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Preparation method of high conductivity and high infrared emissivity film layer on magnesium alloy surface

A technology of infrared emissivity and high electrical conductivity, applied in the field of magnesium alloy surface treatment, can solve the problems of lack of electrical conductivity, falling off, affecting the heat dissipation performance of the casing, etc., to achieve high infrared emissivity, meet the requirements of use, high resistivity Effect

Active Publication Date: 2018-10-23
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the casings of electronic stand-alone aircraft in aviation vehicles usually use thermal control paint coatings. However, the thermal control paint coatings also do not have conductivity, and the bonding force between the thermal control paint and the magnesium alloy casing is poor. It is easy to cause falling off and affect the heat dissipation performance of the casing, and cannot meet the performance requirements of high conductivity and high infrared emissivity at the same time

Method used

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  • Preparation method of high conductivity and high infrared emissivity film layer on magnesium alloy surface
  • Preparation method of high conductivity and high infrared emissivity film layer on magnesium alloy surface
  • Preparation method of high conductivity and high infrared emissivity film layer on magnesium alloy surface

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preparation example Construction

[0030] The following examples provide a method for preparing a porous zinc-nickel alloy film with high conductivity and high infrared emissivity on the surface of a magnesium alloy. The method includes electroplating a porous zinc-nickel alloy on the surface of a magnesium alloy to prepare a high conductivity and high infrared emissivity film layer steps.

[0031] The magnesium alloy includes rare earth magnesium alloy and non-rare earth magnesium alloy.

[0032] In the step of electroplating the porous zinc-nickel alloy film layer, the electroplating solution used includes nickel salt, zinc salt / zinc oxide, ammonium salt, thiocyanate, surfactant and complexing agent.

[0033] The electroplating solution includes components at the following concentrations: 0.1-0.3 mol / L nickel salt, 0.1-0.4 mol / L zinc salt / zinc oxide, 1-4 mol / L ammonium chloride, 0.1-1 mol / L thiocyanate, 0.1-0.5mol / L complexing agent and 30mg / L sodium dodecyl sulfate.

[0034] The complexing agent includes o...

Embodiment 1

[0041] The sample to be treated in this implementation is a Mg-Li alloy with a size of 50 mm×50 mm×4 mm, and its chemical composition is shown in Table 1.

[0042] Table 1. Chemical composition of magnesium-lithium (Mg-Li) alloys

[0043]

[0044] The preparation process flow of the porous zinc-nickel alloy film layer on the surface of the Mg-Li alloy is as follows figure 1 Said, the preparation method mainly comprises the following steps:

[0045] 1) The sample is mechanically polished to No. 2000 with metallographic sandpaper, then cleaned with acetone, cleaned with ultrapure water, and finally dried;

[0046] 2) Alkaline washing to remove oil. The composition of the alkaline cleaning and degreasing solution is 1mol / L sodium hydroxide, 0.01mol / L sodium phosphate and 0.02mol / L sodium carbonate. The alkaline cleaning temperature is 80°C and the alkaline cleaning time is 10min. Clean the samples with ultrapure water;

[0047] 3) pickling. The pickling solution consists of...

Embodiment 2

[0055] The sample to be treated is an AZ91D magnesium alloy of 50mm×50mm×4mm, and its chemical composition is shown in Table 2.

[0056] Table 2. Chemical composition of AZ91D magnesium alloy

[0057]

[0058] The preparation process of the porous zinc-nickel alloy film layer on the surface of the AZ91D magnesium alloy is as follows figure 1 Said, the preparation method mainly comprises the following steps:

[0059] 1) The sample is mechanically polished to No. 2000 with metallographic sandpaper, then cleaned with acetone, cleaned with ultrapure water, and finally dried;

[0060] 2) Alkaline washing to remove oil. The composition of the alkaline cleaning and degreasing solution is 0.2mol / L sodium hydroxide, 0.1mol / L sodium phosphate and 0.1mol / L sodium carbonate, the alkaline cleaning temperature is 70°C, and the alkaline cleaning time is 15min. Finally, the samples were cleaned with ultrapure water;

[0061] 3) pickling. The pickling component solution is 0.5mol / L cit...

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Abstract

The invention provides a preparing method for a high-electricity-conductivity and high-infrared-emissivity film layer on the surface of a magnesium alloy. The method includes the step of electroplating a porous zinc-nickel alloy on the surface of the magnesium alloy to prepare the high-electricity-conductivity and high-infrared-emissivity film layer. Adopted electroplating liquid includes nickel salt, zinc salt / zinc oxide, ammonium salt, thiocyanate, a surface active agent and a complexing agent. The porous zinc-nickel alloy film layer prepared on the surface of the magnesium alloy has the performance of the high electricity conductivity and the performance of the high infrared emissivity at the same time, the infrared emissivity Epsilon h of the film layer is larger than or equal to 0.88, and the lapping resistance R is smaller than or equal to 5 momega; and an inner electronic product can be assisted in resisting a severe outer space environment, and the requirement for a magnesium alloy electronic single machine shell for aerospace is met.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment method, in particular to a preparation method of a high-conductivity high-infrared emissivity film layer on the magnesium alloy surface. Background technique [0002] For the aerospace field, aerospace vehicles must not only be lightweight and high-speed, but also have good performance, long life, and safety and reliability. In order to further improve the performance of the aircraft, it is necessary to reduce the weight as much as possible, and improve the unit thrust and structural efficiency. Magnesium alloys have low density and high specific strength, and have broad application prospects in the aerospace field. However, the surface treatment technology of magnesium-based alloys has become the main bottleneck hindering the application of magnesium alloys in aerospace products. Due to the need for space thermal control, not only the surface of the magnesium alloy casing is required to hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56C25D5/42
CPCC25D3/565C25D5/42
Inventor 郭兴伍郭嘉成徐文彬朱荣玉章志铖
Owner SHANGHAI JIAOTONG UNIV