Formula and Solution Management of Copper Plating Production Process for Welding Wire

1.Chemical plating production process formula and solution management

   Process flow: Wire laying - Vibration sand washing (hot water washing) - Water washing - Electrolytic alkali washing - Hot water washing - Electrolytic acid washing - Water washing - Activation - Copper plating - Water washing neutralization - Hot water washing - Drying - Polishing and wire winding

2. Process formula: Unit (g/l)

(1) Alkali washing (bottom tank): NaOH (flake alkali) 70-80; Na2CO3 (soda ash) 45-55

(2) Acid washing (bottom tank): H2SO4 (sulfuric acid) 180-220; DW-019 acid pickling accelerator: 10g/L

(3) Chemical plating tank:

CuSO4.5H2O (copper sulfate) 40-60, H2SO4 (sulfuric acid) 70-95; dw-035  2ml    Fe2+≤60-80g/l

(4) Activation tank: dilute sulfuric acid: 60-80g/l

(5) Neutralization tank: Soda ash, baking soda (sodium bisulfate) pH ≥ 8-9

3. Addition of stabilizer dw-035: Unit (ml/l) as per the instruction manual

4 Configuration Methods and Addition Rules

4-1 alkaline washing; Weigh each of the three drugs according to the formula requirements and evenly add them to the tank. Heat up to 90 degrees Celsius.

4-2 Acid washing: First add 2/3 volume of water to the tank, then slowly add the calculated amount of sulfuric acid into the tank (to prevent splashing and injury).

4-3 Stir the calculated amount of copper sulfate with warm water, add it to the tank after it is completely dissolved, and then add the calculated amount of sulfuric acid. Slowly add the prepared stabilizer while stirring, and let it stand for 12-24 hours for better production results.

4-4 Addition pattern: (For reference only. Short term effectiveness. Best assay)

Chemical raw materials in tanks 4-4-1 and above can be dissolved or added to their respective tanks according to the optimal concentration requirements of the formula based on daily laboratory data analysis.

4-4-2 Due to the small batch size of stabilizer added, it cannot be tested. Therefore, based on experience, it can be added daily according to the consumption of copper ions, or added in small amounts during copper removal.

2、 Process condition requirements

1. Alkali tank: temperature ≥ 85C , pay attention to the changes in current, and continuously remove surface oil stains

2. Acid tank: Temperature at room temperature, acid washing voltage of 6-8 volts, observe the change in current (sometimes adjustable to 10 volts).

3 plating tanks: Room temperature is optimal, (plating range: 15-45 ° C) Fe ²+≤ 60-80 g/L

4. Hot water washing: temperature ≥ 70C, replace once every 24 hours of production.

Drying temperature: ≤ 120 ± 10 ° C

6. Pay attention to the size of the traction polishing tool, which should not exceed the tolerance and have an ellipticity of ≤ 1 thread. Also, ensure that the pH value of the lubricating oil is below 7 (weakly acidic). Polishing tools require water cooling.

7. The driving and parking speed should be greater than 2m/s (note that if the hydrogen gas in the alkali tank does not flow smoothly, it is easy to encounter open flames and explode).

If a single coating is found to be blackened, scratched, or shiny, replace the grinding tool immediately.

After continuous production for 12 hours, the 9-layer polycrystalline mold is usually removed and polished for about 4 hours before use, which will result in a longer lifespan.

Pay attention to the level of liquid and water in each tank, especially the alkaline tank, which should be replenished daily.

11. Operators should strengthen the inspection of each slot.

Report any unresolved issues to relevant personnel in a timely manner.

Note 1; The above issues and requirements can be adjusted appropriately according to the actual situation of each factory and the different conditions of the equipment. For reference only.

Note 2; The basic parameters of the plating line are roughly as follows; (Design speed of 6 meters per second)

Mechanical degreasing 2 meters - electrolytic alkali washing 9 meters - electrolytic alkali washing 9 meters - water washing 2 meters - electrolytic acid washing 8 meters - water washing 2 meters - activation washing 6 meters - chemical plating 10 meters - water washing 2 meters - neutralization washing 2 meters - water washing 2 meters - hot water washing 4 meters - drying 8 meters - polishing and wire finishing

(A gas blowing device should be installed behind each tank to minimize the insertion of plating solution between tanks.)