Anti-nitridation process for copper-tin composite plating
A nitriding and copper-tin technology, which is applied in the field of metal surface treatment to prevent nitriding, carbon, and cyanide, can solve the problems of copper consumption and copper removal, long time consumption of copper removal, high cost of sewage treatment, etc., and achieve energy saving The effect of increasing the amount of copper, improving the plating efficiency, and reducing the plating time
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Embodiment 1
[0018] In order to make the workpiece achieve the purpose of anti-nitriding, the following steps can be used when electroplating copper to the workpiece:
[0019] 1. Hanging
[0020] 2. Degreasing
[0021] 3. Wash with hot water
[0022] 4. Rinse with cold water
[0023] 5. Weak corrosion
[0024] Sulfuric acid (H 2 SO 4 Density 1.84) Industrial grade 150-200g / L
[0025] temperature room temperature
[0026] Time 0.1-2min
[0027] 6. Rinse with cold water
[0028] 7. Anode cleaning
[0029] Sulfuric acid (H 2 SO 4 Density 1.84) Industrial grade 500-600g / L
[0030] temperature room temperature
[0031] Time 30-60S
[0032] Current density 50-10 A / dm 2
[0033] Note: (1) Stainless steel, high-strength steel, heat-resistant steel, and high-temperature alloy steel need to carry out this process to improve the bonding force of the coating.
[0034] ⑵ After anode cleaning, the workpiece needs to be charged out of the tank.
[0035] 8. Rinse with cold wat...
example 1
[0062] Insoluble anode 304 or 314 stainless steel (cathode to anode ratio 1:1.5)
[0063] Note: ⑴ The bath is stirred with clean compressed air. During copper plating, the bath solution is continuously circulated and filtered.
[0064] (2) When copper-plating nitriding parts, the position of the workpiece should be changed 3 times by 90°. To ensure the uniformity of the coating.
[0065] 14. Flowing cold water wash
[0066] This process needs to be carefully cleaned with grade 2 deionized water and then transferred to the tin plating tank.
[0067] 15. Dark tin plating 5~8um
[0068] Stannous sulfate (SnSO4) chemically pure 15~25g / L
[0069] Sulfuric acid industrial grade 8~12%
[0070] Additive (LD-7720) Industrial grade 10~20ml / L
[0071] Temperature 15~25℃
[0072] Cathode current density 1~4A / dm 2
[0073] time 6 minutes
[0074] 16. Flowing cold water wash
[0075] 17. Stabilization treatment
[0076] Put the copper-tin-plated workpiece into a closed heat pre...
Embodiment 2
[0078] In order to make the workpiece achieve the purpose of anti-nitriding, the following steps can be used when electroplating copper to the workpiece:
[0079] 1. Hanging
[0080] 2. Degreasing
[0081] 3. Wash with hot water
[0082] 4. Rinse with cold water
[0083] 5. Weak corrosion
[0084] Sulfuric acid (H 2 SO 4 Density 1.84) Industrial grade 150-200g / L
[0085] temperature room temperature
[0086] Time 0.1-2min
[0087] 6. Rinse with cold water
[0088] 7. Anode cleaning
[0089] Sulfuric acid (H 2 SO 4 Density 1.84) Industrial grade 500-600g / L
[0090] temperature room temperature
[0091] Time 30-60S
[0092] Current density 50-10 A / dm 2
[0093] Note: (1) Stainless steel, high-strength steel, heat-resistant steel, and high-temperature alloy steel need to carry out this process to improve the bonding force of the coating.
[0094] ⑵ After anode cleaning, the workpiece needs to be charged out of the tank.
[0095] 8. Rinse with cold wat...
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