Austenitic stainless steel sheet for fuel cell separators and production method therefor
US-2022085388-A1 · Mar 17, 2022 · US
Production method for stainless steel sheet for fuel cell separators
US11618967B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11618967-B2 |
| Application number | US-201816649984-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 27, 2018 |
| Priority date | Oct 25, 2017 |
| Publication date | Apr 4, 2023 |
| Grant date | Apr 4, 2023 |
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Abstract
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A production method for a stainless steel sheet for fuel cell separators comprises: preparing a stainless steel sheet as a material; thereafter removing an oxide layer at a surface of the stainless steel sheet; and thereafter subjecting the stainless steel sheet to electrolytic etching treatment in an active region of the stainless steel sheet.
First claim
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The invention claimed is: 1. A production method for a stainless steel sheet for fuel cell separators, the production method comprising: preparing a stainless steel sheet as a material; thereafter removing an oxide layer at a surface of the stainless steel sheet; and thereafter subjecting the stainless steel sheet to electrolytic etching treatment in an active region of the stainless steel sheet wherein the active region is defined as a potential range that, in an anodic polarization curve obtained when polarizing a stainless steel sheet in a treatment solution in an anodic direction from a natural immersion potential at a scanning rate of 1 mV/s, appears first with potential increase and in which the current density increases as the potential increases and reaches a local maximum value and then decreases to less than or equal to 1/100 of the local maximum value, and wherein in the case of austenitic stainless steel, the active region is defined as a potential range until the current density decreases to less than or equal to 1/2 of the local maximum value. 2. The production method for a stainless steel sheet for fuel cell separators according to claim 1 , wherein the oxide layer at the surface of the stainless steel sheet is removed by electrolysis. 3. The production method for a stainless steel sheet for fuel cell separators according to claim 2 , wherein the electrolysis is cathodic electrolysis. 4. The production method for a stainless steel sheet for fuel cell separators according to claim 1 , comprising subjecting the stainless steel sheet to surface stabilizing treatment, after the electrolytic etching treatment. 5. The production method for a stainless steel sheet for fuel cell separators according to claim 4 , wherein the surface stabilizing treatment is immersion in an oxidizing solution or electrolysis in a passive region of the stainless steel sheet. 6. The production method for a stainless steel sheet for fuel cell separators according to claim 1 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 7. The production method for a stainless steel sheet for fuel cell separators according to claim 2 , comprising subjecting the stainless steel sheet to surface stabilizing treatment, after the electrolytic etching treatment. 8. The production method for a stainless steel sheet for fuel cell separators according to claim 3 , comprising subjecting the stainless steel sheet to surface stabilizing treatment, after the electrolytic etching treatment. 9. The production method for a stainless steel sheet for fuel cell separators according to claim 7 , wherein the surface stabilizing treatment is immersion in an oxidizing solution or electrolysis in a passive region of the stainless steel sheet. 10. The production method for a stainless steel sheet for fuel cell separators according to claim 8 , wherein the surface stabilizing treatment is immersion in an oxidizing solution or electrolysis in a passive region of the stainless steel sheet. 11. The production method for a stainless steel sheet for fuel cell separators according to claim 2 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 12. The production method for a stainless steel sheet for fuel cell separators according to claim 3 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 13. The production method for a stainless steel sheet for fuel cell separators according to claim 4 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 14. The production method for a stainless steel sheet for fuel cell separators according to claim 5 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 15. The production method for a stainless steel sheet for fuel cell separators according to claim 7 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 16. The production method for a stainless steel sheet for fuel cell separators according to claim 8 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 17. The production method for a stainless steel sheet for fuel cell separators according to claim 9 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid. 18. The production method for a stainless steel sheet for fuel cell separators according to claim 10 , wherein a treatment solution used in the electrolytic etching treatment is a sulfuric acid aqueous solution, a hydrochloric acid aqueous solution, or a mixed aqueous solution of sulfuric acid and hydrochloric acid.
Assignees
Inventors
Classifications
Manufacturing or production processes characterised by the final manufactured product · CPC title
Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title
with niobium or tantalum · CPC title
with copper · CPC title
containing silicon · CPC title
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Frequently asked questions
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- What does patent US11618967B2 cover?
- A production method for a stainless steel sheet for fuel cell separators comprises: preparing a stainless steel sheet as a material; thereafter removing an oxide layer at a surface of the stainless steel sheet; and thereafter subjecting the stainless steel sheet to electrolytic etching treatment in an active region of the stainless steel sheet.
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C25F3/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 04 2023 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).