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Homogeneous electrochemical treatment method of inner surface of tubular workpiece

A treatment method and electrochemical technology, applied in the field of electrochemistry, can solve the problem of inability to prepare a coating with a uniform thickness or a uniform electrochemical treatment, and achieve the effects of optimizing the current density distribution, solving the uneven thickness and improving the uniformity.

Inactive Publication Date: 2014-07-16
SICHUAN INST OF MATERIALS & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a uniform electrochemical treatment method for the inner surface of the tubular workpiece in view of the common problem that it is impossible to prepare a uniform thickness coating or uniform electrochemical treatment when electrochemically treating the inner surface of the tubular workpiece

Method used

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  • Homogeneous electrochemical treatment method of inner surface of tubular workpiece
  • Homogeneous electrochemical treatment method of inner surface of tubular workpiece

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Such as figure 1 As shown, the copper anode is placed at the mouth of the two ends of the pipeline, and the simulation calculation is performed according to the set parameters in Table 1.

[0066] figure 1 Is the calculation model diagram of Example 1, figure 2 Is the current density distribution diagram of Example 1, image 3 It is the normalized current density distribution diagram obtained by simulation calculation in Example 1. figure 1 In the middle, the middle part is a pipe, and both sides are copper anodes.

[0067] From the calculation results of Example 1, it can be seen that when the electroplating anode is placed at the two ends of the pipeline, the current density distribution is mainly concentrated at the mouth of the pipeline. The farther away from the mouth, the smaller the current density, and the distance from the mouth is 5cm. The inner surface current density approaches zero. The normalized current density is distributed between 0 and 1, the normalized c...

Embodiment 2

[0069] A copper rod with a length of 22 cm and a diameter of 10 mm was inserted into the pipe as an anode, and the simulation calculation was performed according to the set parameters.

[0070] Figure 4 Is the calculation model diagram of Example 2, Figure 5 Is the current density distribution diagram of Example 2, Image 6 It is the normalized current density distribution diagram obtained by simulation calculation in Example 2.

[0071] It can be seen from the calculation results of Example 2 that after the electroplating anode is inserted into the pipeline, the current density distribution on the inner surface of the pipeline is significantly improved compared to Example 1, but the current density at the mouth of the electroplating pipeline is still significantly different from that in the middle of the pipeline. The current density is between 0.63 and 1, and the uniformity of coating thickness distribution is still poor.

Embodiment 3

[0073] A copper rod with a length of 2cm and a diameter of 10mm is inserted into the pipe as an anode, and it scans and moves up and down along the axis of the target pipe at a constant speed at a constant speed. The simulation calculation is carried out according to the set parameters.

[0074] Figure 7 Is the calculation model diagram of Example 3. Figure 8 Is the current density distribution diagram of Example 3, Picture 9 It is the normalized current density distribution diagram obtained by simulation calculation in Example 3.

[0075] It can be seen from the calculation results of Example 3 that during the uniform scanning movement of the anode up and down along the axis in the pipeline, the instantaneous current density distribution in the pipeline changes with the anode position, although the instantaneous current density distribution on the inner surface of the pipeline is not uniform , But after the superposition of the instantaneous current density distribution in the a...

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Abstract

The invention discloses a homogeneous electrochemical treatment method of an inner surface of a tubular workpiece, aiming at solving the general problem that a uniform-thickness coating can not be prepared or homogeneous electrochemical treatment can not be carried out when the inner surface of the tubular workpiece is subjected to electrochemical treatment currently. The method disclosed by the invention comprises the following steps that a counter electrode is inserted into the tubular workpiece, the counter electrode and the tubular workpiece are used as two poles for electrochemical treatment, the counter electrode and the tubular workpiece do relative axial motion along the axis of the tubular workpiece in the process of electrochemical treatment. The method disclosed by the invention can effectively solve the above problem, a coating with good homogeneity can be prepared on the inner surface of the tubular workpiece, and the homogeneity of the coating is improved remarkably; meanwhile, the method disclosed by the invention is simple to operate, low in equipment and low in cost, and can meet industrial production demands; meanwhile, through measures such as control of relative movement speed, arrangement of subsidiary conduit and series connection of multiple counter electrodes, the homogeneity of the coating is further improved, and the preparation requirement of super-long tubular workpiece coating can be met.

Description

Technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for surface electrochemical treatment, in particular to a method for uniform electrochemical treatment of the inner surface of a tubular workpiece. Background technique [0002] The outer conductor of the high-power input coupler adopts the inner wall of a 316L stainless steel tube. The inner wall of the 316L stainless steel tube needs to be plated with a uniform oxygen-free copper coating to meet its requirements for further improving the power transmission level of the superconducting cavity high-power input coupler. For the inner surface of through-holes in metal pipes or parts with a length-to-diameter ratio greater than 3, conventional electroplating, electrolysis and other electrochemical treatment methods cannot produce uniform thickness coatings or uniform electrochemical treatments due to uneven current density distribution , There may even be problems that there is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/04C25D7/04
Inventor 王庆富陈林法涛黄煌王晓红
Owner SICHUAN INST OF MATERIALS & TECH
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