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Method for directly electroplating lead on surface of aluminium and aluminium alloy

A technology for aluminum alloy surfaces and aluminum alloys, which is applied in the field of direct electroplating lead on aluminum and aluminum alloy surfaces, can solve the problems of poor adhesion of coatings, high production costs, difficult quality control, etc., and achieve good adhesion and high yield , The effect of easy product quality

Inactive Publication Date: 2009-12-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a direct electroplating of lead on the surface of aluminum and aluminum alloys to solve the shortcomings of the existing aluminum and aluminum alloy electroplating technology, such as the need to coat the intermediate layer, cumbersome steps, difficult quality control, poor coating adhesion, and high production costs. The method, this method does not need to plate any intermediate metal coating, the steps are simple, the coating has good bonding force, and the cost is low

Method used

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  • Method for directly electroplating lead on surface of aluminium and aluminium alloy
  • Method for directly electroplating lead on surface of aluminium and aluminium alloy
  • Method for directly electroplating lead on surface of aluminium and aluminium alloy

Examples

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Effect test

Embodiment 1

[0026] Direct electroplating of lead on pure aluminum

[0027] The sample is made of L3 industrial pure aluminum, and the specific steps are as follows:

[0028] 1. Pre-plating treatment. After the pure aluminum plate is cut according to the requirements, it undergoes a series of treatments such as mechanical grinding → degreasing → alkali etching → electrocleaning → activation → pickling. Metallographic sandpaper dipped in water is used for mechanical grinding; traditional aluminum degreasing agent is used for degreasing; after that, the pure aluminum plate is subjected to alkaline etching treatment in alkaline etching solution at 40°C, and the composition of alkaline etching solution is 30g of sodium hydroxide / L, alkali corrosion additive sodium carbonate 5g / L, etching time 30 seconds; then put the pure aluminum plate in the electrocleaning liquid for treatment at room temperature, the composition of the electrocleaning liquid is sodium bicarbonate 10g / L, electrocleaning a...

Embodiment 2

[0038] Direct electroplating of lead on pure aluminum

[0039] The sample is made of L3 industrial pure aluminum, and the specific steps are as follows:

[0040] 1. Pre-plating treatment. After the pure aluminum plate is cut according to the requirements, it undergoes a series of treatments such as mechanical grinding→oil removal→alkali corrosion→electrocleaning→activation→pickling; the mechanical grinding and degreasing treatment are carried out in the same way as in Example 1; after that, the pure aluminum plate Carry out alkaline etching treatment in alkaline etching solution at 45°C. The composition of alkaline etching solution is to etch for 50 seconds in alkaline etching solution with sodium hydroxide content of 35g / L and alkali etching additive sodium chloride 8g / L; then The pure aluminum plate is placed in the electric cleaning solution at room temperature for treatment. The composition of the electric cleaning solution is sodium bicarbonate 15g / L, and the electric cl...

Embodiment 3

[0050] Direct electroplating of lead on pure aluminum

[0051] The sample is made of L3 industrial pure aluminum, and the specific steps are as follows:

[0052] 1. Pre-plating treatment. After the pure aluminum plate is cut according to the requirements, it undergoes a series of treatments such as mechanical grinding → degreasing → alkali etching → electrocleaning → activation → pickling. Mechanical grinding and degreasing are carried out in the same manner as in Example 1; then the pure aluminum plate is etched at 50°C in an alkaline etching solution with a sodium hydroxide content of 40g / L and an alkaline etching additive sodium phosphate of 10g / L 100 seconds; then put the pure aluminum plate at room temperature in the electro-cleaning solution with a sodium bicarbonate content of 20g / L and the electro-cleaning additive sodium chloride 10g / L with 18V DC for 180 seconds; then put the pure aluminum plate in sulfuric acid The content is 100ml / L, and the activation additive n...

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Abstract

The invention relates to a method for directly electroplating lead on the surface of aluminium and aluminium alloy, comprising the following procedures of mechanical grinding, oiling removing, alkaline degreasing, acid pickling and lead plating. The method is characterized by also comprising the procedures of electric purification and activation between the procedures of alkaline degreasing and acid pickling. The method comprises the following steps: directly electroplating lead on the surface of aluminium and aluminium alloy, and having no need of plating a metal transitional layer, such as zinc dipping, copper preplating, nickel preplating and the like; putting the aluminium and the aluminium alloy with treated surfaces into plating solution for plating, adding a refining agent, a stabilizing agent and an anti-hydrogen agent in the electroplating solution, and adopting direct current for electroplating. The current density is 0.5 to 2A / dm, and the obtained plating layer is even and compact and has smooth surfaces without foaming and shell phenomenon and has good binding force. The method overcomes the defects that the traditional lead electroplating on the surface of aluminium and aluminium alloy needs to plate the metal transitional layer, has trivial steps, rough surface, easy foaming, difficult quality control and poor binding force of plating layer and the like.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a method for directly electroplating lead on the surface of aluminum and aluminum alloys. Background technique [0002] Aluminum and its alloys can be endowed with protection, decoration and other functional uses after electroplating, which can prolong the service life and expand the application range. [0003] Electroplating on aluminum and its alloys is much more difficult than electroplating on other metals, mainly because of peeling and peeling between the coating and the substrate, and poor bonding. One of the main reasons is that a large amount of hydrogen gas is precipitated during aluminum-based electroplating, which is easy to bubble, which makes the bonding between the coating and the aluminum-based substrate worse, and the surface is rough and deformed seriously. [0004] At present, aluminum and aluminum alloy electroplating mainly adopt special pretreatment m...

Claims

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Application Information

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IPC IPC(8): C25D5/44C25D3/34
Inventor 郭忠诚杨志鸿黄惠祝星
Owner KUNMING UNIV OF SCI & TECH
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