Simple and easy-to-operate aluminum alloy surface chemical nickel plating pretreatment process

An aluminum alloy surface, electroless nickel plating technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the complicated and cumbersome problems of secondary zinc immersion treatment, and achieve low cost, high efficiency, and applicable wide range of effects

Active Publication Date: 2021-09-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the purpose of the present invention is to provide a simple and easy-to-operate pretreatment process for electroless nickel plating on the surface of aluminum alloys, which can quickly form a thin uniform loose product film to ensure that the aluminum alloy substrate is placed in the electroless plating solution, and the plating The liquid components are easy to penetrate the product film, and when they reach the substrate, a displacement reaction occurs, which realizes the uniform deposition and growth of the coating, and solves the complicated and tedious problem of the pre-treatment of the second galvanizing

Method used

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  • Simple and easy-to-operate aluminum alloy surface chemical nickel plating pretreatment process
  • Simple and easy-to-operate aluminum alloy surface chemical nickel plating pretreatment process
  • Simple and easy-to-operate aluminum alloy surface chemical nickel plating pretreatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, the sample is a deformed 6061 aluminum alloy, and the specific steps are as follows:

[0034] 1) Degreasing: Use alcohol to degrease the surface of the sample, soak at 25°C for 5 minutes;

[0035] 2) Activation: The activation treatment solution is potassium phosphate 30g / L, sodium carbonate 25g / L, malic acid 1.5g / L, magnesium chloride 2g / L, ethylene bisstearamide (EBS) 1g / L, sodium nitrite ( NaNO 2 ) 2g / L, sodium dodecylbenzene sulfonate 2g / L aqueous solution, the pH value is 10, place the sample in the activation treatment solution, soak at 25°C for 3min;

[0036]3) Electroless nickel plating: The electroless nickel plating solution is an aqueous solution of nickel sulfate 20g / L, sodium hypophosphite 20g / L, potassium acetate 30g / L, potassium citrate 10g / L, copper sulfate 40mg / L, and thiourea 4g / L , the pH value is 5.4, the sample is placed in the electroless nickel plating solution, soaked at 80°C for 1h. The nickel-phosphorus coating prepared b...

Embodiment 2

[0038] In this embodiment, the sample is a deformed 6061 aluminum alloy, and the specific steps are as follows:

[0039] 1) Degreasing: Use alcohol to degrease the surface of the sample, soak at 30°C for 10 minutes;

[0040] 2) Activation: The activation treatment solution is sodium phosphate 20g / L, potassium carbonate 25g / L, lactic acid 1g / L, magnesium oxide 1g / L, ethylene bisstearamide (EBS) 2g / L, sodium hexametaphosphate 2g / L, potassium silicate 5g / L, glycerin fatty acid 3g / L aqueous solution, pH value is 9.5, place the sample in the activation treatment solution, soak at 30°C for 4min;

[0041] 3) Electroless nickel plating: The electroless nickel plating solution is nickel sulfate 30g / L, sodium hypophosphite 20g / L, sodium acetate 30g / L, sodium citrate 20g / L, sodium saccharin 40mg / L, 1,4 butynediol 10mg / L, thiourea 2g / L aqueous solution, the pH value is 5.6, place the sample in the electroless nickel plating solution, soak for 1h at 80°C. The nickel-phosphorous coating ...

Embodiment 3

[0043] In this embodiment, the sample is extruded 2024 aluminum alloy, and its specific steps are as follows:

[0044] 1) Degreasing: Use alcohol to degrease the surface of the sample, soak at 25°C for 8 minutes;

[0045] 2) Activation: The activation treatment liquid is sodium phosphate 15g / L, sodium carbonate 30g / L, salicylic acid 1g / / L, cadmium chloride 2g / L, monoglyceride stearate (GMS) 2g / L, silicic acid Sodium 1g / L, glycerin fatty acid 3g / L aqueous solution, pH value is 9, place the sample in the activation treatment solution, soak at 25°C for 5min;

[0046] 3) Electroless nickel plating: The electroless nickel plating solution is basic nickel carbonate 10g / L, sodium hypophosphite 20g / L, sodium acetate 30g / L, potassium citrate 10g / L, copper sulfate 60mg / L, thiourea 3g / L Aqueous solution, pH value is 5.4, the sample is placed in the electroless nickel plating solution, soaked for 1.5h at 85°C. The nickel-phosphorus coating prepared by this method is silver-colored and h...

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Abstract

The invention relates to the field of aluminum alloy surface treatment, in particular to a simple and easy-to-operate aluminum alloy surface chemical nickel plating pretreatment process. An activating treatment solution comprises 10-30 g/L of phosphate, 20-40 g/L of carbonate, 1-5 g/L of organic acid and salt thereof, 1-5 g/L of stabilizers, 1-5 g/L of dispersing agents, 1-10 g/L of corrosion inhibitors, 1-4 g/L of surfactants, and the balance of water. The method comprises the following steps that firstly, an aluminum alloy base material subjected to oil removal is soaked in the activating treatment solution for 1-10 minutes, oxide skin, dirt and the like on the surface of an aluminum alloy are removed at normal temperature, and the surface roughness and the surface activity of the base material are increased; and then the base material is put in a chemical plating solution for plating, the binding force of an obtained nickel-phosphorus coating and a matrix is less than or equal to grade 1, and the binding force of the nickel-phosphorus coating is equivalent to that of a nickel-plated layer obtained by a traditional secondary zinc immersion process. The technology is very simple in process, convenient to operate, low in cost and less in environmental pollution compared with a traditional technology, and is a novel more environment-friendly surface treatment method.

Description

technical field [0001] The invention relates to the field of surface treatment of aluminum alloys, in particular to a simple and easy-to-operate pretreatment process for electroless nickel plating on the surface of aluminum alloys. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific stiffness and specific strength, good electrical and thermal conductivity, good casting performance and processing performance, and is widely used in aerospace, transportation and other fields. Among them, electroless nickel plating technology is one of the commonly used surface modification technologies for aluminum and aluminum alloys. It can form a conductive nickel-phosphorus coating, endow aluminum alloys with additional functionality, meet the needs of some special conditions, and improve the hardness and hardness of aluminum alloys. abrasion resistance. As a metal with relatively active chemical properties, aluminum has a strong affinity with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/32C23C18/18
CPCC23C18/36C23C18/32C23C18/1844
Inventor 宋影伟马善智董凯辉韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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