24K, 18K & 14K Bright Gold Plating Solution - TDS
Gold Plating Services’ 24K, 18K & 14K Bright Gold Plating Solution is cobalt hardened acid gold electroplating solution that will yield a relatively low stress, fine grained deposit with 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;
Fine gold content- Varies – range from ¼ to 1 Troy oz per gallon
Purity - 99.7 percent gold minimum (24 karat)
Hardness - Knoop hardness 130-200
Density of Plate - 12.45 mg/in²/µm (thickness)
Theoretical Coverage* Assuming a gold content of 2.5 grams fine gold per liter of solution, coverage would be ~ 800 in²/liter with the gold plated to an average decorative thickness. A gold plating thickness of 8 - 10 micro-inches is a common thickness for decorative gold plating and exceeds the US Federal Trade Commission standards for, (non-jewelry), gold plated items to be marketed as “gold plated”.
*This coverage is based on the assumption that all gold in the solution will be deposited. In actual practice this is not likely since the cathode efficiency diminishes with metallic content depletion making the solution unusable at extremely low metallic content. As the solution is depleted the cathode efficiency will diminish as shown on the Depletion Table found at http://www.goldplating.com/chemicals/24KBrightGoldDepletionTable.htm .
Hardness 130 - 200 Knoop
Solution gold content .25 - 1 troy oz per gallon Varies – range from ¼ to 1 Troy oz per gallon (2 - 8.22 grams/liter)
Operating Temperature 90 - 105 ° F – optimum is 100° F
Anode to Cathode ratio 2:1 or higher
Specific Gravity 11 - 16 Be
pH (electrometric) 4.2 - 4.8
Time to deposit 0.00004" (~ 1 micron) 8 - 10 minutes @ 6 Amperes per square foot, (ASF)
Replenishment Add 24K Bright replenisher as required to maintain metallic content at desired levels. See depletion table.
Efficiency at normal operation gold content 20% - 38 % (with increased metallic content efficiency can reach 38%)
Current Density - cathode 5 - 15 Amperes/ft², (35 - 105 ma/in²)
Anode material 316 Stainless Steel, Platinized Columbium, Platinized Titanium or graphite
Agitation cathode movement or solution pumping
Tank, pump and tubing material glass, polyethylene, polypropylene or other material inert to solution.
Read and understand SDS sheets before using: For professional use by trained technicians only.