EP 0860517 B1 20011024 - Method for corrosion inhibiting water carrying metal systems
Title (en)
Method for corrosion inhibiting water carrying metal systems
Title (de)
Verfahren zur Korrosionsschutzbehandlung wasserführender Metallsysteme
Title (fr)
Procédé pour inhiber la corrosion dans des systèmes métalliques de conduites d'eau
Publication
Application
Priority
DE 19706410 A 19970219
Abstract (en)
[origin: EP0860517A1] Process for corrosion protective treatment of water-conveying metal systems involves separate dosing of phosphates and silicates into the water flow. Preferably, the silicates are dosed in amount 1.0-40 mg SiO2/l as an aqueous silicate solution with a modulus of 1.8-3.5 and a SiO2 concentration of ≥ 20 wt.%, while the phosphates are dosed in amount 0.1-6.7 mg PO4/l as an aqueous phosphate solution with a PO4 concentration of ≥ 20 wt.%. Also claimed is a medium which is used in the above corrosion protective treatment process and which contains, in aqueous solution, (a) alkali metal silicates, carbonates and hydrogen carbonates, with SiO2 and CO3 concentrations of 20 wt.% and 0.1 wt.%, respectively; or (b) alkali metal orthophosphates and polyphosphates in amount (based on total phosphate content, expressed as PO4) 25-75 wt.% each, the total PO4 concentration being ≥ 20 wt.%.
IPC 1-7
IPC 8 full level
C23F 11/18 (2006.01)
CPC (source: EP)
C23F 11/188 (2013.01)
Citation (examination)
- METAKORIN, Merkblatt 1.004 (Oktober 1995) Metakorin -TWH-6
- METAKORIN, Merkblatt 1.005 (Oktober 1995) Metakorin -TWH-8
- METAKORIN, Merkblatt 1.006(Oktober 1995) Metakorin -TWH-10
- WEHLE V.: "Carbonataktivierte Silikat-Kombinationen zur Restentsäuerung und gleichzeitigen Korrosionsinhibierung", NEUE DELIWA-ZEITSCHRIFT, no. 11, 1993, HANNOVER, pages 570 - 573
- WEHLE V.: "Einsatz von Silikaten in der Trinkwassernachaufbereitung", NEUE DELIWA-ZEITSCHRIFT, no. 11, 1979, HANNOVER, pages 94 - 96
- LIEBIG D.: "Einführung der Zentralen DosiErung eines Korrosionsinhibitors in der Düsseldorfer Wasserversorgung", FORUM STCDTE-HYGIENE, vol. 40, March 1989 (1989-03-01) - April 1989 (1989-04-01), pages 102 - 107
- "Internal Corrosion of Water Distribution Systems", 1985, AMERICAN WATER WORKS ASSOCIATION RESEARCH FOUNDATION, DENVER
- "Beschaffenheit des Wassers für Lebensmittelbetriebe", BUNDESGESETZBLATT, 1990, DE, pages 2614
Designated contracting state (EPC)
AT BE CH DE FR IT LI NL
DOCDB simple family (publication)
EP 0860517 A1 19980826; EP 0860517 B1 20011024; AT E207553 T1 20011115; DE 19706410 A1 19980827; DE 19706410 C2 20010405; DE 59801830 D1 20011129
DOCDB simple family (application)
EP 98101043 A 19980122; AT 98101043 T 19980122; DE 19706410 A 19970219; DE 59801830 T 19980122