GB1250013A - Process of electroplating with chromium and coating with chromium oxide - Google Patents
Process of electroplating with chromium and coating with chromium oxideInfo
- Publication number
- GB1250013A GB1250013A GB4815168A GB4815168A GB1250013A GB 1250013 A GB1250013 A GB 1250013A GB 4815168 A GB4815168 A GB 4815168A GB 4815168 A GB4815168 A GB 4815168A GB 1250013 A GB1250013 A GB 1250013A
- Authority
- GB
- United Kingdom
- Prior art keywords
- article
- steel
- stock
- chromium
- cathode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/38—Chromatising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
1,250,013. Electrolytically coating steel with Cr and chromium oxide; lead alloy. UNITED STATES STEEL CORP. Oct.10, 1968 [Nov.3, 1967], No.48151/68. Heading C7A and C7B. Can stock is produced by electrolytically coating steel with both Cr and overlying chromium oxide. The process comprises (a) providing a first stock-treating zone including an electrolyte containing from 40-100 g/1 of chromium trioxide and also containing sulphate ions (and optionally fluoride ions), the electrolyte being effective, under the influence of an electric current, to deposit metallic Cr and a hydrated, trivalent Cr-containing oxide upon stock as a cathode and capable of chemically dissolving the oxide; (b) continuously moving a cleaned, elongated, flat rolled steel stock article as cathode through the first zone while applying to the article a current of at least 500 amps/sq ft of cathode surface for a time sufficient to electro-chemically deposit a continuous layer of metallic Cr of a weight of at least 1.5 mg/sq ft of article surface together with an overlying chromium oxide film; (c) continuously passing the article from the first zone into and through a second stock-treating zone containing said electrolyte; and (d) applying electric current to the article as cathode in the second zone of zero or less than 212 amps/sq ft of cathode surface to provide on the final, Cr-plated article a continuous oxide film overlying the metallic Cr layer and containing 0.5 to 2.0 mg of trivalent Cr per sq ft of article surface. The sulphate ions may be contributed by H 2 SO 4 or chromium sulphate and the fluoride ions by HF or a silicofluoride. The steel may be strip moving at 200-1000 feet/min. For the electrolysis, the counter electrodes may be Pb-1% Ag alloy. Before the Cr and chromium oxide coating treatment, the steel may be cleaned by electrolytic alkali treatment and be electrolytically pickled. Following the chromium oxide coating treatment, the steel may be coated with a clear epoxy phenolic enamel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68031367A | 1967-11-03 | 1967-11-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1250013A true GB1250013A (en) | 1971-10-20 |
Family
ID=24730601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4815168A Expired GB1250013A (en) | 1967-11-03 | 1968-10-10 | Process of electroplating with chromium and coating with chromium oxide |
Country Status (6)
| Country | Link |
|---|---|
| BE (1) | BE723045A (en) |
| CA (1) | CA954821A (en) |
| DE (1) | DE1806488A1 (en) |
| ES (1) | ES359557A1 (en) |
| GB (1) | GB1250013A (en) |
| NL (1) | NL164617C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3755091A (en) * | 1969-06-19 | 1973-08-28 | Nat Steel Corp | Process for reducing discoloration of electrochemically treated chromium plated ferrous metal strip |
-
1968
- 1968-08-26 CA CA028,505A patent/CA954821A/en not_active Expired
- 1968-10-10 GB GB4815168A patent/GB1250013A/en not_active Expired
- 1968-10-25 ES ES359557A patent/ES359557A1/en not_active Expired
- 1968-10-28 BE BE723045D patent/BE723045A/xx not_active IP Right Cessation
- 1968-10-31 DE DE19681806488 patent/DE1806488A1/en not_active Withdrawn
- 1968-11-04 NL NL6815691A patent/NL164617C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL164617B (en) | 1980-08-15 |
| ES359557A1 (en) | 1970-06-01 |
| NL6815691A (en) | 1969-05-06 |
| NL164617C (en) | 1981-01-15 |
| CA954821A (en) | 1974-09-17 |
| DE1806488A1 (en) | 1969-08-14 |
| BE723045A (en) | 1969-04-28 |
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