Technical Data Sheet

24k Hard Acid Immersion Gold

Pricing

Gold Plating Services’ Hard Acid Immersion Gold is cobalt hardened acid gold electroplating solution that will yield a relatively low stress deposit with a hardness range of 130-200 Knoop.  This solution is ideally suited for printed circuit boards, contacts, reflectors, as well as heavy decorative deposits

 

The purity, and hardness of the final electrodeposited gold will be equivalent to Type I, and 2, Grade C, specifications as indicated in MIL-G-45204C, as follows;

 

Purity

 99.7%+

Hardness

 130 - 200 Knoop

Solution Metallic Content

 .25 - 1 troy oz per gallon

Range
Operating Temperature 90 - 105 ° F
Anode to Cathode ratio 2:1 or higher
Specific Gravity 11 - 16 Be
pH (electrometric) 4.3 - 4.8
Time to deposit 0.0001" (2.5microns) 12 minutes @ 10 ASF
Replenishment .5 Hard Acid Gold Replenisher solution every 300 ampere minutes
Filtration Continuous
Efficiency 25- 50 %
Current Density 5 - 15  ASF
Anode 316 Stainless Steel, Platinized Columbium, Platinized Titanium or graphite
Agitation cathode movement or solution pumping

Note:  pH will slowly rise during operation and should be checked every 100-ampere minute with a glass electrode pH meter.  To lower the pH use reagent grade phosphoric acid diluted in DI water.  To raise the pH use reagent grade potassium hydroxide dissolved in DI water.

Before using with this solution, plastic tanks, tubing, pumps, etc. should have a 5 to 10% solution of sulfuric acid allowed to remain in the tank for 24 hours.  Run the acid solution through the tank and in the filter system for 2 hours.  Drain and rinse the tank and filter thoroughly.  Repeat rinsing with fresh water until pH is above 4.5.

Read and understand MSDS sheets before using:  For professional use by trained technicians only.

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