Process for local chemical plating long pipe surface
A local chemical and electroless plating technology, which is applied to all or part of the outer surface, the surface of the local chemical plating long tube, and the inner field of the local chemical plating long tube. It can solve the problem that the gradient of the plating solution cannot be completely eliminated, and the composition of the plating solution cannot be guaranteed uniform problems such as non-uniformity and coating thickness, etc., to achieve the effect of easy automatic operation, low cost, and uniform coating thickness
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Embodiment 1
[0046] An aluminum tube with a diameter of 3.0mm and a length of 3m is used as the blank, and after degreasing, pickling, and zinc dipping treatment, the electroless nickel-phosphorus alloy is plated. Alkaline nickel-phosphorus pre-plating is performed first, and then acidic electroless nickel-phosphorus alloy plating is performed. The formula and process of the mature electroless plating solution are as follows:
[0047] Alkaline bath:
[0048] NiSO 4 ·6H 2 O 30g / L
[0049] NaH 2 PO 2 ·H 2 O 10g / L
[0050] Sodium citrate 100g / L
[0051] Ammonium chloride 50g / L
[0052] The pH value is 8.5-9.5, the temperature is 40-45°C, and the time is 5 minutes;
[0053] Acid bath:
[0054] NiSO 4 ·6H 2 O 25g / L
[0055] NaH 2 PO 2 ·H 2 O 24g / L
[0056] Lactic acid 25ml / L
[0057] Boric acid 20g / L
[0058] The pH value is 4.5-5.0, the temperature is 80-95°C, the time is 60 minutes, the flow rate of the plating solution is 5-10mm / s, and the relative moving speed between th...
Embodiment 2
[0065] Use a pure aluminum special-shaped tube with a diameter of 3.0mm and a length of 12m as the blank instead of the 3m long aluminum tube in Example 1, the flow rate of the plating solution is 15-30mm / s, and the rest are carried out according to the conditions in Example 1. Cut the 12m long pipe into 20 sections, the thickness of the coating is measured to be 15±1μm, and there is a uniform coating on the surface of the inner hole.
Embodiment 3
[0067] Use a pure aluminum special-shaped tube with a diameter of 5.0 mm and a length of 1 m as the blank instead of the 3 m long aluminum tube in Example 1, the flow rate of the plating solution is 500 mm / s, and the rest are carried out according to the conditions in Example 1. Cut the 1m-long pipe into 4 sections, the thickness of the coating is measured to be 3±0.5μm, and there is a uniform coating on the surface of the inner hole.
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