Highly conductive and corrosion-resistant graphitic carbon protective multilayer composite coating and its preparation method and application

A multi-layer composite and high-conductivity technology, which is applied in coatings, metal material coating processes, fuel cell components, etc., can solve the problems of plate performance degradation and contact resistance increase, and achieve low contact resistance, structural Densification, the effect of improving the bonding strength of the membrane base

Active Publication Date: 2021-09-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after a long period of operation, the increase in contact resistance leads to a particularly serious degradation of the performance of the plate

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Highly conductive and corrosion-resistant graphitic carbon protective multilayer composite coating and its preparation method and application
  • Highly conductive and corrosion-resistant graphitic carbon protective multilayer composite coating and its preparation method and application
  • Highly conductive and corrosion-resistant graphitic carbon protective multilayer composite coating and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] In some more specific embodiments, the preparation method includes: using high-power pulsed magnetron sputtering technology, placing the substrate in a reaction chamber, using a chromium-iridium composite target as the target material, and using an inert gas as the The working gas is deposited on the surface of the substrate to form a chromium-iridium transition layer, wherein the high-power pulse magnetron sputtering technology adopts a pulse frequency of 400-800 Hz, a pulse width of 50-200 μs, and a pulse voltage of 800-1000 V, The power is 2.0~3.5KW, the pressure of the reaction chamber is 1.4~2.1mTorr, the substrate bias is -50V~-150V, the amount of inert gas is 30~70sccm, the deposition temperature is 40~80°C, and the deposition time is 5~15min.

[0036]Further, the inert gas includes argon, but is not limited thereto.

[0037] In some more specific embodiments, the preparation method includes: using DC magnetron sputtering technology, using a graphite target as a...

Embodiment 1

[0050] In this embodiment, the preparation method of the highly conductive corrosion-resistant protective coating on the metal bipolar plate is as follows:

[0051] S1. The substrate is made of 316L stainless steel, and the stainless steel bipolar plate is ultrasonically cleaned, dried and placed in a vacuum chamber, fixed on the workpiece bracket, and vacuumed to 2.0×10 -5 Below Torr, turn on the ion source under the conditions of argon gas flow rate of 100 sccm and bias voltage of -450V, adjust the output voltage to 1200V, and use argon plasma to etch the surface of the stainless steel bipolar plate for 60 minutes;

[0052] S2. Introduce Ar gas into the cavity (the input amount of Ar gas is 30sccm), adopt high-power pulse magnetron sputtering technology, maintain the cavity pressure at 1.4mTorr, open the chromium-iridium composite sputtering target (iridium content 2%wt) connected high-power pulse power supply, set the power supply frequency to 400Hz, pulse width to 50µs, pu...

Embodiment 2

[0056] In this embodiment, the preparation method of the highly conductive corrosion-resistant protective coating on the metal bipolar plate is as follows:

[0057] S1. The substrate is made of 316L stainless steel, and the stainless steel bipolar plate is ultrasonically cleaned, dried and placed in a vacuum chamber, fixed on the workpiece bracket, and vacuumed to 2.0×10 -5 Below Torr, turn on the ion source under the conditions of argon gas flow rate of 40 sccm and bias voltage of -150V, adjust the output voltage to 1200V, and use argon plasma to etch the surface of the stainless steel bipolar plate for 30 minutes;

[0058] S2. Introduce Ar gas into the cavity (the input amount of Ar gas is 60sccm), adopt high-power pulse magnetron sputtering technology, maintain the cavity pressure at 2.0mTorr, open the chromium-iridium composite sputtering target (iridium content 10%wt) connected high-power pulse power supply, set the power frequency to 800Hz, pulse width to 100µs, pulse vo...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a high-conductivity and corrosion-resistant graphite carbon protective multilayer composite coating as well as its preparation method and application. The highly conductive and corrosion-resistant graphite-like carbon protective multilayer composite coating includes a chromium-iridium transition layer and a graphite-like amorphous carbon layer formed sequentially on the surface of the substrate, wherein the content of iridium in the chromium-iridium transition layer is 2 ~10wt%. Further, the substrate includes a metal bipolar plate. The highly conductive and corrosion-resistant graphitic carbon protective multilayer composite coating provided by the present invention contains a chromium-iridium transition layer, which effectively provides a corrosion buffer layer through the doping of iridium elements, and the transition layer will form an oxide layer after corrosion. Iridium conductive path, this conductive path can avoid the continuous generation of chromium oxide layer, avoid the sharp increase of contact resistance, so as to realize the long-term protection of the metal bipolar plate.

Description

technical field [0001] The invention belongs to the technical field of surface engineering protection, and in particular relates to a high-conductivity and corrosion-resistant graphite-carbon protective multilayer composite coating and its preparation method and application. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are a new type of energy source that can directly convert hydrogen energy into electricity. Because of its advantages such as fast start-up, relatively low operating temperature, rapid response to various environments, no pollution, and high energy efficiency, it has a good application prospect in new energy vehicles, fixed and portable power supplies. A cell unit of a proton exchange membrane fuel cell usually consists of a bipolar plate (BPP), a membrane electrode (MEA), a gasket, and an end plate. Among the many components, the bipolar plate occupies 80% of the total mass of the fuel cell, almost the entire volume, and about 1...

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): C23C14/35C23C14/16C23C14/06H01M8/0202H01M8/10
CPCC23C14/352C23C14/3485C23C14/165C23C14/0605H01M8/0202H01M8/10Y02E60/50
Inventor 汪爱英李昊张栋马冠水陈仁德
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap