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filingDate 1984-02-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1984-09-12-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0118395-A2
titleOfInvention Process for inhibiting corrosion of metallic surfaces and/or scale deposits thereon
abstract A) vor dem Kontakt mit einer korrosiven oder kesselsteinbildenden Umgebung mitn i) einer Verbindung der Formel (I):n oder einem wasserlöslichen Salz (oder Teil-Ester oder Teil-Salz) davon, wo R, und R 2 gleich oder verschieden sind und jeweils Wasserstoff, eine geradkettige oder verzweigte C 1 -C 12 -Alkylgruppe (gegebenenfalls substituiert durch eine oder mehrere Hydroxy- und/oder Carboxylgruppen und/oder gegebenenfalls unterbrochen durch ein oder mehrere stoffatome, eine geradkettige oder verzweigte C 3 -C 12 Alkenylgruppe oder eine C 7 -C 15 -Aralkytgruppe ist, oder wo R, und R 2 zusammen mit dem Stickstoffatom, an das sie jeweils gebunden sind, einen gegebenenfalls substituierten heterocyclischen Ring bilden können; R 3 Wasserstoff, eine geradkettige oder verzweigte C 1 -C 12 Alkylgruppe oder eine gegebenenfalls substituierte C 6 -C 10 Arylgruppe ist; und wo R 4 Wasserstoff oder eine geradkettige oder verzweigte C 1 -C 4 Alkylgruppe ist und gegebenenfallsn ii) einer Metallion-Komponente b) wie hiernach definiert, und/oder B) während des Kontaktes mit einem wässerigen System, welches fähig ist, eine Metalloberfläche zu korrodieren oder darauf Kesselstein abzulagern, mit a) einer Verbindung der Formel 1 oder einem wasserlöslichen Salz (oder Teil-Salz) davon; und gegebenenfalls b) einem Metallion, welches synergistisch die Metall-Konditionierung steigert, wobei letztere auch schon durch eine Verbindung der Formel I und ein Metallion bewirkt wird, behandelt werden. Process for conditioning metal surfaces to inhibit their corrosion and / or scale deposition thereon by said surfaces A) before contact with a corrosive or scale-forming environment i) a compound of formula (I): or a water-soluble salt (or partial ester or partial salt) thereof, where R 1 and R 2 are identical or different and each is hydrogen, a straight-chain or branched C 1 -C 12 alkyl group (optionally substituted by one or more hydroxy and / or carboxyl groups and / or optionally interrupted by one or more atoms, a straight-chain or branched C 3 -C 12 alkenyl group or a C 7 -C 15 aralkyt group, or where R, and R 2 together with the nitrogen atom to which they are each bonded, can form an optionally substituted heterocyclic ring; R 3 is hydrogen, a straight-chain or branched C 1 -C 12 alkyl group or an optionally substituted C 6 -C 10 aryl group; and where R 4 is hydrogen or a straight-chain or branched C 1 -C 4 alkyl group and optionally ii) a metal ion component b) as defined hereinafter, and / or B) during contact with an aqueous system which is capable of corroding or depositing scale on a metal surface, with a) a compound of formula 1 or a water-soluble salt (or partial salt) thereof; and optionally b) a metal ion which synergistically increases the metal conditioning, the latter also being brought about by a compound of the formula I and a metal ion.
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