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Method capable of improving activity of nickel coating on surface of copper sheet

A technology of nickel plating and copper sheet, which is applied in the direction of coating, liquid chemical plating, metal material coating process, etc., and can solve problems such as unstable quality and poor performance of conductive joints

Active Publication Date: 2017-08-01
XIAN AIRCRAFT IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In actual production, the performance of the conductive joint is judged by the aluminum-copper stripping method and the voltage drop test method. After the nickel coating is used, the initial production problem is solved, but the performance of the conductive joint is good and bad, and the quality is not stable.

Method used

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  • Method capable of improving activity of nickel coating on surface of copper sheet

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Embodiment Construction

[0012] Adopt a kind of method that can increase the activity of nickel coating on copper sheet surface in actual production, comprise the following steps:

[0013] 1) Alkali boiling to remove oil: Prepare the lye tank, string the copper sheets with stainless steel wires and put them in hot alkali solution to boil for 1-2 minutes. After the alkali is released, immerse the copper sheets in hot water for rinsing. Rinse the sheet with normal temperature tap water for the second and third times until the residual lye on the surface of the copper sheet is rinsed clean;

[0014] 2) Pickling: prepare the acid tank, gently put the degreased copper sheet into the mixed acid solution of hydrochloric acid and hydrofluoric acid for pickling, the pickling time is between 10s and 30s, after the pickling is completed, put the The copper sheet is immersed in hot water for rinsing, and then the copper sheet is rinsed with normal temperature tap water for the second and third times until the res...

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Abstract

The invention provides a method capable of improving activity of a nickel coating on the surface of a copper sheet, and mainly relates to a technological method for plating a nickel layer on the surface of the red copper sheet during production of copper-aluminium bimetallic cathode conductive contacts. The method comprises the steps of carrying out soda boiling for degreasing; carrying out acid pickling; carrying out surface coating on the copper sheet with a NaF solution of which the concentration is 45% to 60%; and carrying out dehydrogenation. According to the method, the copper sheet is coated through a Na<+> saline solution, so that effective bonding of molten aluminum and the nickel coating of the copper sheet is effectively controlled, and the nickel coating can meet mechanical properties and electrical properties of the conductive contacts.

Description

technical field [0001] The invention relates to a method for increasing the activity of the nickel plating layer on the surface of copper sheets, in particular to the solution coating and pretreatment process for the nickel plating layer on the surface of copper sheets in the production of a copper-aluminum bimetallic cathode conductive joint. Background technique [0002] When manufacturing conductive parts of electromechanical equipment, most of them use aluminum and copper welding. In the equipment for extracting metal zinc by electrolysis, the cathode in the electrolysis is made of pure aluminum plate, and the anode is made of pure copper plate. According to the requirements of use, the joints of the two must be connected with aluminum and copper bimetallic cathode conductive joints, except for aluminum and copper. In addition to good welding, and the distance between the end of the copper sheet and the aluminum block is 90mm, the voltage drop should meet the requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16C23C18/32C23C18/18
CPCB22D19/0081B22D19/16C23C18/1844C23C18/32
Inventor 刘焕文朱增辉杨翠
Owner XIAN AIRCRAFT IND GROUP
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