666 lead free white copper tin Stannum plating 1.high hardness 2.good corrosion proof ability 3.Soft plating 4. ROHS
666 Lead Free Nickel-free White Bronze Alloy Plating chemical
The Process features:
1. We fully use food grade raw materials, special organic substances and surfactants, absolutely without lead and toxic..
2.Plating layer is silvery, more bright than common white Cu-Sn alloy which is with lead..
3 The lead content in the plating layer can fully pass the WAL-MART required test by Niton XL3t seris amalyzers, not common white Cu-Sn alloy process can do that.
4. Operative temperature is very wide from 35°C-60°C, no need to use cooling machine, save some machine and electric charge.
5. The current efficiency is 25% higher than common white Cu-Sn alloy process which is with heavy metal. But we can get the same thickenss by reducing 20% plating time, 30% cathode current density. It improves current efficiency well and save production cost.
6. Operation range of the additives is wide. Only need to add additives for each 3-4 hour normal production, easy to maintan.
Operation condition
Range optimum
Copper metal 7~10 g/l 9g/l
Tin metal 15~19g/l 16g/l
Zinc metal 0.3~0.8g/l 0.5g/l
Potassium hydroxide 10~18g/l 15g/l
Free sodium cyanide 32~43g/l 38g/l
pH value >12 >13
temperature 35~65°C 45°C
workpiece revolve necessary
continuous filtration filter for 2~3 times for each hour
current density 0.3~4 A/dm2 1.5 A/dm2
anode graphite plate or some tin plate
EquipmentPlating bath: PP, PE temperature-resistant material
Heating: stainless steel electroprobe + thermostat control
Power source: 12V DC stabilizer (voltage and current)
Make-up Method
The following steps are make-up order( base on 1 litre bath)
1. use deionized water to clean the bath tank
2. fill 50% (by volume) deionized water, add 200 ml/l 666C make-up agent.
3.add 48g/l sodium cyanide(purity:98~99%) and 16g/l superior & industrial grade potassium hydroxide, agitate to completely dissolve.
4.add 10g/l cuprous cyanide, 38g/l 666 tin salt and 0.6g/l zinc cyanide, agitate to completely dissolve.
5.add deionized water to required volume.
6. continuous filter until bath solution become clarified and witout turbidity.
7. heat to 50°C and electrolyse for 1~2 hours.
8.add 30ml 666A brightener,15ml 666B auxiliary agent, then heat and agitate for 2~3 hours, after that you can take a trial plating.
Technical DataPlating layer
Density: 8.5g/cm3, 85mg/dm2.1mm
Hardness: 400~650Vickers
Features: bright and low porosity plating layer, wearable and corrosion resistant capability.
666 Lead Free White Copper Tin Plating Chemical
