Fuel cell interconnect heat treatment method
US-9196909-B2 · Nov 24, 2015 · US
Stainless separator for fuel cell and method of manufacturing the same
US9337496B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9337496-B2 |
| Application number | US-201514700732-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 30, 2015 |
| Priority date | Apr 23, 2008 |
| Publication date | May 10, 2016 |
| Grant date | May 10, 2016 |
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- Title
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Abstract
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A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe in the superficial layer of the stainless steel sheet, and forming a coating layer on the surface of the surface-modified stainless steel sheet. The coating layer is one selected from a metal nitride layer (MN x ), a metal/metal nitride layer (M/MN x ), a metal carbide layer (MC y ), and a metal boride layer (MB) (where 0.5≦x≦1, 0.42≦y≦1, 0.5≦z≦2).
First claim
Opening claim text (preview).
What is claimed is: 1. A stainless steel separator for fuel cells, the separator comprising: a stainless steel sheet having a matrix structure; a Cr-rich passive film directly formed on a surface of the stainless steel sheet, and containing 20˜75 wt % chromium; and a coating layer disposed directly on the Cr-rich passive film, wherein the coating layer is a metal boride layer (MB z ), and 0.5≦z≦2, and wherein the stainless steel separator is heat treated at 100˜300° C. under vacuum, in air or in an inert gas atmosphere. 2. The stainless steel separator according to claim 1 , wherein the passive film has a (Cr+Ni)/Fe ratio of 1 or more in terms of atomic weight ratio. 3. The stainless steel separator according to claim 1 , wherein the stainless steel separator has a corrosion current density less than 1 μA/cm 2 and a contact resistance less than 20 mΩ·cm 2 on both surfaces thereof.
Assignees
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Classifications
Manufacturing or production processes characterised by the final manufactured product · CPC title
- H01M8/021Primary
Alloys based on iron · CPC title
in the form of layered or coated products · CPC title
Energy storage using batteries · CPC title
Fuel cells · CPC title
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- What does patent US9337496B2 cover?
- A stainless steel separator for fuel cells and a method of manufacturing the same are disclosed. The method includes preparing a stainless steel sheet as a matrix, performing surface modification on a surface of the stainless steel sheet to form a Cr-rich passive film having a comparatively increased amount of Cr in a superficial layer of the stainless steel sheet by decreasing an amount of Fe …
- Who is the assignee on this patent?
- Hyundai Hysco, Hyundai Steel Co
- What technology area does this patent fall under?
- Primary CPC classification H01M8/021. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 10 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).