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Cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings and preparation method and electroplating method thereof

A cyanide-free alkaline copper plating and electroplating solution technology, which is applied in the direction of improving process efficiency, can solve the problems of low copper plating speed, overcome the poor bonding force, solve the technical problem of slow copper plating speed, and reduce copper plating. The effect of ionic potential

Inactive Publication Date: 2021-07-23
张志梁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the technical problem of low copper plating speed for most cyanide-free alkali copper

Method used

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  • Cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings and preparation method and electroplating method thereof
  • Cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings and preparation method and electroplating method thereof
  • Cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings and preparation method and electroplating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings, each component and content are as table 1;

[0035] The preparation method of the electroplating solution includes the following steps: adding 1 / 2 volume of pure water into the container; adding the complex composition, stirring until dissolved; adding copper salt under stirring, heating to 80°C and stirring to promote A copper complex is formed, and then the complex adsorbent is added and stirred to dissolve. Add the remaining pure water to the working volume and stir evenly, and adjust the pH to 10 with potassium hydroxide to implement electroplating.

[0036] Table 1 is the electroplating solution composition of embodiment 1:

[0037]

[0038]

[0039] Electroplating method: Zinc alloy die castings are degreased and activated in sequence, then placed in the electroplating tank for electroplating, and the current density is set to 2A / dm 2 , Electroplating at roo...

Embodiment 2

[0045] A kind of cyanide-free alkaline copper-plating electroplating solution for zinc alloy die-casting parts, each component and content are as table 2;

[0046] The preparation method of the electroplating solution comprises the following steps: adding a calculated amount of 1 / 2 volume of pure water into the container; adding the complex composition, stirring until dissolved; adding copper salt under stirring, heating to 80°C and stirring to promote A copper complex is formed, and then the complex adsorbent is added and stirred to dissolve. Add the remaining pure water to the working volume and stir evenly, and adjust the pH to 11 with potassium hydroxide to implement electroplating.

[0047] Table 2 is the electroplating solution of embodiment 2:

[0048]

[0049]

[0050] Electroplating method: Zinc alloy die castings are degreased and activated in sequence, then placed in the electroplating tank for electroplating, and the current density is set to 5A / dm 2 , Elec...

Embodiment 3

[0056] A kind of cyanide-free alkaline copper-plating electroplating solution for zinc alloy die-casting parts, each component and content are as table 3;

[0057] The preparation method of the electroplating solution comprises the following steps: adding a calculated amount of 1 / 2 volume of pure water into the container; adding the complex composition, stirring until dissolved; adding copper salt under stirring, heating to 80°C and stirring to promote A copper complex is formed, and then the complex adsorbent is added and stirred to dissolve. Add the remaining pure water to the working volume and stir evenly, and adjust the pH to 9 with potassium hydroxide to implement electroplating.

[0058] Table 3 is the electroplating solution of embodiment 3:

[0059]

[0060]

[0061] Electroplating method: Zinc alloy die castings are degreased and activated in sequence, then placed in the electroplating tank for electroplating, and the current density is set to 5A / dm 2 , Elect...

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Abstract

The invention discloses a cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings and a preparation method and an electroplating method thereof. The cyanide-free alkaline copper plating electroplating solution is prepared from the following components of 5-50g / L of main salt, 5-30g / L of a compound adsorbent and 200-400g / L of a complexing composition. By adding the compound adsorbent to change the copper ion concentration in a double electrode layer on a cathode surface, the cathode interface copper ion potential can be effectively reduced, the copper ion discharging precipitation is inhibited, the 'zinc-copper replacement reaction' is completely inhibited in the alkaline plating solution, the complexing effect with the complexing composition is synergistic, the effect that 1 + 1 is greater than 2 is generated, the copper ion concentration in the double electrode layer is changed, and the copper ion potential is effectively reduced, so that copper ion discharging is more difficult; the 'zinc-copper replacement reaction' is completely inhibited in the alkaline plating solution, the technical problems that cyanide-free copper plating binding force of the zinc alloy die castings is poor and bubbling is prone to occurring are solved, and plating layers are bright and fine in crystal and firm in binding force.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a cyanide-free alkaline copper plating electroplating solution for zinc alloy die castings, a preparation method thereof and an electroplating method. Background technique [0002] Zinc alloy die castings are amphoteric metals, the electrode potential is relatively negative, often contains about 3% aluminum, and the chemical stability is poor. In the pretreatment process, zinc dipping treatment is not carried out, the driving force of the displacement reaction is large and it is difficult to suppress, and the requirements for the cyanide-free copper plating process are higher, which has become the biggest bottleneck in the electroplating industry to completely replace the cyanide copper plating. In order to obtain a good coating bonding force, the direct copper plating on zinc alloy die castings at home and abroad is currently using an alkaline and highly toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/38
CPCC25D3/38Y02P10/20
Inventor 张志梁
Owner 张志梁
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