Determination of Free Cyanides concentration in Bronze, Silver and Alkaline copper bath
The analysis of cyanides in electroplating baths is essential to ensure the quality of the deposition process, operator safety and environmental control. Cyanide baths, such as those used for alkaline copper plating, bronze plating and silver plating, allow for uniform deposition thanks to the formation of stable complexes with metal ions. Copper plating, in particular, is used both to protect against atmospheric corrosion and to improve the adhesion and protective effectiveness of subsequent nickel plating. In cyanide silver plating baths, cyanides form soluble complexes that are essential for depositing uniform, adhesive layers on electrical components and high-quality manufactured goods, ensuring excellent corrosion resistance, preservation of conductivity and long-term reliability against oxidation.
Monitoring cyanide concentration is essential: inadequate levels can compromise adhesion and deposit quality, while excess levels increase toxicity risks and treatment costs.
Metodica
Test Type: End Point.
Time testing: 11 minutes
Analysis sessions with multiple samples are possible up to a maximum of 16 tests for CDR GalvanLab®.
Sample Treatment
The sample can be used as is. The sample needs to be diluted only for the following curves: bronze [1-100] g/L, alkaline copper [1-50] g/L and silver [100-300] g/L.
Test Principle
The content of cyanides is determined, after dilution, by reaction with a chromogen. The test has a total duration of 10 minutes at the end of which the signal related to the colored complex formed is detected.
Calibration Curve
The calibration curve was obtained by correlating the CDR method with the reference method.
Measuring range Bronze
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Free Cyanide bronze bath [1-100] g/L | 1 - 100 g/L | 0.100 g/L | 0.5 g/L |
| Free Cyanide on bronze bath [0.01-1] g/L | 0.01 - 1 g/L | 0.001 g/L | 0.012 g/L |
Measuring range Silver
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Free Cyanide silver bath [100-300] g/L | 100 - 300 g/L | 1.000 g/L | 3 g/L |
| Free Cyanide silver bath [3-80] g/L | 3 - 80 g/L | 0.100 g/L | 0.7 g/L |
Measuring range Alkaline copper
| Analyses | Measuring range | Resolution | Repeatability |
|---|---|---|---|
| Free Cyanide alkaline copper bath [1-50] g/L | 1 - 50 g/L KCN | 0.100 g/L KCN | 0.5 g/L KCN |
| Free Cyanide alkaline copper bath [20-100] g/L | 20 - 100 g/L KCN | 0.100 g/L KCN | 1.1 g/L KCN |
Reagent test Kits
The chemical analysis instrument for electroplating baths
CDR GalvanLab®
- Complete analysis panel, supplied already configured
- Up to 16 determinations simultaneously
- Possibility of carrying out analyses of the same sample
- Integrated printer
- Full connections (LAN - USB - Bluetooth barcode/QR code reader)
