The rolling gold plating process for stainless steel hardware (small parts) is a process with unique technical advantages and characteristics. Because of its good gold plating effect and less manpower consumption, it has a very high position in the gold plating process of small metal parts and components.
Author: Marisa
The rolling gold plating process for stainless steel hardware (small parts) is a process with unique technical advantages and characteristics. Because of its good gold plating effect and less manpower consumption, it has a very high position in the gold plating process of small metal parts and components.
The standard process is as follows:
1. Use 90g of degreasing powder per 1L, and perform vibration degreasing for more than 20 minutes at room temperature. After the above steps, perform three countercurrent tap water washes;
Notes: The vibration degreasing time depends on the amount of oil on the surface of the parts. If there is a lot of oil, if the surface of the parts cannot form a continuous water film after washing with water after 60 minutes of vibration, you can replace the degreasing liquid and perform the same operation again until it is completely removed;
2. Use 100g of degreasing powder per 1L, and perform ultrasonic degreasing at a current density of 5A/dm2 and a temperature of 60℃. After the above steps, perform three countercurrent tap water washes;
Notes: Ensure that the surface of the hardware is sufficiently hydrophilic;
3. Use 30% hydrochloric acid to activate at room temperature (60L in total) for about 3 minutes. After the above steps, perform three countercurrent tap water washes;
Notes: Replace once every 3 days, and industrial hydrochloric acid 3.4L;
4. Use 220g nickel chloride and 18g hydrochloric acid per 1L, and pre-plating nickel for 8 minutes at 23℃ and 6.5A/dm2 current density. After the above steps, perform countercurrent tap water cleaning 3 times;
Notes: Check and adjust the plating solution every 3 days;
5. Use 55ml A agent and 150ml B agent per 1L, and perform chemical nickel deposition (100L) at PH value 4.5, 90℃, PH4.2 for 20s. After the above steps, perform countercurrent tap water cleaning 3 times;
Notes: Take 5 pieces from each drum to test the nickel layer thickness to see if it meets the requirements of the drawings;
6. Use room temperature pure water for cleaning;
7. CMI900 X-Ray test, sampling needs to meet the GB2828-2003 standard level;
8. Use 1.2gAu per 1L, and perform gold plating (60L) under the conditions of pH4.2, current density 0.25, and temperature 40℃;
Notes:
① Add Au daily according to the unit plating usage multiplied by the plating quantity;
② Analyze and supplement twice a week: compare with the technical department procedure file;
9. Use pure water for 3 times of recovery at room temperature;
10. CMI900 X-Ray test, sampling needs to meet the GB2828-2003 standard level;
11. Use 100l of normal temperature city water for 3 countercurrent washing, and then use 100l of normal temperature pure water for 3 countercurrent washing;
12. Dry the workpiece for 3-5 minutes at a temperature of 100℃;
Note: During the drying process, shake the workpiece once in the first 1 minute to prevent overlap between workpieces;
13. Under the conditions of 10%gg-2 and a temperature of 40℃, seal the holes (50L) for about 10 minutes.
After all the above processes are completed, we can package and ship.