Copper Tin Alloy Electroplating Imitation Gold plating ; FF-5130
FF-5130 can be used to replace cyanide gold imitation and pyrophosphate gold imitation processes. This product can obtain gold imitation coating in a wide range of current density. The solution does not contain cyanide and phosphorus compounds, and the wastewater treatment is environmentally friendly.
1. Features
1.1 The current efficiency is more than 90%, the coating is dense and bright, and the deposition rate is about 0.2 um/min(1.0A/dm2)； The appearance of the coating is uniform and gold like. Within the current density range of 0.05~2.7 A/dm2, the tin content of the coating is uniform and 9~12%, and the deep plating ability is excellent; The bath is easy to maintain. Except for tin salt which needs to be supplemented additionally, other substances only bring out loss. It can be electroformed to imitate gold coating, if the thickness is more than 10μm, the appearance and quality of the coating remain unchanged.
1.2 Plating tank: PVC, polypropylene.
1.3 Filtration: continuous filtration, and the plating solution must be filtered with PP filter element (the porosity should preferably be 1um. At least 5 um). Continuous filtration is to keep the plating solution clean. Before use, the filter element must be soaked in 10% potassium hydroxide solution at 60℃ for several hours, and then rinsed with water before use. In order to ensure good filtration and mixing, the circulation volume of the filter pump must reach 5 cycles per hour.
1.4 Heating: titanium serpentine steam tube, titanium electric heating pen or quartz electric heating pen.
1.5 Mixing: air mixing and solution filtering mixing are carried out together. The coating can be uniform without pinholes.
1.6 Anode: electrolytic copper (with anode bag, area ratio of cathode to anode: 1:2-4).
1.7 Rectifier: the current output can meet the requirements of electroplating operation, and the ripple is less than 5% of the standard CDC power supply. Ammeter, voltmeter and continuous current trimmer must be equipped. An ammeter must be used.
2. Solution composition and process parameters
2.1 composition of plating solution
| composition | range | optimal |
| FF-5130 M(complexing agent) | 350~450ml/L | 400 ml/L |
| FF-5130RS(tin salt) | 200~300ml/L | 250 ml/L |
| CuSO4.5H2O(copper salt) | 24~36g/L | 30 g/L |
| temperature | 35~40℃ | 38℃ |
| PH | 10.5~11.0 | 10.8 |
| Cathode current density | 0.2~3.0 A/dm2 | 1.0 A/dm2 |
3. Solution preparation
3.1 Bath and filter cleaning: first soak and clean with sodium hydroxide solution, and then soak and clean with dilute sulfuric acid solution;
Note: If the bath has been used with cyanide, it needs to be soaked and cleaned with (dilute sodium hydroxide solution + hydrogen peroxide) and (dilute sulfuric acid + hydrogen peroxide) to strictly remove cyanide. The cyanide-free imitation gold bath should be strictly isolated from the cyanide bath to avoid cyanide pollution.
3.2 Open the bath (take 100 L as an example): add the required amount of FF-5130M (40 L) into the bath, and then add the required amount of copper sulfate pentahydrate (3 kg), after it is completely dissolved, add the required amount of FF-5130RS (25 L), mix well, adjust pH to 10.8 with 20% KOH or 20% H2SO4, and filter continuously with cotton wick.
Note: The water used to open the bath must be pure water.
4. Bath control and maintenance
4.1 pH value: use a pH meter to test and control the pH value to 10.5-11.0; use 20% KOH solution or 20% H2SO4 solution to adjust.
Note: In the early stage of opening the bath, the accumulation of carbonate will cause the pH to fluctuate, so it needs to be adjusted frequently!
4.2 Copper ion concentration: use titration analysis, adjust the anode area or add copper salt.
Note: The pH value needs to be adjusted after adding copper salt.
4.3 Normal supplement: FF-5130M (1～2 L/KAh), FF-5130RS (6～7 L/KAh)
4.4 Sn content correction: The allowable range of tin salt concentration in the plating solution is very wide, and it can be supplemented normally. After long-term use of the plating solution, the Hastelloy sheet is refined and corrected. When the Hastelloy sheet is reddish, 20-30 ml/L FF-5130RS should be added.
Note: After supplementing with FF-5130RS, the pH may increase and need to be adjusted!
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