The FF-7805 cyanide free silver plating process is an environmentally friendly functional silver plating process. It can be widely used in various industries such as electrical appliances, high-voltage electrical, electronic, communication equipment and instruments, aerospace, etc.
1 Characteristics and Scope of Application
1.1 The plating solution is very stable and easy to control; The plating solution has high current efficiency, good dispersion and coverage ability, and excellent weldability and anti discoloration ability of the coating;
1.2 The plating solution is a cyanide free formula, which eliminates the potential danger of personal safety accidents caused by cyanide and greatly reduces environmental pollution.
2.1 Process flow: Pre treatment → Water washing → Activation → Water washing → Pre silver plating → Silver plating → Recycling → Water washing → Silver layer adjustment treatment → Water washing → Water washing → Anti discoloration treatment.
2.2 Cylinder opening materials:
FF-7805： Cyanide free silver plating pre plating solution;
FF-7805M： Cyanide free silver plating opening agent;
FF-7805A： Cyanide free silver plating additive;
FF-7805B: Cyanide free silver plating additive;
3 Solution composition and process parameters
3.1 Pre silver plating and its composition:
|
Composition of plating solution |
Standard(ml/L) |
Range(ml/L) |
|
Silver Nitrate |
5g |
3-8g |
|
FF-7805 pre-plating of silver |
300 |
250-350 |
|
Pure water |
700 |
The remaining water |
Operating conditions
|
Item |
Standard |
Range |
|
pH |
10-11 |
9.5-11.5 |
|
Temperature |
25-28℃ |
20-30℃ |
|
Jk cathode current density |
0.5A/dm2 |
0.3-2A/dm2 |
|
Cathode/anode ratio |
1: 2 |
1: 2 ~ 4 |
|
Cathode movement or air agitation |
3~4m/min |
3~4m/min |
|
Filter |
Continuous |
Continuous |
|
Note: 1. Increasing the AgNO3 content and bath temperature within the process range can increase the current density. 2. The silver plating time depends on the silver layer thickness requirements of each product and the production environment and facilities.
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