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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

Active Publication Date: 2010-05-05
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the concentration of the electroless plating solution at the entrance, the concentration of the plating solution changes as its deposition occurs, and the uniformity of the composition of the plating solution in the middle cannot be guaranteed, resulting in uneven thickness of the plating layer.
In addition, if larger plating tank heating equipment is required for longer pipes, the composition gradient of the plating solution cannot be completely eliminated, which will make the thickness of the plating layer inconsistent, which is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The present invention relates to a partial chemical plating long tube whole or partial surface method used for raising inner bore surface coating uniformity and workpiece service life. Said method includes 1, adopts plating solution trough having electroless plating liquid, plating solution drive unit, connecting chemical plating long tube to form loop through pipe and valve; 2, starting up plating solution drive unit to fill chemical plating liquid in long tube simultaneously adopting heater relatively moving outside long tube to heat chemical plating liquid in long tube, making chemical plating to long tube inner surface; 3, continue circulation using chemical plating liquid back flown to plating solution trough until long tube inner surface whole or partial chemical plating ending. Heater and workpiece relatively move at 0.1-500mm / min speed; chemical plating liquid continuously pass through workpiece inner bore at 0-500mm / s speed.

Description

technical field [0001] The invention relates to a method for locally chemically plating the surface of a long tube, which is a method for locally chemically plating all or part of the inner and outer surfaces of a long tube, and belongs to the technical field of chemical plating and anti-corrosion. Background technique [0002] Due to the limitation of the size of the plating tank in the traditional electroless plating process, the long tube cannot be chemically cleaned and electroless plated. Even if the size of the plating tank is large enough, it is difficult to ensure the circulation of the plating solution in the tube after the long tube reaches a certain length, which will affect the quality and uniformity of the coating in the inner hole. [0003] JP63195279 discloses a method for first cleaning the inner hole of a workpiece, and then introducing an electroless plating solution for electroless plating. In this method, the electroless plating solution flows through th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/00C23C18/02C23C18/31C23C18/08
Inventor 王林山张小勇楚建新李永丰吕宏康志君林晨光
Owner GRIMAT ENG INST CO LTD
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