Pretreatment solution used for electroless nickel-phosphorus alloy plating layer on surface of aluminum alloy

A technology for electroless nickel-phosphorus and aluminum alloy surface plating, which is applied in liquid chemical plating, metal material coating process, coating, etc. The effect of saving electricity and water resources, good metallic luster and appearance, avoiding pollution and poisoning

Inactive Publication Date: 2010-01-06
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wang Airong used pre-plating Zn-Ni alloy layer, and Liu Bo et al. used pre-plating Zn-Ni-Fe alloy layer to replace the secondary zinc dipping process, but a small amount of cyanide such as NaCN and other additives were added to this solution. It is relatively complicated, and there is also a large pollution to the environment, which is very harmful to human health, and the operation is very dangerous
Invention patent 02133822.1 discloses a nickel immersion solution before electroless nickel plating on aluminum and aluminum alloys. This inv

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: The experimental material (pre-plating substrate) is 2024 aluminum alloy.

[0014] 1. Grinding: Grind the 2024 aluminum alloy sample with 60#, 200#, 400#, 800# water-resistant sandpaper until the surface is bright;

[0015] 2. Degreasing: Wipe the above-mentioned experimental materials in a fume hood with a cotton ball dipped in acetone. The operating temperature is room temperature and the time is about 30 seconds to remove oil and other pollutants on the surface;

[0016] 3. Washing: Use deionized water to wash the surface of the degreased experimental material, the operating temperature is room temperature, and the time is 40 seconds;

[0017] 4. Pretreatment liquid treatment: Put the experimental materials treated in the previous step into the following solution and soak for 45 seconds. The temperature of the solution is 30° C., and the pH of the solution is 13-14. The solution composition is: sodium molybdate 20g / L, sodium hydroxide 10g / L, and deionized...

Embodiment 2

[0023] Example 2: The experimental material (pre-plating substrate) is LC4 aluminum alloy.

[0024] 1. Grinding: Grind the LC4 aluminum alloy sample with 60#, 200#, 400#, 800# water-resistant sandpaper until the surface is bright;

[0025] 2. Degreasing: Wipe the polished LC4 aluminum alloy in a fume hood with a cotton ball dipped in acetone. The operating temperature is room temperature and the time is about 30 seconds to remove oil and other pollutants on the surface;

[0026] 3. Washing: Use deionized water to wash the surface of the degreased experimental material, the operating temperature is room temperature, and the time is 40 seconds;

[0027] 4. Pretreatment liquid treatment: Put the LC4 aluminum alloy treated in the previous step into the following solution for 45-60 seconds, the solution temperature is 25°C, and the solution pH=13-14. The solution composition is: sodium molybdate 30g / L, sodium hydroxide 15g / L, and deionized water as the balance.

[0028] 5. Washin...

Embodiment 3

[0033] Example 3: The experimental material (pre-plating substrate) is 2024 aluminum alloy.

[0034] 1. Grinding: Grind the 2024 aluminum alloy sample with 60#, 200#, 400#, 800# water-resistant sandpaper until the surface is bright;

[0035] 2. Degreasing: Wipe the above-mentioned 2024 aluminum alloy in a fume hood with a cotton ball dipped in acetone. The operating temperature is room temperature and the time is about 30 seconds to remove oil and other pollutants on the surface;

[0036] 3. Washing: use deionized water to wash the surface of the degreased 2024 aluminum alloy experimental material, the operating temperature is room temperature, and the time is 40 seconds;

[0037] 4. Pretreatment liquid treatment: Put the 2024 aluminum alloy treated in the previous step into the following solution for immersion for 120-150 seconds, the solution temperature is 30°C, and the solution pH=11-12. The composition of the solution is: sodium molybdate 10g / L, ammonia water 15ml / L, and...

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Abstract

The invention discloses a pretreatment solution used for an electroless nickel-phosphorus alloy plating layer on the surface of an aluminum alloy, which comprises the following components: 5-40g/L of sodium molybdate, 5-30g/L of sodium hydroxide or 10-40ml/L of ammonia and the balance of deionized water. The pretreatment solution has the following advantages that: the pretreatment solution simplifies the operation steps of nickel-phosphorus deposition to 9 steps from 15 steps, thereby being easy to realize industrialization and improving production efficiency; the pretreatment solution only consists of two substances, thereby reducing cost and improving economic benefits; the pretreatment solution does not need to adopt nitric acid for carrying out zinc withdrawal treatment, thereby avoiding the pollution and the toxication to chemical nickel plating solution, prolonging the service life of the plating solution, avoiding environmental pollution and reducing influences on the health of operation staffs; and the prepared nickel-phosphorus electroless plating layer has uniform densification, good corrosion resistance, high microhardness, firm combination with an aluminum alloy base body, good metal luster and good appearance, thereby providing a good protection effect for the aluminium alloy.

Description

1. Technical field [0001] The invention belongs to the technical field of metal corrosion and protection, and in particular relates to a pretreatment solution for electroless nickel-phosphorus alloy plating on the surface of aluminum alloys. 2. Background technology [0002] The density of aluminum alloy is relatively low, the strength is relatively high, close to or exceed high-quality steel, good plasticity, can be processed into various profiles, but also has excellent electrical conductivity, thermal conductivity and other characteristics, its consumption is second only to steel, so it is a As an important metal material, it has been widely used in aerospace, marine, communication, transportation, military, computer and other fields. [0003] Aluminum alloy has relatively high chemical activity, and its standard electrode potential is very negative, about -1.67 volts. In various environments, especially those containing chloride ions (Cl - ) environment, aluminum alloys...

Claims

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Application Information

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IPC IPC(8): C23C18/32C23C18/18
Inventor 梁平
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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