http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1056357-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_888c17427537b9cb8c9a63f20631067b |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25D11-38 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C25D11-38 |
| filingDate | 1963-10-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1967-01-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1056357-A |
| titleOfInvention | Electrochemical treatment of metal surfaces to form a protective coating of hydrated chromium oxide thereon |
| abstract | 1,056,357. Coating with chromium compounds, electrolytically. TOYO KOHAN CO. Ltd. Oct. 17, 1963 [Nov. 10, 1962], No. 41096/63. Heading C7B. A protective coating of hydrated chromium oxide is formed on a metal surface (e. g. of Fe, steel, Al or Al alloys) by electrolysis using the metal to be coated as cathode in an aqueous solution containing 40-100 g/1 of chromic acid and a water-soluble organic hydroxy compound, wherein chromium ion present is C 2 3 not more than 2À5 g/1, and C 2 6 20-150 parts by weight of Cr3,the solution also containing 0À1 -0À5 g/1 of H 2 SO 4 . The solution may also contain small amounts of fluorides, acidic fluorides, fluosilicates and fluoborates. Specified electrolysing conditions are a temperature of 40-70‹C., a current density of not less than 12À5 A/sq. dm. (e. g. 12À5-40 A/sq. dm.) and a time for treatment of 1-20 seconds. Prior to treatment the metal may be cleaned with alkalis, and acids and after treatment may be given a paint, varnish, lacquer or other organic finish e. g. a melamine coating (Example 1). Specified hydroxy compounds are methyl -, ethyl- and propyl alcohol; monoethanolamine, polyalcohols, such as ethylene glycol, propylene glycol, glycerol, di- and triethanolamine, pentaerythritol, sorbitol and mannitol, phenol, and phenol sulphonic acids such as phenol-2, 4-disulphonic acid, catechol-3 5-disulphonic acid, phenol-2, 4, 6, -trisulphonic acid, 2-naphthol-3, 6-disulphonic acid and 1, 8- dihydroxynaphthalene-3, 6-disulphonic acid. In cases where phenol sulphonic acids are employed it is not necessary to further add H 2 SO 4 , so far as the required concentration of H 2 SO 4 is obtained from the phenol sulphonic acids. Specified fluorine compounds are HF, NaF, KF, (NH 4 )F, NaHF 2 , KHF 2 , (NH 4 )HF 2 , H 2 SiF 6 , Na 2 SiF 6 , K 2 SiF 6 , (NH 4 ) 2 SiF 6 , HBF 4 , NaBF 4 , KBF 4 and (NH 4 ) 2 BF 4 . Examples 1-4, 6-8 and 10 relate to treating steel and Examples 5 and 9 relate to treating Al. Anodes used are lead, or alloys thereof with Ag, Sn, or Sb. The coatings are flexible and the coated sheet may be deep drawn without fracture. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2209177-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2209177-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4882183-A |
| priorityDate | 1962-11-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 49.