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Method of preparing conductive anti-corrosion copper coating on aluminum alloy

A conductive anti-corrosion, aluminum alloy technology, applied in the field of preparing conductive anti-corrosion copper coating on aluminum alloy, can solve the problems of easy infiltration, corrosion at the interface, unfavorable for large-scale application, etc.

Active Publication Date: 2019-03-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after electroplating, the bonding between the copper plating layer and the aluminum alloy substrate is poor, and the interface is easy to penetrate into the corrosive medium to cause corrosion and peeling off. Therefore, the surface of the substrate often needs to be treated with zinc or nickel plating, and copper is electroplated on the surface of the zinc or nickel plating layer. to enhance its binding
This leads to more procedures in the electroplating process, which is not easy to operate and is not conducive to large-scale industrial application.

Method used

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  • Method of preparing conductive anti-corrosion copper coating on aluminum alloy
  • Method of preparing conductive anti-corrosion copper coating on aluminum alloy
  • Method of preparing conductive anti-corrosion copper coating on aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment prepares a coating that avoids galvanic corrosion of the aluminum-copper connector, and the specific preparation method includes the following steps:

[0048] Step 1, pre-grinding the aluminum alloy sample: use 70 # ~1500 # Sandpaper step by step to 1500 # Then mechanically polish with 1.5 μm and 0.5 μm diamond grinding paste in turn; at room temperature, put the sample in an ultrasonic cleaner and clean it with deionized water for 10 minutes. The average roughness Ra of the sample surface measured by a surface roughness measuring instrument was 0.0371 μm.

[0049] Step 2, chemical degreasing: chemical solution composition and concentration are as follows: sodium hydroxide 10g / L, sodium carbonate 20g / L, trisodium phosphate 20g / L, OP-10 emulsifier 1g / L; soak the sample at 55°C Degreasing in chemical solution for 3 minutes; after degreasing, rinse the sample in warm water at 40°C and then quickly put it into running water for repeated washing.

[0050]...

Embodiment 2

[0059] This embodiment prepares a coating that avoids galvanic corrosion of the aluminum-copper connector, and the specific preparation method includes the following steps:

[0060] Step 1, pre-grinding the aluminum alloy sample: use 70 # ~600 # Sandpaper step by step to 600 # , at room temperature, put the sample in an ultrasonic cleaner and wash it with deionized water for 10 min. The average roughness Ra of the sample surface measured by a surface roughness measuring instrument was 0.1404 μm.

[0061] Step 2, chemical degreasing: chemical solution components and concentrations are as follows: sodium hydroxide 15g / L, sodium carbonate 25g / L, trisodium phosphate 25g / L, OP-10 emulsifier 1g / L; Soak in water for 2 minutes to degrease; after degreasing, rinse the sample in warm water at 40°C and then quickly put it into running water for repeated rinse.

[0062] Step 3, alkali washing: the composition and concentration of the alkaline solution are as follows: sodium hydroxide ...

Embodiment 3

[0069] This embodiment prepares a coating that avoids galvanic corrosion of the aluminum-copper connector, and the specific preparation method includes the following steps:

[0070] Step 1, pre-grinding the aluminum alloy sample: use 70 # ~1500 # Sandpaper step by step to 1500 # ; At room temperature, put the sample in an ultrasonic cleaner and wash it with deionized water for 10 minutes. The average roughness Ra of the sample surface measured by a surface roughness measuring instrument was 0.0732 μm.

[0071] Step 2, chemical degreasing: the composition and concentration of the chemical solution are as follows: sodium hydroxide 20g / L, sodium carbonate 30g / L, trisodium phosphate 30g / L, OP-10 emulsifier 1g / L; Soak in water for 1.5min to degrease; after degreasing, rinse the sample in warm water at 40°C, then quickly put it into running water and rinse repeatedly.

[0072]Step 3, alkali washing: the composition and concentration of the alkaline solution are as follows: sodiu...

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Abstract

The invention provides a method of preparing a conductive anti-corrosion copper coating on aluminum alloy. The aluminum alloy is not subjected to zinc immersion or nickel plating treatment before thecopper alloy is plated with copper; the method specifically comprises the following steps that the surface of the aluminum alloy is polished until the roughness of the surface of the aluminum alloy ranges from 0.03 to 0.15 micron; chemical oil removing is carried out on the aluminum alloy by adopting a chemical solution; alkali washing is carried out on the aluminum alloy by adopting an alkaline solution; acid washing is carried out on the aluminum alloy by adopting an acidic solution; and the aluminum alloy is put into a plating solution for electroplating to obtain a copper coating; the plating solution comprises the following components of 50-70 g / L of sulfuric acid, 180-250 g / L of copper sulfate, 60-80 ppm of Cl<->, 0.01-0.1 g / L of a leveling agent, 0.01-0.06 g / L of a wetting agent, and 0.02-0.08 g / L of a brightener. According to the method, complex steps such as the zinc immersion or the nickel plating intermediate layer are omitted, a copper layer is directly electroplated on thesurface of the aluminum alloy, and the obtained coating has good bonding and corrosion resistance in a combination mode.

Description

technical field [0001] The invention relates to a method for preparing a copper coating on a metal surface, in particular to a method for preparing a conductive anti-corrosion copper coating on an aluminum alloy. Background technique [0002] In the subway power supply system, the rigid catenary is widely used because of its simple structure, easy installation and maintenance. The rigid catenary usually consists of 6061 aluminum alloy busbars and copper contact wires. However, during the use of the catenary in the southern coastal cities, due to the large amount of corrosive media in the humid air, and there is a large potential difference between the busbar made of aluminum alloy and the copper contact wire, galvanic couples are very prone to occur. Corrosion caused the power consumption of the power supply circuit composed of bus bars and copper contact wires to increase sharply and cannot be used normally; this not only brought safety hazards to the operation of the subw...

Claims

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Application Information

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IPC IPC(8): C25D3/38C25D5/44C23G1/12C23G1/22
CPCC23G1/125C23G1/22C25D3/38C25D5/44
Inventor 邢亚哲王珂冯潇王慧婷赵雪雪陈永楠
Owner CHANGAN UNIV
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