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Electro-assisted pickling of steel
US2022411952A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2022411952-A1 |
| Application number | US-201917778498-A |
| Country | US |
| Kind code | A1 |
| Filing date | Nov 25, 2019 |
| Priority date | Nov 25, 2019 |
| Publication date | Dec 29, 2022 |
| Grant date | — |
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- Title
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Abstract
Official abstract text for this publication.
A pickling process of a metallic strip is provided including the steps of: passing said metallic strip through at least a pickling bath being at a temperature between 1 and 100° C., applying an alternating current, having a current density of 1x102 to 1x105 A.m−2 of unit surface of said metallic strip to said metallic strip passing through said at least one pickling bath.
First claim
Opening claim text (preview).
What is claimed is: 1 - 11 (canceled) 12 . A pickling process of a metallic strip comprising the steps of: passing the metallic strip through a pickling bath being at a temperature between 1 and 100° C.; applying an alternating current on the metallic strip passing through the pickling bath, the alternating current applying a current density of 1×10 2 to 1×10 5 A.m −2 of unit surface of said metallic strip to said metallic strip passing through the pickling bath, the alternating current having an anodic period and a cathodic period with a cathodic/anodic pulse length ratio of 0.1 and 5.0. 13 . The pickling process as recited in claim 12 wherein the metallic strip is made of steel. 14 . The pickling process as recited in claim 12 wherein the metallic strip passes through the bath at a speed between 10 m.min −1 and 450 m.min −1 . 15 . The pickling process as recited in claim 12 wherein the pickling bath has a temperature of at least 40° C. 16 . The pickling process as recited in claim 12 wherein the pickling bath has a pickling acid or pickling salt concentration of at least 30 g.L −1 . 17 . The pickling process as recited in claim 12 wherein the pickling bath has a pickling acid or pickling salt concentration of at least 60 g.L −1 . 18 . The pickling process as recited in claim 12 wherein the current density is at least 1×10 3 A.m −1 . 19 . The pickling process as recited in claim 12 wherein the alternating current has a frequency between 0.5 and 100 Hz. 20 . The pickling process as recited in claim 12 wherein the alternating current has a frequency of at least 15 Hz. 21 . The pickling process as recited in claim 20 wherein the alternating current has a frequency of at most 50 Hz. 22 . The pickling process as recited in claim 12 wherein the alternating current has a frequency of at most 50 Hz. 22 . The pickling process as recited in claim 12 wherein the cathodic/anodic pulse length ratio is from 1.1 to 2.7.
Assignees
Inventors
Classifications
- C25F7/00Primary
Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects (for both electrolytic coating and removal C25D); Servicing or operating · CPC title
- C25F1/06Primary
Iron or steel · CPC title
Regeneration of process liquids · CPC title
Associated apparatus, e.g. for pretreating or after-treating · CPC title
by dipping · CPC title
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Frequently asked questions
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- What does patent US2022411952A1 cover?
- A pickling process of a metallic strip is provided including the steps of: passing said metallic strip through at least a pickling bath being at a temperature between 1 and 100° C., applying an alternating current, having a current density of 1x102 to 1x105 A.m−2 of unit surface of said metallic strip to said metallic strip passing through said at least one pickling bath.
- Who is the assignee on this patent?
- Arcelormittal
- What technology area does this patent fall under?
- Primary CPC classification C25F7/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Dec 29 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).