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Anti-corrosion conductive chemical conversion film-forming liquid for electronic shell, and preparation method of conversion film

A chemical conversion film and chemical conversion technology, which is applied in the field of anti-corrosion and conductive chemical conversion film forming liquid and conversion film preparation of electronic housings, can solve the problems of increased surface contact resistance and reduced conductivity of the conversion film to prevent corrosion , The electrical conductivity does not decrease, and the electrical conductivity is good

Inactive Publication Date: 2020-07-17
广州珈鹏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the salt spray test, the surface contact resistance increases, which reduces the conductivity of the conversion coating to a certain extent.

Method used

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  • Anti-corrosion conductive chemical conversion film-forming liquid for electronic shell, and preparation method of conversion film
  • Anti-corrosion conductive chemical conversion film-forming liquid for electronic shell, and preparation method of conversion film
  • Anti-corrosion conductive chemical conversion film-forming liquid for electronic shell, and preparation method of conversion film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A corrosion-resistant conductive chemical conversion film-forming liquid for an electronic shell, comprising: sodium phosphate 30g / L, sodium stannate 35g / L, sodium permanganate 25g / L, nickel nitrate 0.2g / L, polyamide-amine tree 2 g / L of macromolecules, 17 g / L of phosphoric acid, the balance of water, and the pH of the chemically converted membrane solution was 4.8. The preparation method of the chemical conversion film includes the following steps: (1) sequentially using 500 # , 1000 # , 1500 # Polished with sandpaper, then ultrasonically cleaned with absolute ethanol and water for 10 min.

[0052] (2) Immerse the magnesium alloy electronic shell in a micro-etching solution composed of 10g / L hydrochloric acid, 5g / L ethylene glycol and the balance of water, and slightly etch the surface of the electronic shell to a Ra of 0.21μm, take out the water and wash . The micro-etching temperature was 40°C, and the micro-etching time was 2 min.

[0053] (3) The electron shell...

Embodiment 2

[0057]A corrosion-resistant conductive chemical conversion film-forming solution for electronic housings, including: 35g / L sodium dihydrogen phosphate, 40g / L sodium stannate, 30g / L sodium permanganate, 0.3g / L nickel nitrate, polyamide-amine Dendrimer-like macromolecule 3g / L, nitric acid 20g / L, balance water, and the pH of the chemical conversion film-forming liquid are 4.5. The preparation method of the chemical conversion film comprises the following steps: (1) sequentially using 500 # 、1000 # , 1500 # Polish with sandpaper, then ultrasonically clean with absolute ethanol and water for 15 minutes.

[0058] (2) Soak the magnesium alloy electronic housing in a micro-etching solution composed of 15g / L hydrochloric acid, 6g / L ethylene glycol, and the rest of water, micro-etch the surface of the electronic housing until the Ra is 0.38μm, take it out and wash it with water . The microetching treatment temperature is 35° C., and the microetching treatment time is 4 minutes.

[...

Embodiment 3

[0063] A corrosion-resistant conductive chemical conversion film-forming solution for electronic housings, including: 40g / L potassium phosphate, 45g / L potassium stannate, 35g / L potassium permanganate, 0.4g / L calcium nitrate, polyamide-amine resin 4g / L of macromolecule, 25g / L of nitric acid, surplus water, the pH of described chemical transformation membrane-forming liquid is 4.1. The preparation method of the chemical conversion film comprises the following steps: (1) sequentially using 500 # 、1000 # , 1500 # Polish with sandpaper, then ultrasonically clean with absolute ethanol and water for 20 minutes.

[0064] (2) Soak the magnesium alloy electronic housing in a micro-etching solution composed of 120g / L hydrochloric acid, 10g / L ethylene glycol, and the rest of water, micro-etch the surface of the electronic housing until the Ra is 0.43μm, take it out and wash it with water . The microetching treatment temperature is 55° C., and the microetching treatment time is 4 minut...

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Abstract

The invention discloses anti-corrosion conductive chemical conversion film-forming liquid for an electronic shell. The anti-corrosion conductive chemical conversion film-forming liquid is prepared from the components: 20-50 g / L of phosphate, 30-50 g / L of stannate, 20-40 g / L of permanganate, 0.1-0.5 g / L of a grain refiner, 1-5 g / L of a polyamide-amine dendrimer, 10-30 g / L of a pH regulator and thebalance of water, wherein the pH of the chemical conversion film-forming liquid is 3-6. A preparation method of a chemical conversion film comprises the steps of shell microetching, hydroxylation treatment and film-forming treatment. A process is simple, operation is easy and convenient, and the prepared chemical conversion film is high in binding strength, compact in surface topography and uniform in grain size and has excellent corrosion resistance and high electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion treatment on the surface of magnesium alloys, in particular to a method for preparing an electronic shell corrosion-resistant conductive chemical conversion film-forming liquid and a conversion film. Background technique [0002] Magnesium alloys have many special properties that make them widely used in all walks of life. Because of its good anti-electromagnetic interference and excellent shielding ability to block electromagnetic waves, it is suitable for electronic product housings that prevent electromagnetic interference. However, magnesium alloys have high chemical activity and are prone to corrosion without coating protection, which restricts their application to a certain extent. The use of chemical conversion film-forming liquid to treat the surface of magnesium alloy can form a protective coating with good corrosion resistance. However, most conversion films have poor electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/18C23C22/78
CPCC23C22/18C23C22/78
Inventor 谢珈璐
Owner 广州珈鹏科技有限公司
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