Zinc

MAR ZINC PRO ALK 100

MAR ZINC PRO ALK 100 is the most advanced alkaline non-cyanide zinc plating system on the market in Europe. It posses the distribution advantages of alkaline zinc systems while approaches the efficiency advantages of chloride zinc.

MAR ZINC PRO ALK 100 eliminates the need for costly extra additive and is packaged as a simple to operate three component system.

ADVANTAGES
  • Durable
    • Resists contamination.
    • Stable at high caustic concentrations.
    • Performs even at 110° F.
  • Simple
    • Has a simple three component additives.
      • Brightener
      • Carrier
      • Purifier
  • Reliable
    • No latent blistering.
    • No blue bright yellowing.
    • Wide operating range.
  • Fast
    • Excellent plate distribution.
    • Excellent throwing power.
    • High cathode efficiency.
Plating Solution Composition
Rack: Barrel:
Zinc Metal 8 - 11 g/l 10 - 14 g/l
NaOH (Caustic Soda) 110 - 130 g/l 120 - 150 g/l
Na2CO3 ( Sodium Carbonate) 10 g/l min. 10 g/l min.
MAR Zinc Pro ALK 100 B 15 – 25 ml/l 15 – 25 ml/l
MAR Zinc Pro ALK 100 C 10 – 20 ml/l 10 – 20 ml/l
MAR Zinc Pro ALK 100 P 5 – 10 ml/l 5 – 10 ml/l
Operating Conditions
Rack: Barrel:
Temperature 30° C
20 – 35°C		 30° C
20 – 35°C
Cathode Current Density 0.5 – 3 A/dm²
(4.5 – 28 ASF)		 0.3 – 1.5 A/dm²
(2.8 – 14 ASF)
Anode Current Density 0.3 – 3 A/dm²
(2.8 – 28 ASF)		 0.3 – 3 A/dm²
(92.8 – 28 ASF)
Voltage 3 – 8 Volts 9 – 15 volts
Process Control

Zinc (Zn):

The zinc metal concentration is important since it greatly affects the cathode efficiency and therefore the plating speed. Lower zinc concentrations reduce the cathode efficiency significantly, resulting in lower plating speed especially at higher current densities and will also produce solution gassing which may be objectionable. Zinc concentrations in the range shown will produce optimum results.

Zinc concentration can be conveniently controlled by the adjustment of the zinc anode area. Zinc content may be decreased by removal of a portion of the zinc anode area or increased by the addition of zinc anode area. If polarization occurs when anode area is reduced (noted by increased gassing at the anode and drop in amperage for a given voltage), a portion of the anode area removed may be replaced with low carbon steel.

Zinc will dissolve in the solution during periods of non-use resulting in increasing the zinc content. It is suggested that the zinc anodes be removed from the solution prior to idle periods of more than 24 hours and additions of sodium hydroxide be delayed until startup.

Zinc content can also be controlled very effectively by the use of a “Zinc Generator” tank outside the actual plating tank. The regular zinc anode in the plating cells can be replaced with low carbon steel.

NaOH (Caustic Soda):

Sodium hydroxide is necessary to provide good bath conductivity and to prevent precipitation of the zinc. Sodium hydroxide should be maintained within the range specified. It must be controlled by analysis and regular adds are required.

Sodium Carbonate Na2CO3 (Soda Ash):

To ensure proper deposit characteristics with new MAR Zinc Pro ALK 100 plating solution, it is necessary to add approximately 10 g/litre of sodium carbonate at the time of make-up. Sodium carbonate is normally formed during the operation of alkaline non-cyanide plating solutions and should be controlled by its continuous removal by chilling the solution to maintain its concentration at reasonable levels.

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