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A kind of preparation method of graphite coating

A technology of graphite coating and electrodeposition, which is applied in the direction of electrolytic inorganic material coating, etc., can solve the problems of high temperature, large energy loss, and slow growth of high-frequency discharge graphite, so as to achieve fast graphite growth, low cost, and good crystallinity Effect

Active Publication Date: 2016-01-20
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

The temperature required by the thermal decomposition method is too high and the energy loss is large, while the growth rate of high-frequency discharge graphite is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A two-electrode system is adopted, that is, graphite is used as an auxiliary electrode, and 304 stainless steel is used as a working electrode. Before synthesis, the surface of stainless steel needs to be polished to 240# with water abrasive paper, cleaned and dried with distilled water and acetone, so that the prepared coating can be well combined with the stainless steel substrate. The graphite coating was prepared in a mixed molten salt of sodium carbonate and sodium chloride (sodium carbonate: sodium chloride = 2:8 (molar ratio)) at 900 °C, and the deposition current density was 200mA / cm 2 , and the deposition time was 1 hour. In order to avoid side reactions such as oxidation during the synthesis process, a protective measure of argon gas was adopted, and finally a carbon layer was formed on the surface of the stainless steel.

Embodiment 2

[0015] A two-electrode system is adopted, that is, graphite is used as an auxiliary electrode, and 316 stainless steel is used as a working electrode. Before synthesis, the surface of stainless steel needs to be polished to 240# with water abrasive paper, cleaned and dried with distilled water and acetone, so that the prepared coating can be well combined with the stainless steel substrate. The graphite coating was prepared in a mixed molten salt of sodium carbonate and sodium chloride (sodium carbonate: sodium chloride = 72:28 (molar ratio)) at 800 °C, and the deposition current density was 150mA / cm 2 , and the deposition time was 1 hour. In order to avoid side reactions such as oxidation during the synthesis process, a protective measure of argon gas was adopted, and finally a carbon layer was formed on the surface of the stainless steel.

Embodiment 3

[0017] A two-electrode system is adopted, that is, graphite is used as an auxiliary electrode, and 304 stainless steel is used as a working electrode. Before synthesis, the surface of stainless steel needs to be polished to 240# with water abrasive paper, cleaned and dried with distilled water and acetone. Subsequently, the multi-arc ion plating technology was used to pre-deposit a thickness of 3 chrome coating. The graphite coating was prepared in a mixed molten salt of sodium carbonate and sodium chloride (sodium carbonate: sodium chloride = 2:8 (molar ratio)) at 900 °C, and the deposition current density was 200mA / cm 2 , and the deposition time was 1 hour. In order to avoid side reactions such as oxidation during the synthesis process, protective measures such as argon flow were adopted, and a graphite coating with high crystallinity was finally obtained.

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Abstract

The invention aims to provide a preparation method of a graphite coating. According to the invention, a graphite conductive coating is prepared on the surface of a metal matrix by a molten salt electrodeposition method. The temperature is below 1000 DEG C. The preparation method of the graphite coating has characteristics of simple operation technology, high efficiency, low cost and the like. The prepared coating is corrosion resistant and conductive, and can be used as a surface protective coating for a metal bipolar plate of a proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to the preparation of a graphite coating, and in particular provides a new method for preparing a graphite coating on the surface of a metal substrate. Background technique [0002] Graphite has excellent thermal conductivity, electrical conductivity, corrosion resistance, and many other properties. Graphite is one of the most high temperature resistant lightweight materials known today. When the temperature rises, not only does it not soften, but its strength increases instead. At a high temperature of 2500°C, the tensile strength of graphite is twice as high as that at room temperature. The thermal expansion coefficient of graphite and its materials is very small, and it can withstand rapid temperature changes. The thermal conductivity of graphite is 3 times that of carbon steel, 6 times that of stainless steel, and hundreds of times that of other non-metallic materials. It is the only non-metallic material that is both resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/08
Inventor 吕旺燕曾潮流
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI