Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of thermal control coating on az91d magnesium alloy surface

A technology of thermal control coating and magnesium alloy, which is applied in anodic oxidation and other directions, can solve the problems of high quality of thermal control coating, and achieve the effect of non-loose coating, high specific stiffness and uniform thermal control coating

Active Publication Date: 2012-02-08
HARBIN INST OF TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a thermal control coating on the surface of an AZ91D magnesium alloy in order to solve the problem of high quality of the thermal control coating using aluminum alloy as the substrate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific embodiment one: the preparation method of the thermal control coating on the surface of magnesium alloy in this embodiment is realized by the following steps: 1. Magnesium alloy surface pretreatment: the magnesium alloy is immersed in the sodium hydroxide solution that concentration is 100g / L, then in Keep warm for 15 to 20 minutes at 70°C to 90°C, rinse with clean water for 3 to 5 times, then rinse with distilled water for 3 to 5 times, and dry; 2. Electrolyte configuration for magnesium alloy micro-arc oxidation: magnesium alloy micro-arc oxidation The electrolyte is composed of sodium aluminate, borax, potassium hydroxide, complexing agent and coloring additives, wherein the concentration of sodium aluminate in the magnesium alloy micro-arc oxidation electrolyte is 20g / L-80g / L, and the concentration of borax is 5g / L L~20g / L, the concentration of potassium hydroxide is 1g / L~10g / L, the concentration of complexing agent is 20g / L~50g / L, the concentration of color...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the magnesium alloy described in step 1 is magnesium alloy AZ91D or magnesium alloy AM20. Others are the same as in the first embodiment.

[0011] The thermal control coating obtained on the surface of the magnesium alloy by this embodiment is uniform, dense and has high strength and bonding force. The solar absorptivity of the thermal control coating can reach 0.80-0.95, and the infrared emissivity can reach 0.80-0.90.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the complexing agent described in step 2 is ethylenediamine or ethylenediaminetetraacetic acid. Others are the same as in the first or second embodiment.

[0013] The thermal control coating obtained on the surface of the magnesium alloy by this embodiment is uniform, dense and has high strength and bonding force. The solar absorptivity of the thermal control coating can reach 0.80-0.95, and the infrared emissivity can reach 0.80-0.90.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
emissivityaaaaaaaaaa
emissivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a thermal control coating on the surface of an AZ91D magnesium alloy, which relates to a method for preparing a thermal control coating on the surface of an alloy. The invention solves the problem that the quality of the thermal control coating using the aluminum alloy as the substrate is high. The preparation method of the present invention is realized according to the following steps: magnesium alloy surface pretreatment; magnesium alloy micro-arc oxidation electrolyte configuration; magnesium alloy micro-arc oxidation electrolyte is added to the micro-arc oxidation electrolytic cell, and then the pretreated magnesium alloy is placed It is used as an anode in the magnesium alloy micro-arc oxidation electrolyte, powered by a pulsed micro-arc oxidation power supply, reacted for 5 minutes to 40 minutes, and then the surface of the magnesium alloy is cleaned with distilled water and dried to obtain a thermal control coating on the surface of the magnesium alloy. The density of magnesium alloy used in the present invention is small, only 1.73g / cm3, about 2 / 3 of the density of aluminum alloy. Compared with aluminum alloy, the thermal control coating obtained by adopting the method of the invention reduces weight by 30%.

Description

technical field [0001] The invention relates to a method for preparing a thermal control coating on an alloy surface. Background technique [0002] In recent years, with the development of modern aerospace technology, military satellites have developed towards large-scale, high-precision and multi-functional aspects, and the payload of satellites has continued to increase, which puts forward higher requirements for the lightweight structure of satellites. Magnesium has low chemical stability and poor corrosion resistance, and its potential is the most negative among practical metals. Galvanic corrosion may occur when it is in contact with other metal connectors; the oxide film naturally formed by magnesium in the air is relatively weak. Loose, poor wear resistance, can not play a protective role. Therefore, the substrates for preparing high-emissivity thermal control coatings are mainly aluminum alloys. The currently used high-emissivity thermal control coatings include two...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
Inventor 吴晓宏秦伟卢松涛王小东解卿
Owner HARBIN INST OF TECH