Published August 26, 1976
| Version v1
Patent
Process for the formation of an oxide layer to protect against corrosion on steel liable to corrosion
Description
Steel liable to corrosion is treated with air at 2000C, and then with superheated steam at 4800C in a fluidised bed furnace (Re > 900) for some hours in order to remove organic impurities. Slow cooling in an air flow up to 1000C provides a closed, non-porous and firm oxide layer of the Spinell type. There is no hydrogen embrittlement, and the meachanical properties are retained in full. The rate of corrosion in a UF6 atmosphere is reduced 50 times compared to untreated steel. The thickness of the layer can be varied between 0.7 and 3 μm by different durations of the treatment. Welded seams can be protected by this process without any loss of quality. (IHOE)
Availability note (English)
Available from Deutsches Patentamt, Muenchen, Germany, F.R.Abstract (German)
Korrosionsempfindliche Staehle werden zur Entferneung organischer Verunreinigungen mit Luft bei 2000C, dann mit ueberhitztem Wasserdampf bei 4800C in einem Wirbelschichtofen (Re > 900) einige Stunden behandelt. Langsames Abkuehlen im Luftstrom bis 1000C ergibt eine geschlossene, porenfreie und feste Oxidschicht vom Spinell-Typ. Wasserstoffversproedung tritt nicht ein, ebenso bleiben die mechanischen Eigenschaften voll erhalten. Die Korrosionsrate in einer UF6-Atomsphaere ist gegenueber unbehandelten Staehlen um das 50 fache herabgesetzt. Schichtdicken zwischen 0,7 und 3 μm koennen durch verschieden lange Behandlungsdauer eingestellt werden. Schweissnaehte koennen ohne Qualitaetseinbusse durch das Verfahren mitgeschuetzt werden. (IHOE)Additional details
Additional titles
- Original title (German)
- Verfahren zur Bildung einer korrosionsverhuetenden, oxidischen Schutzschicht auf korrosionsempfindlichen Staehlen
Publishing Information
- Imprint Pagination
- 2 p.
- IPC:
- Int. Cl. C23F 7/04.
- IPC
- Int. Cl. C23F 7/04.
- Patent number
- DE patent document 2503763/B/
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 13650005
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- AIR; CORROSION PROTECTION; CORROSION RESISTANCE; FLUIDIZED BEDS; FURNACES; HEATING; HIGH TEMPERATURE; LAYERS; OXIDES; PROTECTIVE COATINGS; STEAM; STEELS; SURFACE COATING; URANIUM FLUORIDES
- Descriptors DEC
- ACTINIDE COMPOUNDS; ALLOYS; CARBON ADDITIONS; CHALCOGENIDES; COATINGS; DEPOSITION; FLUIDS; FLUORIDES; FLUORINE COMPOUNDS; GASES; HALIDES; HALOGEN COMPOUNDS; IRON ALLOYS; IRON BASE ALLOYS; OXYGEN COMPOUNDS; TRANSITION ELEMENT ALLOYS; URANIUM COMPOUNDS