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Coexistence of highly conductive and corrosion-resistant amorphous/nanocrystalline composite coating and its preparation method and application

A technology of coating and electric current, applied in the direction of coating, nanotechnology, nanotechnology, etc., can solve the problems of high price, affecting battery power, stability and life, and achieve no columnar defects, excellent corrosion resistance and protection performance, deposition The effect of high speed

Active Publication Date: 2022-07-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high price of noble metal coatings limits its application. Due to the existence of grain boundaries and corrosion oxides in metal carbides, the conductive corrosion resistance needs to be further improved. The preparation process of conductive polymers and amorphous carbon coatings The cumbersome steps limit further development
In addition, during the long-term service of PEMFCs, there are still great challenges in maintaining high corrosion resistance and low interface contact resistance of the coating, which greatly affects the electric power, stability and life of the battery.

Method used

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  • Coexistence of highly conductive and corrosion-resistant amorphous/nanocrystalline composite coating and its preparation method and application
  • Coexistence of highly conductive and corrosion-resistant amorphous/nanocrystalline composite coating and its preparation method and application
  • Coexistence of highly conductive and corrosion-resistant amorphous/nanocrystalline composite coating and its preparation method and application

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preparation example Construction

[0029] Specifically, as an aspect of the technical solution of the present invention, a method for preparing a highly conductive and corrosion-resistant amorphous / nanocrystalline composite coexisting coating involved includes:

[0030] Provide metal base;

[0031] Using arc ion plating composite high-power pulsed magnetron sputtering technology, Cr target is used as arc target, Al target is used as high-power pulsed magnetron sputtering target, and methane is used as working gas to deposit on the surface of the metal substrate to form Cr- Al-C layer;

[0032] and, performing vacuum low-temperature heat treatment on the metal substrate deposited with the Cr-Al-C layer to obtain a highly conductive and corrosion-resistant amorphous / nanocrystalline composite coexisting coating;

[0033] The coating has an amorphous structure and a nanocrystalline structure, the amorphous structure is a thick striped structure, and the amorphous structure is Cr-Al-C; the nanocrystalline structure...

Embodiment 1

[0051] In this embodiment, the substrate is a 316L stainless steel bipolar plate used in a proton exchange membrane fuel cell, and the Cr-Al-C / Cr on the surface of the substrate is 2 The preparation method of AlC coating is as follows:

[0052] (1) Put the 316L stainless steel bipolar plate substrate after cleaning, degreasing and drying into the cavity, and wait until the vacuum pressure in the cavity is 3.0×10 -5 Below Torr, 180sccm of argon gas was introduced into the vacuum chamber, the substrate bias was -60V, the linear anode ion source current was set to 0.8A, and the substrate was etched with ionized argon ions for 60min.

[0053] (2) Using arc ion plating composite high-power pulsed magnetron sputtering technology, using Cr target as the arc target, the current of the arc target is 40A, using the Al target as the high-power pulsed magnetron sputtering target, the high-power pulse duty cycle is 25%, the average sputtering power of the Al target is 2500W, the target di...

Embodiment 2

[0064] In this embodiment, the substrate is a 304 stainless steel bipolar plate used for proton exchange membrane fuel cells, and the Cr-Al-C / Cr on the surface of the substrate is 2 The preparation method of AlC coating is as follows:

[0065] (1) Put the 304 stainless steel bipolar plate substrate after cleaning, degreasing and drying into the cavity, and wait until the vacuum pressure in the cavity is 3.0×10 -5 Below Torr, 150sccm of argon gas was introduced into the vacuum chamber, the substrate bias was -90V, the linear anode ion source current was set to 0.8A, and the substrate was etched with ionized argon ions for 60min.

[0066] (2) Using arc ion plating composite high-power pulsed magnetron sputtering technology, using Cr target as the arc target, the current of the arc target is 40A, using the Al target as the high-power pulsed magnetron sputtering target, the high-power pulse duty cycle is 35%, the average sputtering power of the Al target is 3000W, the target dist...

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Abstract

The invention discloses a highly conductive and corrosion-resistant amorphous / nanocrystalline composite coexisting coating and a preparation method and application thereof. The preparation method comprises: using arc ion plating compound high-power pulsed magnetron sputtering technology, using Cr target as the arc target, using the Al target as the high-power pulsed magnetron sputtering target, using methane as the working gas, and using depositing to form a Cr-Al-C layer; and, performing vacuum low-temperature heat treatment on the metal substrate deposited with the Cr-Al-C layer to obtain a highly conductive and corrosion-resistant amorphous / nanocrystalline composite coexistence coating; wherein the The coating has an amorphous structure and a nanocrystalline structure, and the amorphous structure is a thick striped structure. The coating prepared by the invention not only improves the electrical conductivity of the interface with the substrate, but also improves the corrosion resistance, and has both excellent electrical conductivity and corrosion resistance protection performance in harsh environments.

Description

technical field [0001] The invention belongs to the technical field of metal surface engineering protection, and relates to a highly conductive and corrosion-resistant amorphous / nanocrystalline composite coexisting coating as well as a preparation method and application thereof, in particular to a highly conductive and corrosion-resistant amorphous / nanocrystalline (Cr- Al-C / Cr 2 AlC) composite coexistence coating and its preparation and application. Background technique [0002] In recent years, with the urgent need for automotive technological innovation and the rapid development of fuel cell technology, governments and companies in many countries have been committed to promoting the development of fuel cell vehicles. Among them, proton exchange membrane fuel cells (PEMFCs) are the fifth generation fuel cells after solid fuel cells. It has developed rapidly and has been widely used in automobiles, airplanes, ships and other fields. However, due to its high cost and large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C14/35C23C14/06C23C14/58H01M8/0228H01M8/0208B82Y30/00B82Y40/00
CPCC23C14/325C23C14/35C23C14/3485C23C14/0635C23C14/0021C23C14/5806H01M8/0228H01M8/0208B82Y30/00B82Y40/00
Inventor 汪爱英马冠水袁江淮王振玉王丽
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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