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Pre-galvanizing process for electroplating copper on surface of magnesium alloy shell

A magnesium alloy, pre-galvanized technology, applied in the field of electroplating, to achieve the effect of good bonding force, low porosity, excellent throwing ability and deep plating ability

Inactive Publication Date: 2014-07-02
无锡市锡山区鹅湖镇荡口青荡金属制品厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uniformity, flatness and bonding force with the metal substrate of the electroplating copper coating in the above-mentioned processes are not very ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A pre-galvanizing process for electroplating copper on the surface of a magnesium alloy shell, said process comprising the steps of:

[0020] 1) Cleaning: Under the condition of 65-75 ℃, soak the magnesium alloy casting in the alkali washing solution for 8 minutes. The composition of the alkali solution is sodium hydroxide 74g / L, sodium phosphate 8g / L, the balance is water, and then wash with water; Under the condition of 35-45°C, soak the magnesium alloy casting in tartaric acid for 60s, and then wash it with water;

[0021] 2) Activation: Activate the magnesium alloy castings in the activator for 5-15 minutes at room temperature, and then wash with water; the activation solution consists of citric acid 165g / L, NaF210g / L, and the balance is water;

[0022] 3) Zinc dipping alloy: the composition of the dipping zinc solution is: ZnSO 4 ·7H 2 O32g / L, Na 4 P 2 o 7 10H 2 O170g / L, NaF10g / L, KF8g / L, NaF 2 CO 3 8g / L, NiSO 4 3g / L, phosphoric acid 15g / L, and water as th...

Embodiment 2

[0025] A pre-galvanizing process for electroplating copper on the surface of a magnesium alloy shell, said process comprising the steps of:

[0026] 1) Cleaning: Under the condition of 65-75°C, soak the magnesium alloy casting in the alkaline washing solution for 10 minutes. The alkaline solution is composed of sodium hydroxide 76g / L, sodium phosphate 6g / L, and the balance is water, and then wash with water; Under the condition of 35-45°C, soak the magnesium alloy casting in tartaric acid for 60s, and then wash it with water;

[0027] 2) Activation: Activate the magnesium alloy castings in the activator for 15 minutes at room temperature, and then wash with water; the activation solution consists of citric acid 175g / L, NaF 200g / L, and the balance is water;

[0028] 3) Zinc dipping alloy: the composition of the dipping zinc solution is: ZnSO 4 ·7H 2 O36g / L, Na 4 P 2 o 7 10H 2 O160g / L, NaF12g / L, KF6g / L, NaF 2 CO 3 12g / L, NiSO 4 2g / L, phosphoric acid 18g / L, and water as ...

Embodiment 3

[0031] A pre-galvanizing process for electroplating copper on the surface of a magnesium alloy shell, said process comprising the steps of:

[0032] 1) Cleaning: Under the condition of 65-75 ℃, soak the magnesium alloy casting in the alkali washing solution for 9 minutes. The composition of the alkali solution is sodium hydroxide 75g / L, sodium phosphate 7g / L, the balance is water, and then wash with water; Under the condition of 35-45°C, soak the magnesium alloy casting in tartaric acid for 50s, and then wash it with water;

[0033] 2) Activation: Activate the magnesium alloy casting in the activator for 10 minutes at room temperature, and then wash with water; the activation solution consists of citric acid 170g / L, NaF205g / L, and the balance is water;

[0034] 3) Zinc dipping alloy: the composition of the dipping zinc solution is: ZnSO 4 ·7H 2 O34g / L, Na 4 P 2 o 7 10H 2 O165g / L, NaF11g / L, KF7g / L, NaF 2 CO 3 10g / L, NiSO 4 2.5g / L, phosphoric acid 17g / L, the balance is ...

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Abstract

The invention discloses a pre-galvanizing process for electroplating copper on the surface of a magnesium alloy shell. The process comprises the following steps: (1) washing: washing with alkali, water and acid; (2) activating: activating for 5-15 minutes in an activate fluid; (3) zinc-immersing alloying: immersing a magnesium alloy cast in zinc alloy immersion liquid for 10-15 minutes at 75-85 DEG C; (4) pregalvanizing, wherein the pregalvanizing fluid comprises 32-36g / L of ZnSO4.7H2O, 164-168g / L of K4P2O7.3H2O, 18-20g / L of KF, 32-36g / L of C6H17O7N3, 0.4-0.6g / L of phytic acid, 4-6g / L of H2CSNH2 and the balance of water, the pregalvanizing temperature is 35-45 DEG C, the electroplating time is 30-40 minutes, and the current density is 2-3A / dm<2>.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a pre-galvanizing process for electroplating copper on the surface of a magnesium alloy shell. Background technique [0002] The heat dissipation of magnesium alloy is not only higher than that of plastic, but also better than that of aluminum alloy. The thermal diffusivity of magnesium alloy is 3.79×10 -5 m 2 Ps, the thermal diffusivity of aluminum alloy is 3.64×10 -5 m 2 Ps, while the thermal diffusivity of engineering plastics is 0. Magnesium alloys heat and dissipate heat faster than aluminum alloys, and engineering plastics are even more incomparable. Magnesium alloy also has a high performance of shielding electromagnetic interference, which is suitable for the casing of electronic equipment, especially for the casing of laptop computers, mobile phones, PDAs, digital cameras and other products. [0003] In short, magnesium alloy has the functions of light weight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/42C25D3/22
Inventor 钱永清
Owner 无锡市锡山区鹅湖镇荡口青荡金属制品厂
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