EP0010485A1 - Korrosionsinhibitor-Zusammensetzung, Verfahren zu ihrer Herstellung und ihre Verwendung zum Schutz von Metalloberflächen - Google Patents

Korrosionsinhibitor-Zusammensetzung, Verfahren zu ihrer Herstellung und ihre Verwendung zum Schutz von Metalloberflächen Download PDF

Info

Publication number
EP0010485A1
EP0010485A1 EP79400727A EP79400727A EP0010485A1 EP 0010485 A1 EP0010485 A1 EP 0010485A1 EP 79400727 A EP79400727 A EP 79400727A EP 79400727 A EP79400727 A EP 79400727A EP 0010485 A1 EP0010485 A1 EP 0010485A1
Authority
EP
European Patent Office
Prior art keywords
composition according
group
alkylene
acid derivative
water
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.)
Granted
Application number
EP79400727A
Other languages
English (en)
French (fr)
Other versions
EP0010485B1 (de
Inventor
Francis Moran
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Union Chimique Et Industrielle De L'ouest Sa SA
Original Assignee
Union Chimique Et Industrielle De L'ouest Sa SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FR7829312A external-priority patent/FR2453911A1/fr
Priority claimed from FR7916763A external-priority patent/FR2460338A2/fr
Application filed by Union Chimique Et Industrielle De L'ouest Sa SA filed Critical Union Chimique Et Industrielle De L'ouest Sa SA
Priority to AT79400727T priority Critical patent/ATE1020T1/de
Publication of EP0010485A1 publication Critical patent/EP0010485A1/de
Application granted granted Critical
Publication of EP0010485B1 publication Critical patent/EP0010485B1/de
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors

Definitions

  • the present invention relates, as a new industrial product, to a corrosion-inhibiting composition. It also relates to its preparation process and its application in the protection of metal surfaces, in particular with respect to corrosion in the presence of water in liquid or vapor form.
  • Such protective packaging can be carried out using numerous mineral substances, such as phosphates, polyphosphates, chroma-tes, silicates, nitrites, sulfites etc., or organic, such as thiols, thiazols, amines, tannins etc. and selected depending on the characteristics of the water used and the installations themselves.
  • mineral substances such as phosphates, polyphosphates, chroma-tes, silicates, nitrites, sulfites etc.
  • organic such as thiols, thiazols, amines, tannins etc.
  • amines having a molecular weight of less than 300 such as ammonia, hydrazine, alkylamines (in particular C 1 -C 4 ), mor p h oline, benzylamine, cyclohexylamine, alkanolamines (see in particular the published French patent application No. 2 310 420) and polyalkylene polyamines (see in particular US Pat. Nos. 3,069,225 and 2,857,333 and Dutch Nos. 100,963), and their water-soluble salts obtained in particular by stoichiometric neutralization using aminophosphonic acids described in the above documents or polyphosphonic acids.
  • fatty C 12 -C 22 alkylamines in particular dehydroabietylamine, laurylamine and stearylamine, and their acid addition salts with HC1 and CH 3 COOH, as well as aliphatic polyamines with long chains called "fatty polyamines" (cf. French patent No. 1,435,023) such as stearylaminopropyleneamine.
  • fatty polyamines cf. French patent No. 1,435,023
  • These fatty alkylamines and these fatty polyamines have the disadvantage of leading to insufficient inhibition of corrosion by water, since the loss of thickness of the metallic surfaces (in particular of Fe or Cu) is of the order of 80 to 100 / u / year under the best conditions of use.
  • the inhibitors of the prior art and their salts best lead to a loss of thickness of the order of 80 to 150 ⁇ / year.
  • the object of the present invention is to propose a new technical solution for solving the problem of inhibiting corrosion of metal surfaces, which is different from those of the prior art.
  • Another object of the invention is to propose a new inhibiting composition having an anti-corrosion power greater than that of the means which have been previously recommended. Indeed, in very many cases, rates of residual corrosion by water (loss of thickness from 80 to 150 ⁇ / year) are still considered too high with regard to the costs of repair and maintenance of the installations, as well than with regard to production or operating stoppages that these repairs or replacements very often cause. Thus compared to the solution of published French patent application no.
  • a new inhibitory composition which contains at least one polyamine and at least one derivative of alkylene phosphonic acid, and which makes it possible to achieve, for the metallic surfaces which it is desired to protect in particular with respect to water, losses of thickness less than or equal to 50 ⁇ / year.
  • aminoalkylenephosphonic acid derivative is meant here the acids, salts and esters having in their molecule at least one fragment: (where the alkylene group has a linear or branched hydrocarbon chain, and the dotted lines represent bonds with other groups) as indicated in French Patent No. 1,430,798.
  • alkylene polyphosphonic acid a compound having at least two phosphonic functions and which is in particular chosen from the group consisting of alkylene polyphosphonic acids, their esters and their mineral salts (such as in particular the metallic and ), the alkylene chain comprising no amino group.
  • polyamines of formula I which are suitable, mention may in particular be made of dodecyltri (aminopropylene) amine, dodecyltetra (aminopropylene) amine, hexadecyltri (aminopropylene) amine, hexadecenyltetra (aminapropylene) amine, octadecyl (aminopropylene) amine, octadecylpenta) octadecenyltetra (aminopropylene) -amine, octadecyltri (aminopropylene) amine, octadecenylhexa (aminopropylene) amine and hexadecylhepta (aminopropylene) amine,
  • the amines of formula I can be used as they can be obtained commercially, alone or mixed together, in their pure or technical forms. Polyamines prepared from fatty acids of animal, vegetable or synthetic origin can also be used. Among the polyamines sold which are suitable, mention may in particular be made of the products known under the brand names DUOMEEN, DINORAM, TRINORAM, POLYRAM, LILAMIN and CEMULCAT which contain at least one polyamine I having a molecular weight greater than or equal to 320.
  • acids of formula II include amino-tri acids (methylphospho amino) (amino-tri (ethylphosphonic), amino-tri (propylphosphonic) and amino-tri (butylphosphonic), amino-tri [(a, a-dimethyl) methylphosphonic].
  • acids of formula III non-limiting examples that may be mentioned include ethylenediaminotetra- (methylphosphonic), propylenediaminotetra (methylphosphonic) and hexamethylenediaminotetra (methylphosphonic) acids.
  • acids of formula V include diethoxypropylaminodi- (methylphosphonic), undecaethoxypropylaminodi (ethylphosphonic) and pentapropoxypropylaminodi (methylphosphonic) acids.
  • alkylene phosphonic acids corresponding to formulas II to VI above can be chemically pure products, or technical products normally manufactured by industry and sold in liquid, pasty or pulverulent form, or also in the form of aqueous solutions at all concentrations, without the choice of one of these forms of presentation being able to constitute any limitation to the present invention.
  • alkylenephosphonic acids placed on the market in the form of aqueous solutions will be preferred.
  • composition according to the invention will contain (a) 5 to 80 parts by weight of polyamine I and (b) 20 to 95 parts by weight of the alkylenephosphonic acid derivative and, preferably, (a) 15 to 70 parts by weight of polyamine I and (b) 30 to 85 parts by weight of alkylenephosphonic acid derivative of formulas II to VI.
  • the process for preparing the corrosion inhibiting composition is carried out according to a method known per se which consists in mixing one or more polyamines 1 with one or more derivatives of alkylene phosphonic acid.
  • a method known per se which consists in mixing one or more polyamines 1 with one or more derivatives of alkylene phosphonic acid.
  • the selected polyamine or polyamines are introduced into the liquid state, by sufficient heating, which are gradually introduced, with moderate stirring. , or bright, as the case may be, in an aqueous solution of the alkylenephosphonic acid (s) chosen and previously heated to a temperature lower than that of the polyamine.
  • the mixture which is obtained may be in the form of a gel, or a paste, or a wax.
  • the polyamine (s) will be melted at a temperature between approximately 30 and approximately 85 ° C. and poured into the alkylene phosphonic acid (s) brought to a temperature comprised between approximately 15 and approximately 60 ° C.
  • mixtures with higher softening points will be preferred as corrosion inhibitors with respect to metal surfaces subjected to high temperatures, such as for example those constituting the tubes of steam boilers, or superheaters, or else those constituting the cooling circuits of the ovens of the metallurgical and steel industries.
  • the pasty or gelled compositions produced according to the invention can be introduced using a positive displacement piston pump, as is commercially available, either as is in the water of industrial or real estate circuits. to protect, is also previously emulsified, or dispersed in a larger amount of water using one or more commercial surface-active substances and known to those skilled in the art as capable of dispersing fatty polyamines.
  • the amounts of substances with surface-active properties used for this purpose depend on the commercial aspect which it is desired to give to such dispersions and should not constitute any limitation to the present invention.
  • this inhibitory composition can be, if necessary, in the form of an aqueous bath.
  • the substances with surface-active properties which are the most recommended are those included among the nonionic and / or cationic surfactants preferably.
  • non-ionic substances that may be mentioned are ethoxylated or propoxylated fatty acids and alcohols, ethoxylated fatty monoamines, fatty acid or alcohol esters, aliphatic amine oxides, esters sorbitol, etc., and among the so-called cationic substances, amine salts, quaternary ammonium salts, condensation products of ethylene or propylene oxide on fatty polyamines.
  • Stable dispersions in water can be obtained in particular with known industrial products chosen from those which have brand names: NORAMOX, ETHOMEEN, DINORAMOX, ETHODUOMEN, ETHOQUAD, ARQUAD, NORAMIUM, NOXAMINE, ADOGEN, ELFAPUR, ARONOX etc.
  • aminotri (methylenephosphonic acid) anhydrous corresponding to the general formula (II) above, at a homogeneous temperature of approximately 30 ° C.
  • 500 g of oleylaminopropyleneamine, of technical industrial quality, corresponding to the general formula (I) above, and previously liquefied, and maintained during the introduction, are gradually poured into the warm acid solution, with moderate mechanical stirring. the temperature of about 45 ° C.
  • the pasty composition thus obtained which has a solubility of less than 1% by weight in distilled water, constitutes an excellent corrosion inhibitor according to the invention, as will be seen below.
  • 500 g of an aqueous solution at 60% by weight of hexylidene-1,1-diphosphonic acid, therefore containing 300 g, are placed in a glass container, or in any other material which is not liable to be damaged by acids.
  • 250 g of oleyltri (aminopropylene) amine, of industrial quality, corresponding to general formula I above, and previously liquefied at a temperature of about 40 ° C. are gradually poured into the acid solution, with vigorous stirring.
  • the circuit mainly made of glass, with a total capacity of 19.6 1, surmounted by an expansion vessel open to the open air, also made of glass, of 5 1 capacity, is fitted with a tap. adjustable drain, usable either discontinuously for heating tests or continuously for cooling tests.
  • the circulation rate of 1.6 m 3 / h is provided by a centrifugal pump (in particular a centrifugal pump as manufactured by HALBERG GmbH of Ludwigshafen, RFA) and controlled using a rotameter.
  • the straight sections of the circuit are made of industrial glass tubes, their diameter is 40 mm and their total length is 3 m.
  • Heating cords electrics wound on the straight sections ensure the maintenance of the temperature if desired by means of a regulation device.
  • test pieces for weight loss measurements are of hollow cylindrical shape, 50 mm in length, 21.3 to 22 min outside diameter, and 14.8 to 17 mm inside diameter, and develop an external surface of 33 , 45 to 34.55 cm 2 , in contact with the aggressive medium, for an average weight of 72.5 g for steel test pieces, 69.0 g for copper test pieces and 21.2 g for test pieces in aluminium.
  • the metal test pieces are polished using a soft commercial abrasive, washed with demineralized water, dried with acetone and weighed very exactly to ⁇ 1 x 10 -4 g. They are then mounted in series, three by three, each of different metal, separated and held together by an appropriate Teflon fixing system, then introduced horizontally into a straight glass section of the circuit. At the end of the tests, they are removed from the circuit, brushed using a soft brush to remove the corrosion products, washed with demineralized water, dried with acetone and weighed very exactly at + 1 x 10 -4 g.
  • the tests were carried out with two varieties of water, namely raw water (raw water Al for the inhibiting compositions of examples 1-3, and raw water A2 for the inhibiting compositions of examples 4-6) and softened water ( softened water B1 for the inhibitor compositions of Examples 1-3, and softened water B2 for the inhibitor compositions of Examples 4-6, the softened waters Bl and respectively B2 being obtained from the raw waters Al and respectively B2 by passage over exchange resin ionic, cationic type in sodium cycle).
  • raw water raw water Al for the inhibiting compositions of examples 1-3, and raw water A2 for the inhibiting compositions of examples 4-6
  • softened water softened water B1 for the inhibitor compositions of Examples 1-3
  • softened water B2 for the inhibitor compositions of Examples 4-6
  • the raw waters A1 and A2 (drinking water distributed by the city of Paris) were used as such for the corrosion tests of the "cooling" type, and the softened waters Bl and B2 were used for the corrosion tests of the "heater”.
  • Tables II to V relate to the weight loss measurements, and Tables IV and V to the potentiostatic measurements to assess the corrosion rates (expressed in / u / year).
  • the circuit was modified by the introduction into its straight section of a hollow steel probe, 240 mm in length and 28 mm in outside diameter, provided with an electric heating resistor adjustable to the using a rheostat.
  • the metal test pieces intended for weight loss measurements and the "CORRATER" probe are kept as for the "Heating" type tests.
  • the circuit is filled, then continuously supplied, with raw water from the city of Paris, having the characteristics indicated in Table I, and at a rate of approximately 20 l per hour, resulting in a renewal of the water in the circuit. every hour on average.
  • the purge is adjusted continuously so as to keep the water level in the expansion tank constant.
  • the pasty inhibitor according to the compositions of the invention, is simply immersed in the expansion vessel using a cotton cloth sachet.
  • the water temperature maintained in forced circulation by the centrifugal pump, and measured using a thermometer placed downstream of the heated probe, stabilizes at 50 ° C + 5 ° C.
  • the duration of each test is 15 days without and with the inhibitors of Examples 1 to 5 above.
  • the same measurements as for the "Heating" type tests are carried out, with the difference, however, that at the end of tests, the cylindrical samples in steel, copper and aluminum, as well as the heated steel probe, are washed, before brushing, using a dilute solution of passivated sulfamic acid, in order to remove any deposits of mineral salts which may come from the hardness of the raw water which the phosphonic acids, present in possibly insufficient amounts in the compositions according to the invention, would not have prevented
  • Tables VI to IX relate to weight loss measurements and Tables VIII and IX to potentiostatic measurements to assess the corrosion rates.
  • compositions according to the invention do not require an adjustment of the pH of the corrosive medium or the addition of specific inhibitors with respect to copper in particular. It is finally remarkable that at doses of the order of 5 parts per million, the compositions according to the invention exhibit a corrosion inhibiting power very much greater than the inhibiting powers of each of their constituents taken separately, at doses substantially more high.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
EP79400727A 1978-10-13 1979-10-09 Korrosionsinhibitor-Zusammensetzung, Verfahren zu ihrer Herstellung und ihre Verwendung zum Schutz von Metalloberflächen Expired EP0010485B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79400727T ATE1020T1 (de) 1978-10-13 1979-10-09 Korrosionsinhibitor-zusammensetzung, verfahren zu ihrer herstellung und ihre verwendung zum schutz von metalloberflaechen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR7829312A FR2453911A1 (fr) 1978-10-13 1978-10-13 Composition inhibitrice de corrosion, son procede de preparation et son application dans la protection des surfaces metalliques
FR7829312 1978-10-13
FR7916763 1979-06-28
FR7916763A FR2460338A2 (fr) 1979-06-28 1979-06-28 Composition inhibitrice de corrosion, son procede de preparation et son application dans la protection des surfaces metalliques

Publications (2)

Publication Number Publication Date
EP0010485A1 true EP0010485A1 (de) 1980-04-30
EP0010485B1 EP0010485B1 (de) 1982-05-12

Family

ID=26220801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400727A Expired EP0010485B1 (de) 1978-10-13 1979-10-09 Korrosionsinhibitor-Zusammensetzung, Verfahren zu ihrer Herstellung und ihre Verwendung zum Schutz von Metalloberflächen

Country Status (7)

Country Link
US (1) US4276089A (de)
EP (1) EP0010485B1 (de)
BR (1) BR7906560A (de)
CA (1) CA1122394A (de)
DD (1) DD146629A5 (de)
DE (1) DE2962827D1 (de)
OA (1) OA06353A (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032226A1 (de) 1980-08-27 1982-04-01 Henkel KGaA, 4000 Düsseldorf Verfahren und mittel zum passivieren von eisen- und stahloberflaechen
ATE27832T1 (de) * 1983-08-03 1987-07-15 Ouest Union Chim Ind Korrosionsinhibierende zusammensetzung zum schuetzen von metalloberflaechen einer anlage, die wasser als thermisches oder energetisches fluidum verwendet, und verfahren zum schuetzen dieser oberflaeche.
US4649025A (en) * 1985-09-16 1987-03-10 W. R. Grace & Co. Anti-corrosion composition
US5266722A (en) * 1988-11-09 1993-11-30 W. R. Grace & Co.-Conn. Polyether bis-phosphonic acid compounds
US5017306A (en) * 1988-11-09 1991-05-21 W. R. Grace & Co.-Conn. Corrosion inhibitor
US4911887A (en) * 1988-11-09 1990-03-27 W. R. Grace & Co.-Conn. Phosphonic acid compounds and the preparation and use thereof
US4981648A (en) * 1988-11-09 1991-01-01 W. R. Grace & Co.-Conn. Inhibiting corrosion in aqueous systems
US4994195A (en) * 1989-06-21 1991-02-19 Edmondson James G Inhibitor treatment program for chlorine dioxide corrosion
ES2655241T3 (es) 2013-03-01 2018-02-19 General Electric Company Procedimientos de inhibición de la corrosión en compresores de aire de turbinas de gas
PL3256420T3 (pl) 2015-02-11 2025-09-01 Cytec Industries Inc. Zastosowanie zmodyfikowanych aminowych inhibitorów kamienia w wytwarzaniu kwasu fosforowego w procesie mokrym
EP3260576B1 (de) 2016-06-22 2019-01-30 Kurita Water Industries Ltd. Wässrige öl-in-wasser-emulsionen aus organischen aminen
JP6735717B2 (ja) * 2017-09-21 2020-08-19 栗田工業株式会社 蒸気による加熱効率向上方法及び抄紙方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069225A (en) * 1960-01-27 1962-12-18 Gen Mills Inc Method of inhibiting corrosion
US3523894A (en) * 1966-07-18 1970-08-11 Sun Oil Co Corrosion inhibitors
FR2310420A1 (fr) * 1975-05-07 1976-12-03 Henkel & Cie Gmbh Produits anticorrosion pour l'utilisation dans des installations comportant des circuits d'eau
FR2313463A1 (fr) * 1975-06-02 1976-12-31 Monsanto Co Procede d'inhibition de la corrosion de metaux a l'aide de 1,2-ethane-diphosphonates

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2771417A (en) * 1952-04-30 1956-11-20 Nat Aluminate Corp Inhibition of corrosion in return steam condensate lines
US2857333A (en) * 1956-06-20 1958-10-21 Universal Oil Prod Co Corrosion inhibitors
FR1435020A (fr) 1965-02-16 1966-04-15 Pechiney Saint Gobain Procédé de chloration du polychlorure de vinyle
US3505238A (en) * 1965-03-29 1970-04-07 Calgon C0Rp Methods and compositions for inhibiting scale in saline water evaporators
DE1767454C2 (de) * 1968-05-11 1983-01-27 Henkel KGaA, 4000 Düsseldorf Verfahren zum Korrosions- und Versteinungsschutz in Warm- und Heißwassersystemen
US3671448A (en) * 1970-09-10 1972-06-20 Monsanto Co Methods of scale inhibition using substoichiometric amounts of amino alcohol and phosphonic acids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069225A (en) * 1960-01-27 1962-12-18 Gen Mills Inc Method of inhibiting corrosion
US3523894A (en) * 1966-07-18 1970-08-11 Sun Oil Co Corrosion inhibitors
FR2310420A1 (fr) * 1975-05-07 1976-12-03 Henkel & Cie Gmbh Produits anticorrosion pour l'utilisation dans des installations comportant des circuits d'eau
FR2313463A1 (fr) * 1975-06-02 1976-12-31 Monsanto Co Procede d'inhibition de la corrosion de metaux a l'aide de 1,2-ethane-diphosphonates

Also Published As

Publication number Publication date
US4276089A (en) 1981-06-30
OA06353A (fr) 1981-06-30
DE2962827D1 (en) 1982-07-01
DD146629A5 (de) 1981-02-18
BR7906560A (pt) 1980-06-24
CA1122394A (en) 1982-04-27
EP0010485B1 (de) 1982-05-12

Similar Documents

Publication Publication Date Title
EP0010485B1 (de) Korrosionsinhibitor-Zusammensetzung, Verfahren zu ihrer Herstellung und ihre Verwendung zum Schutz von Metalloberflächen
FR2482138A1 (fr) Procede et composition pour inhiber la corrosion
EP0233110B1 (de) Verwendung eines Salzes zum Beeinflussen des Fliessverhaltens verdickter Zusammensetzungen
JPH0143838B2 (de)
CN111286740B (zh) 用于抑制腐蚀的组合物和方法
JPS58177479A (ja) 水性システムの腐食および沈積抑制方法および組成物
JPS585264B2 (ja) 腐蝕防止剤
EP0710733B1 (de) Mischung zur Korrosionshemmung von Metallen
CN111051251B (zh) 抑制腐蚀和结垢的组合物和方法
EP0065609B1 (de) Korrosionshemmende Zusammensetzung, Verfahren zu ihrer Herstellung und ihre Anwendung auf dem Gebiet des Schutzes von Metalloberflächen
AU623559B2 (en) N,n-bis-phosphonomethyl taurine n-oxide and water soluble salts thereof
EP0102284B1 (de) Lösung und Verfahren zur chemischen Konversion metallischer Oberflächen
CA1223686A (fr) Agent hydrosoluble de complexation des cations metalliques compose de terpolymeres acryliques disposant d'un haut pouvoir complexant et d'un effet de seuil eleve
FR2512072A1 (fr) Composition et procede d'inhibition de la corrosion par l'eau des substrats metalliques
EP1418253B1 (de) Kesselstein- und Korrosionsinhibitor und Verfahren für Wasserkreisläufe
EP0774017B1 (de) Zusammensetzung zur verhuetung von korrosion und ablagerungen in waessrige systeme und verfahren zur herstellung dieser zusammensetzung
FR2460338A2 (fr) Composition inhibitrice de corrosion, son procede de preparation et son application dans la protection des surfaces metalliques
EP1129038B1 (de) Verbindung zur verhinderung von ablagerungen in rohrleitungen eines wasserversorgungssystems
FR2564478A1 (fr) Additifs aqueux inhibiteurs de corrosion et procede pour leur preparation
FR2707280A1 (fr) Composition aqueuse d'acide sulfamique épaissie.
US728258A (en) Incrustation preventive.
FR2630728A1 (fr) Agent inhibiteur d'entartrage et de corrosion pour le traitement des eaux et/ou milieux aqueux
BE702520A (de)
HK40028685B (en) Composition and method for inhibiting corrosion and scale
HK40028685A (en) Composition and method for inhibiting corrosion and scale

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE GB IT LU NL SE

17P Request for examination filed

Effective date: 19801015

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE GB IT LU NL SE

REF Corresponds to:

Ref document number: 1020

Country of ref document: AT

Date of ref document: 19820515

Kind code of ref document: T

REF Corresponds to:

Ref document number: 2962827

Country of ref document: DE

Date of ref document: 19820701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19821031

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19830926

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840630

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19841107

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19850919

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19851031

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19861009

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19870501

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881009

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19890701

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19891010

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19930830

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19941013

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19941031

EUG Se: european patent has lapsed

Ref document number: 79400727.8

Effective date: 19900705

BERE Be: lapsed

Owner name: UNION CHIMIQUE ET INDUSTRIELLE DE L'OUEST S.A.

Effective date: 19941031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19951031

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT