Process for manufacturing a recovery annealed coated steel substrate for packaging applications and a packaging steel product produced thereby
US-9920445-B2 · Mar 20, 2018 · US
Method for manufacturing chromium-chromium oxide coated substrates
US2016138178A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016138178-A1 |
| Application number | US-201414899241-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 21, 2014 |
| Priority date | Jun 20, 2013 |
| Publication date | May 19, 2016 |
| Grant date | — |
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Abstract
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A method for manufacturing a chromium metal-chromium oxide coated substrate by electrolytically depositing the chromium metal-chromium oxide coating on an electrically conductive substrate from an electrolyte solution that includes a trivalent chromium compound and a chelating agent, wherein the electrolyte solution is free of chloride ions and of a boric acid buffering agent, the electrically conductive substrate acts as a cathode and an anode including a catalytic coating of iridium oxide or a mixed metal oxide is chosen for reducing or eliminating the oxidation of Cr(III)-ions to Cr(VI)-ions.
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1 . A method for manufacturing a chromium metal-chromium oxide coated substrate by electrolytically depositing the chromium metal-chromium oxide coating on an electrically conductive substrate from an electrolyte solution that comprises a trivalent chromium compound and a chelating agent, wherein the electrolyte solution is free of chloride ions and of a boric acid buffering agent, the electrically conductive substrate acts as a cathode and an anode comprising a catalytic coating of iridium oxide or a mixed metal oxide is chosen for reducing or eliminating the oxidation of Cr(III)-ions to Cr(VI)-ions. 2 . The method according to claim 1 , wherein the electrolyte comprises a conductivity enhancing salt. 3 . The method according to claim 1 , wherein the chelating agent comprises an alkali metal carboxylate. 4 . The method according to claim 1 , wherein the electrolyte solution is free of a buffering agent. 5 . The method according to claim 1 , wherein the trivalent chromium compound comprises basic chromium (III) sulphate. 6 . The method according to claim 1 , wherein the mixed metal oxide comprises oxides of iridium and tantalum. 7 . The method according to claim 1 , wherein the electrolyte solution is free of a depolariser. 8 . The method according to claim 1 , wherein the pH of the electrolyte solution is adjusted to between pH 2.6 and pH 3.4. 9 . The method according to claim 1 , wherein the electrically conductive substrate is provided by electrolytically depositing a tin coating on one or both sides of a steel substrate and subjecting the tin coated steel to a diffusion annealing treatment to form an iron-tin alloy on the steel. 10 . The method according to claim 1 , wherein the electrically conductive substrate comprises blackplate or tinplate. 11 . The method according to claim 1 , wherein an organic coating is provided on one or both sides of the chromium metal-chromium oxide coated substrate. 12 . A chromium metal-chromium oxide coated substrate produced according to the method of claim 1 , wherein the coating additionally comprises chromium carbide. 13 . The chromium metal-chromium oxide coated substrate according to claim 12 , wherein the coating additionally comprises organic carbon. 14 . The chromium metal-chromium oxide coated substrate according to claim 12 , wherein the coating additionally comprises chromium sulphate. 15 . Packaging comprising the chromium metal-chromium oxide coated substrate according to claim 12 . 16 . The method according to claim 1 , wherein the electrolyte comprises an alkali metal sulphate. 17 . The method according to claim 1 , wherein the electrolyte comprises a potassium sulphate or sodium sulphate. 18 . The method according to claim 1 , wherein the chelating agent comprises potassium formate or sodium formate. 19 . The method according to claim 1 , wherein the electrolyte solution is free of potassium bromide. 20 . The method according to claim 1 , wherein the pH of the electrolyte solution is adjusted to between pH 2.8 and pH 3.0.
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- What does patent US2016138178A1 cover?
- A method for manufacturing a chromium metal-chromium oxide coated substrate by electrolytically depositing the chromium metal-chromium oxide coating on an electrically conductive substrate from an electrolyte solution that includes a trivalent chromium compound and a chelating agent, wherein the electrolyte solution is free of chloride ions and of a boric acid buffering agent, the electrically …
- Who is the assignee on this patent?
- Tata Steel Ijmuiden Bv
- What technology area does this patent fall under?
- Primary CPC classification C25D3/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu May 19 2016 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).