Gold Electroplating Solution, high current efficiency


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SKU: EP-CG-10A-01 Category: .

Product Details



1 quart or 1 gallon poly bottle meeting UN requirements, unless otherwise specified

Quality and Deposit Characteristics

Gold plating process (CG-10A) deposit pure gold (99.99%) with excellent plate characteristics. The gold has center cubic structure and Rockwell hardness of 24 (15T scale). Gold plating to comply with MIL specifications. A gold plate of 50 millionths of an inch protects against all acid etchants (aqua regia et al) and insures corrosion resistance under all environments. Gold alloys can be deposited from gold plating solution CG-10A containing alloying element precursors (Special Gold Plating Solution – SG). The minor alloy constituent, Sb, Ga, In, or Zn, contained in the electroplate is on the order of 0.5%. 

  • GOLD – ANTIMONY (SG-20 Plating Solution) Electroplates Gold Alloy Containing 0.5% Sb.
  • GOLD – GALLIUM (SG-30 Plating Solution) Electroplates Gold Alloy Containing 0.5% Ga.
  • GOLD – INDIUM (SG-40 Plating Solution) Electroplates Gold Alloy Containing 0.5% In.
  • GOLD – ZINC (SG-50 Plating Solution) Electroplates Gold Alloy Containing 0.5% Zn.

Feature and Benefits

  • Pure-Gold deposits of 99.99%
  • High Current Efficiency of up to 100%
  • Excellent Deposits Characteristics
  • Stable plating bath
  • Qualified bath metrology for analysis and replenishment
  • Surfaces are uniform and smooth with well-controlled thickness and excellent uniformity

General Description

CG-10A and CG-10N (“PURE-GOLD”) are highly efficient (up to 100%) electroplating formulations processed from hyper-pure gold compounds and well buffered for trouble-free operation. CG-10A solution is an alkaline solution. CG-10N solution with a neutral pH is available upon request for applications where high pH is undesirable. Gold plating solutions containing alloying element (Sb, Ga, In, or Zn) are also available upon request.


Electrical contacts plated with PURE-GOLD afford very low contact resistance, in the milliohm range, and very low noise levels. Particular importance is placed in low level signal circuitry to eliminate contact noise problems. In waveguide applications gold can be relied upon to produce quality plating to prevent corrosion and to minimize RF attenuation losses. In addition, the optical properties of PURE-GOLD afford high reflectivity, greater than 90%, in the infra red region. In general, PURE-GOLD provides functional uses for electrical contacts and terminals, electronic tube base pins, switches, printed circuits, and waveguides.

SPECIAL GOLD alloy plating solutions serve as “doped” gold in a simple, convenient method in preparing low resistance, electrical contacts for semiconductors. The gold alloy plate is heat-fused at approximately 500oC to form p+ and N + ohmic contacts.

Semiconductor Material



Silicon, Germanium

Gold-Gallium (SG-30)

Gold-Antimony (SG-20)


Gold-Indium (SG-40)


Gallium arsenide, phosphide

Gold-Zinc (SG-50)

Gold-Tin (SG-60)




Safety and Documentation

Safety Information

Download Safety Data SheetContact NANO3D SYSTEMS LLC for Certificate of Analysis

SPECIFICATION (Rev. 1 050621)


Gold Electroplating Solution, high current efficiency


Au Metal content                –                  1 tr oz/gal

pH                                –                   11 – 11.8

SHELF LIFE:    This solution has 12 months shelf life.

PACKAGING: 1 guart or 1 gallon poly bottles, meeting UN requirements, unless otherwise specified.







Additional Info

General Operating Conditions for CG-10A

  • Temperature of 60 oC
  • Current Density of 10 mA/cm2
  • Anode – Gold or Stainless Steel  
  • Cathode Ratio of 2:1
  • Mechanical Agitation
  •  pH 11.0 to 11.8
  • Tank Pyrex made of glass, fiberglass or stainless steel

Quality Control

Current Efficiency

Up to 100% (controlled with current density, pH, temperature, metal concentration and agitation)


Mechanical agitation preferred.

Drag-out Recovery

Solution dragged out with the plated work may be collected in drag-out tanks. The strike tank may be used for drag-out recovery. The solution collected in a drag-out tank may be returned to the plating tank to replace evaporation losses. Alternatively the gold may be recovered from the drag-out by one of the following methods:

  1. Electrolysis
  2. Precipitation by zinc
  3. Return to refiner
  4. Ion exchange resins


The ampere-hour meter may be used as a guide in determining the required replenishment of gold, any other metal, brighteners and sometimes even cyanide. Use of an ampere-hour meter as a guide should be supplemented by the use of periodic analytical measurements, since, when the current efficiency is not near 100%, the ampere-hour meter can give erroneous indications. If periodic analyses are made at regular intervals, depending on volume of production, and the additions per ampere-hour are corrected accordingly, the ampere-hour meter can be useful in reducing time spent in maintaining gold solutions. A brief description of some analytical methods used follows:


Precipitation methods include sulfuric acid, iron (II) sulfate, sulfur dioxide and electrolysis. Volumetric methods usually use arsenic (III) oxide or thiosulfate to determine the free iodine liberated from gold (III) iodide. Use KAu(CN)2 to replenish gold.

Free Cyanide      

May be determined by titration with silver nitrate in the presence of potassium iodide indicator.


High carbonate content, 150-200 gm/liter, may change the crystal structure so that the gold plate will not polish to a high luster. Potassium carbonate concentrations of 100-120 gm/liter may be reduced to 60 gm/liter by precipitation with calcium nitrate, barium cyanide or calcium acid phosphate. Precipitants with hydroxyl ions should not be used. To promote filtration, the precipitation must be slow and form a hot solution to encourage large filterable crystals. Analysis may be done by precipitation followed by titration with standard hydrochloric acid.


Determined colormetrically by the blue phosphomolybdate color.


Determine pH electrometrically. pH must be controlled within 0.5 unit and should be between 11.0 and 11.8. Since pH normally increases, acidic additives such as bicarbonates,  monobasic phosphates or phosphoric acid may be added to maintain the pH in the proper range.