C). At this time analyze the plating solution of sulphate. Add Sulphuric Acid to bring the sulphate content to 0.33oz/USG (2.5 g/l). Electrolyze the plating solution for 5 hours to form equilibrium with all of the components.
The MAR CHROME PRO ELITE plating solution can be maintained using the liquid MAR CHROME PRO ELITE RL or the solid MAR CHROME PRO ELITE RS. Both systems contain Chromic Acid and the secondary catalyst. The sulphate catalyst is maintained by analysis and adjustments are made with Sulphuric Acid or Barium Carbonate.
The liquid MAR CHROME PRO ELITE RL contains 450 g/l of Chromic Acid and the secondary 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.
The solid MAR CHROME PRO ELITE RS contains the Chromic Acid and the secondary 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.