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Activation solution for aluminium alloy before chemical nickel plating

A technology for electroless nickel and aluminum alloy plating, which is used in the field of activation solution of aluminum alloys before electroless nickel plating, can solve problems such as affecting the adhesion and protection of the coating.

Inactive Publication Date: 2003-06-25
中国航天科技集团公司第九研究院七七一研究所
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional pre-plating treatment of aluminum alloy is a secondary zinc dipping process. Due to the large potential difference between the zinc and the nickel-phosphorus alloy coating, the bonding force and protection of the coating are affected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare 1 liter of activation solution: first dissolve the weighed 220g of sodium hydroxide with an appropriate amount of pure water, then add the weighed 30g of zinc oxide into it, stir while adding, so that the zinc oxide is fully dissolved; then use an appropriate amount of 50-60°C Dissolve 3g of iron trichloride, 30g of nickel sulfate, and 50g of potassium sodium tartrate in pure water respectively, and add ferric chloride and nickel sulfate solutions into the solution of potassium sodium tartrate respectively; finally mix the potassium sodium tartrate The solution is added to the mixed solution of sodium hydroxide and zinc oxide, and can be used after careful filtration. When in use, the temperature is controlled at 38°C, and the activation time is 80s

Embodiment 2

[0016] Prepare 200 liters of activation solution: firstly dissolve the weighed 44kg of sodium hydroxide with an appropriate amount of pure water, then add the weighed 6kg of zinc oxide into it, and stir while adding to fully dissolve the zinc oxide; then use an appropriate amount of 50-60°C Dissolve 0.6 kg of ferric chloride, 6 kg of nickel sulfate, and 10 kg of potassium sodium tartrate in pure water, respectively, and add the ferric chloride and nickel sulfate solutions into the potassium sodium tartrate solution; finally, the mixed potassium tartrate Sodium solution is added to the mixed solution of sodium hydroxide and zinc oxide, and it can be used after careful filtration. When in use, the temperature is controlled at 45°C, and the activation time is 120s

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Abstract

Of the aluminum alloy activating solution, each liter contains zinc oxide 10-50 g, sodium hydroxide 100-300g, nickel sulfate 20-50 g, ferric trichloride 2-5 g and potassium-sodium tartrate 20-50 g. It is used int reating aluminium alloy before nickel plating at 30-50 deg.c for 20-200 sec. The treatment can lower the potential difference between the activated layer and the plated layer, raise the activity of the aluminum alloy surface, reduce the pollution to plating liquid, raise the binding force and protecting function of the plated layer, increase the service life of chemical nickel plating solution and reduce chemical nickel plating cost.

Description

technical field [0001] The invention relates to an activation solution for aluminum alloys before electroless nickel plating. Background technique [0002] The traditional pre-plating treatment of aluminum alloys is a secondary zinc immersion process. Due to the large potential difference between the zinc and nickel-phosphorus alloy coatings, the bonding force and protective properties of the coatings are affected. Contents of the invention [0003] The purpose of the present invention is to provide an activation solution with little pollution and long service life. [0004] The technical scheme that realizes the object of the present invention is that the weight of substance contained in every liter of activation solution is: [0005] Zinc oxide 10-50g [0006] Sodium hydroxide 100-300g [0007] Nickel sulfate 20-50g [0008] Ferric chloride 2-5g [0009] Potassium sodium tartrate 20-50g When using the activation solution, the temperature is controlled at 30-50°C, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/32
Inventor 蒙铁桥杨胜利
Owner 中国航天科技集团公司第九研究院七七一研究所
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