EP0963423A1 - Corrosion-inhibited de-icing agent - Google Patents

Corrosion-inhibited de-icing agent

Info

Publication number
EP0963423A1
EP0963423A1 EP98907928A EP98907928A EP0963423A1 EP 0963423 A1 EP0963423 A1 EP 0963423A1 EP 98907928 A EP98907928 A EP 98907928A EP 98907928 A EP98907928 A EP 98907928A EP 0963423 A1 EP0963423 A1 EP 0963423A1
Authority
EP
European Patent Office
Prior art keywords
alkali metal
component
alkaline earth
deicing
corrosion
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.)
Withdrawn
Application number
EP98907928A
Other languages
German (de)
French (fr)
Inventor
Wilfried Becker
Achim Stankowiak
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.)
Clariant Produkte Deutschland GmbH
Original Assignee
Clariant GmbH
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
Application filed by Clariant GmbH filed Critical Clariant GmbH
Publication of EP0963423A1 publication Critical patent/EP0963423A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
    • C09K3/185—Thawing materials
    • 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
    • C23F11/18—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 inorganic inhibitors
    • C23F11/187—Mixtures of inorganic inhibitors
    • C23F11/188—Mixtures of inorganic inhibitors containing phosphates

Definitions

  • the invention relates to a corrosion - inhibited deicing agent based on
  • Alkali metal halides or alkaline earth metal halides or a mixture thereof are Alkali metal halides or alkaline earth metal halides or a mixture thereof.
  • the invention further relates to a method for melting snow and ice
  • Traffic areas Snow and / or ice on roads, cycle paths, sidewalks, bridges, sports fields, airfields and the like (hereinafter referred to as traffic areas) lead to a significant impairment of the traffic flow and traffic safety. It has therefore long been known to apply a means for melting or thawing snow and ice to such surfaces.
  • alkali and alkaline earth metal salts of inorganic or organic acids are described as deicing agents in the prior art, for example the salts of hydrohalic acids such as sodium chloride and calcium chloride and the salts of formic acid or acetic acid such as sodium formate, calcium formate, sodium acetate and magnesium acetate.
  • hydrohalic acids such as sodium chloride and calcium chloride
  • formic acid or acetic acid such as sodium formate, calcium formate, sodium acetate and magnesium acetate.
  • sodium chloride and calcium chloride in particular are available in large quantities, cheaply and also very effectively in thawing and melting ice and snow.
  • the deicing agent according to the invention essentially consists of a) 87 to 99.45% by weight, preferably 92 to 97.9% by weight, of an alkali metal halide and / or alkaline earth metal halide, b) 0.5 to 10% by weight, preferably 2 to 7% by weight of an alkali metal silicate and c) 0.05 to 3% by weight, preferably 0.1 to 1% by weight of an alkali metal phosphate,
  • Component a) is preferably an alkali metal and / or alkaline earth metal chloride.
  • the alkali metal is preferably sodium or potassium and the alkaline earth metal is calcium or magnesium. Of the water-soluble alkali and alkaline earth metal halides, the former are preferred.
  • Component a) is accordingly preferably NaCl or CaCl 2 or a mixture thereof and particularly preferably NaCl.
  • Component b) is a water-soluble alkali metal silicate, the alkali metal again preferably being sodium or potassium.
  • Suitable representatives are the orthosilicates (mono-, di-, tri- and tetrabasic), disilicates to tetrasilicates and / or the water-soluble metasilicates, which are preferred.
  • Component c) is a water-soluble alkali metal salt of phosphoric acid. It can be a mono-, di- or tribasic alkali metal phosphate, whereby the Alkali metal is preferably sodium or potassium.
  • the deicing agent according to the invention is produced by mixing the liquid or solid components together.
  • the mixing of the solid components can be improved by compacting or by dissolving the components beforehand and then spray drying.
  • the deicing agent can thus be used in solid form, for example as a powder or granulate, or as an aqueous solution.
  • the amount of the three and optionally further expedient components in the aqueous deicing agent (total concentration) can vary within wide limits. It depends primarily on the solubility of the components in water. There should be an essentially clear solution.
  • the preferred concentration is 25 to 60% by weight, percentages by weight based on the weight of the solution. Concentrations that are at or close to the eutectic point are preferred in order to achieve a high level of frost protection.
  • the pH of the aqueous deicing composition is generally from 7 to 10. If the pH mentioned does not exist after the components have been mixed together, it will be adjusted to the desired value by adding preferably an alkali metal hydroxide such as sodium
  • the process according to the invention for melting snow and ice on traffic areas is characterized in that an effective amount of the deicing agent described (in solid or liquid form) is applied to the traffic area to be treated, that is to say an amount such that the desired removal of ice and / or snow is reached.
  • This amount depends primarily on the outside temperature and the amount of ice and / or snow present and is generally 10 to 100 g per m 2 of ice and / or snow-covered area, based on solids.
  • the liquid deicing agent can be applied, for example, with the aid of conventional spray vehicles.
  • the solid deicing agent can be applied with conventional spreading vehicles. The simultaneous use of liquid and solid agents is particularly effective.
  • the deicing agent according to the invention also has an unexpectedly high inhibition of metal corrosion, in particular steel corrosion. This obviously results from the combination of the specified phosphates and silicates in a certain amount in each case and from the fact that this inhibitor system is particularly effective in the case of alkali metal and / or alkaline earth metal halides.
  • the deicing compositions of Examples 1 to 4 and Comparative Experiments 1 to 4 are tested for steel corrosion.
  • the weighed test specimen is a ground and polished steel plate measuring 2.5 x 5.0 x 0.1 cm (steel C 45, corresponding to C 4130 Mil-S-18729).
  • the test specimen is placed in the deicing agent to be tested so that it is completely immersed.
  • the temperature of the test arrangement is kept at 35 ° C.
  • the test specimen is removed at specified intervals, brushed, rinsed and dried in accordance with ASTM F 483 and then weighed.
  • the change in weight, usually a removal, is given in the examples as mg / cm 2 per 24 hours.
  • the test specimens are also assessed visually. example 1
  • the results of the steel corrosion tests with and without inhibition are summarized in the following table.
  • the indicated removal values are mean values from two identical test series.
  • the test specimens from Examples 1 to 4 only showed tarnishing colors, but no rust.
  • rapid rust formation occurs with the non-inhibited NaCI solutions and slower rust formation with non-inhibited CaCI 2 solutions.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention concerns a de-icing agent which substantially comprises: a) between 87 and 99.45 wt % of an alkali metal halide and/or an alkaline earth metal halide; b) between 0.5 and 10 wt % of an alkali metal silicate; and c) between 0.05 and 3 wt % of an alkali metal phosphate. The agent can be used in solid form (powder, granulates and the like) or in the form of an aqueous solution. It ensures a short thawing time and protection against corrosion, in particular for steel.

Description

Korrosionsinhibiertes EnteisungsmittelCorrosion inhibited deicing agent
Die Erfindung betrifft ein korrosionsinhibiertes Enteisungsmittel auf der Basis vonThe invention relates to a corrosion - inhibited deicing agent based on
Alkalimetallhalogeniden oder Erdalkalimetallhalogeniden oder einer Mischung davon.Alkali metal halides or alkaline earth metal halides or a mixture thereof.
Die Erfindung betrifft ferner ein Verfahren zum Schmelzen von Schnee und Eis aufThe invention further relates to a method for melting snow and ice
Verkehrsflächen unter Verwendung dieses Mittels.Traffic areas using this agent.
Schnee und/oder Eis auf Straßen, Radfahrwegen, Gehwegen, Brücken, Sportplätzen, Flugplätzen und dergleichen (im folgenden Verkehrsflächen genannt) führen zu einer wesentlichen Beeinträchtigung des Verkehrsablaufes und der Verkehrssicherheit. Es ist deshalb schon seit langem bekannt, auf solchen Flächen ein Mittel zum Schmelzen oder Auftauen von Schnee und Eis aufzubringen.Snow and / or ice on roads, cycle paths, sidewalks, bridges, sports fields, airfields and the like (hereinafter referred to as traffic areas) lead to a significant impairment of the traffic flow and traffic safety. It has therefore long been known to apply a means for melting or thawing snow and ice to such surfaces.
Im Stand der Technik sind zahlreiche Alkali- und Erdalkalimetallsalze von anorganischen oder organischen Säuren als Enteisungsmittel beschrieben, zum Beispiel die Salze von Halogenwasserstoffsäuren wie Natriumchlorid und Calciumchlorid und die Salze von Ameisensäure oder Essigsäure wie Natriumformiat, Calciumformiat, Natriumacetat und Magnesiumacetat. Von diesen Enteisungsmitteln sind insbesondere Natriumchlorid und Calciumchlorid in großen Mengen erhältlich, billig und auch sehr wirksam im Auftauen und Schmelzen von Eis und Schnee.Numerous alkali and alkaline earth metal salts of inorganic or organic acids are described as deicing agents in the prior art, for example the salts of hydrohalic acids such as sodium chloride and calcium chloride and the salts of formic acid or acetic acid such as sodium formate, calcium formate, sodium acetate and magnesium acetate. Of these deicing agents, sodium chloride and calcium chloride in particular are available in large quantities, cheaply and also very effectively in thawing and melting ice and snow.
Gerade diese Salze wirken aber auf Metalle wie Eisen, Kupfer, Aluminium, Magnesium und dergleichen mehr oder weniger stark korrodierend, was im Hinblick auf Verkehrsmittel wie Autos, Motorräder, Flugzeuge und dergleichen besonders nachteilig ist. Es sind bereits Versuche unternommen worden, das erwähnte Korrosionsproblem mit Hilfe von Inhibitoren zu lösen. So wird in US-A-4 803 007 als Korrosionsinhibitor für NaCI eine Mischung aus einem wasserlöslichen Salz eines zweiwertigen Metalls und einem Alkalimetallpolyphosphat beschrieben.However, it is precisely these salts which have a more or less corrosive effect on metals such as iron, copper, aluminum, magnesium and the like, which is particularly disadvantageous with regard to means of transport such as cars, motorcycles, airplanes and the like. Attempts have already been made to solve the corrosion problem mentioned with the aid of inhibitors. For example, US Pat. No. 4,803,007 describes a mixture of a water-soluble salt of a divalent metal and an alkali metal polyphosphate as a corrosion inhibitor for NaCl.
Es wurde nun ein sehr wirksames Inhibitorsystem für Alkalimetall- und auch für Erdalkalimetallhalogenide gefunden, das keine divalenten Metallsalze erfordert, sondern aus Alkalimetallsalzen allein besteht, und zwar aus Alkalimetallsiiicaten und Alkalimetallphosphaten in einer jeweils speziellen Gewichtsmenge.A very effective inhibitor system for alkali metal and also for alkaline earth metal halides has now been found, which does not require divalent metal salts, but instead consists of alkali metal salts alone, namely of alkali metal silicates and alkali metal phosphates in a particular amount by weight.
Das erfindungsgemäße Enteisungsmittel besteht im wesentlichen aus a) 87 bis 99,45 Gew.-%, vorzugsweise 92 bis 97,9 Gew.-%, von einem Alkalimetallhalogenid und/oder Erdalkalimetallhalogenid, b) 0,5 bis 10 Gew.-%, vorzugsweise 2 bis 7 Gew.-%, von einem Alkalimetallsilicat und c) 0,05 bis 3 Gew.-%, vorzugsweise 0,1 bis 1 Gew.-%, von einem Alkalimetallphosphat,The deicing agent according to the invention essentially consists of a) 87 to 99.45% by weight, preferably 92 to 97.9% by weight, of an alkali metal halide and / or alkaline earth metal halide, b) 0.5 to 10% by weight, preferably 2 to 7% by weight of an alkali metal silicate and c) 0.05 to 3% by weight, preferably 0.1 to 1% by weight of an alkali metal phosphate,
Gewichtsprozente bezogen auf das Mittel.Percentages by weight based on the average.
Die Komponente a) ist vorzugsweise ein Alkalimetallund/oder Erdalkalimetallchlorid. Das Alkalimetall ist vorzugsweise Natrium oder Kalium und das Erdalkalimetall Calcium oder Magnesium. Von den wasserlöslichen Alkali- und Erdalkalimetallhalogeniden sind die ersteren bevorzugt. Die Komponente a) ist demnach vorzugsweise NaCI oder CaCI2 oder eine Mischung davon und besonders bevorzugt NaCI.Component a) is preferably an alkali metal and / or alkaline earth metal chloride. The alkali metal is preferably sodium or potassium and the alkaline earth metal is calcium or magnesium. Of the water-soluble alkali and alkaline earth metal halides, the former are preferred. Component a) is accordingly preferably NaCl or CaCl 2 or a mixture thereof and particularly preferably NaCl.
Die Komponente b) ist ein wasserlösliches Alkalimetallsilicat, wobei das Alkalimetall wiederum vorzugsweise Natrium oder Kalium ist. Geeignete Vertreter sind die orthosilicate (mono-, di-, tri- und tetrabasisch), Disilicate bis Tetrasilicate und/oder die wasserlöslichen Metasilicate, die bevorzugt sind.Component b) is a water-soluble alkali metal silicate, the alkali metal again preferably being sodium or potassium. Suitable representatives are the orthosilicates (mono-, di-, tri- and tetrabasic), disilicates to tetrasilicates and / or the water-soluble metasilicates, which are preferred.
Die Komponente c) ist ein wasserlösliches Alkalimetallsalz der Phosphorsäure. Sie kann ein mono-, di- oder tribasisches Alkalimetallphosphat sein, wobei das Alkalimetall vorzugsweise Natrium oder Kalium ist.Component c) is a water-soluble alkali metal salt of phosphoric acid. It can be a mono-, di- or tribasic alkali metal phosphate, whereby the Alkali metal is preferably sodium or potassium.
Die Herstellung des erfindungsgemäßen Enteisungsmittels erfolgt durch Zusammenmischen der flüssigen oder festen Komponenten. Die Vermischung der festen Komponenten kann durch Kompaktieren oder durch vorheriges Auflösen der Komponenten und anschließende Sprühtrocknung verbessert werden. Das Enteisungsmittel kann also in fester Form, zum Beispiel als Pulver oder Granulat, oder als wäßrige Lösung eingesetzt werden. Die Menge der drei und gegebenenfalls weiteren zweckmäßigen Komponenten im wäßrigen Enteisungsmittel (Gesamtkonzentration) kann innerhalb weiter Grenzen variieren. Sie richtet sich vor allem nach der Löslichkeit der Komponenten im Wasser. Es soll eine im wesentlichen klare Lösung vorliegen. Die bevorzugte Konzentration liegt bei 25 bis 60 Gew.-%, Gewichtsprozente bezogen auf das Gewicht der Lösung. Zur Erzielung einer hohen Frostsicherheit sind Konzentrationen bevorzugt, die beim oder nahe beim eutektischen Punkt liegen. Der pH-Wert des wäßrigen Enteisungsmittels liegt im allgemeinen bei 7 bis 10. Sofern der genannte pH-Wert nach dem Zusammenmischen der Komponenten nicht ohnehin vorliegt, wird man ihn durch Zugabe von vorzugsweise einem Alkalimetallhydroxid wie Natrium- oder Kaliumhydroxid auf den gewünschten Wert einstellen.The deicing agent according to the invention is produced by mixing the liquid or solid components together. The mixing of the solid components can be improved by compacting or by dissolving the components beforehand and then spray drying. The deicing agent can thus be used in solid form, for example as a powder or granulate, or as an aqueous solution. The amount of the three and optionally further expedient components in the aqueous deicing agent (total concentration) can vary within wide limits. It depends primarily on the solubility of the components in water. There should be an essentially clear solution. The preferred concentration is 25 to 60% by weight, percentages by weight based on the weight of the solution. Concentrations that are at or close to the eutectic point are preferred in order to achieve a high level of frost protection. The pH of the aqueous deicing composition is generally from 7 to 10. If the pH mentioned does not exist after the components have been mixed together, it will be adjusted to the desired value by adding preferably an alkali metal hydroxide such as sodium or potassium hydroxide.
Das erfindungsgemäße Verfahren zum Schmelzen von Schnee und Eis auf Verkehrsflächen ist dadurch gekennzeichnet, daß eine wirksame Menge des beschriebenen Enteisungsmittels (in fester oder flüssiger Form) auf der zu behandelnden Verkehrsfläche aufgebracht wird, das heißt eine solche Menge, daß die angestrebte Beseitigung von Eis und/oder Schnee erreicht wird. Diese Menge hängt vor allem von der Außentemperatur und der vorhandenen Eis- und/oder Schneemenge ab und liegt im allgemeinen bei 10 bis 100 g pro m2 eis- und/oder schneebedeckter Fläche, bezogen auf Feststoff. Das Aufbringen des flüssigen Enteisungsmittels kann zum Beispiel mit Hilfe der üblichen Sprühfahrzeuge durchgeführt werden. Das Aufbringen des festen Enteisungsmittels kann mit üblichen Streufahrzeugen erfolgen. Besonders wirksam ist die gleichzeitige Anwendung von flüssigen und festen Mitteln. Das erfindungsgemäße Enteisungsmittel weist neben kurzer Auftauzeit auch eine unerwartet hohe Inhibierung der Metallkorrosion auf, insbesondere der Stahlkorrosion. Dies resultiert offensichtlich aus der Kombination der genannten Phosphate und Silicate in einer jeweils bestimmten Menge und daraus, daß dieses Inhibitorsystem gerade im Falle von Alkalimetall- und/oder Erdalkalimetallhalogeniden hochwirksam ist.The process according to the invention for melting snow and ice on traffic areas is characterized in that an effective amount of the deicing agent described (in solid or liquid form) is applied to the traffic area to be treated, that is to say an amount such that the desired removal of ice and / or snow is reached. This amount depends primarily on the outside temperature and the amount of ice and / or snow present and is generally 10 to 100 g per m 2 of ice and / or snow-covered area, based on solids. The liquid deicing agent can be applied, for example, with the aid of conventional spray vehicles. The solid deicing agent can be applied with conventional spreading vehicles. The simultaneous use of liquid and solid agents is particularly effective. In addition to a short thawing time, the deicing agent according to the invention also has an unexpectedly high inhibition of metal corrosion, in particular steel corrosion. This obviously results from the combination of the specified phosphates and silicates in a certain amount in each case and from the fact that this inhibitor system is particularly effective in the case of alkali metal and / or alkaline earth metal halides.
Die Erfindung wird nun anhand von erfindungsgemäßen Beispielen und Vergleichsbeispielen noch näher erläutert.The invention will now be explained in more detail with reference to examples and comparative examples according to the invention.
Die Enteisungsmittel der nachstehenden erfindungsgemäßen Beispiele 1 bis 4 und der Vergleichsbeispiele 1 bis 4 wurden durch Mischen der Komponenten hergestellt. Die angegebenen Prozentmengen der einzelnen Komponenten sind Gewichtsprozente.The deicing compositions of Examples 1 to 4 below and Comparative Examples 1 to 4 were prepared by mixing the components. The percentages given for the individual components are percentages by weight.
BeispieleExamples
Die Enteisungsmittel der Beispiele 1 bis 4 und der Vergleichsversuche 1 bis 4 werden bezüglich Stahlkorrosion getestet. Die Tests erfolgen nach ASTM F 483 (ASTM = American Society for Testing and Materials). Der gewogene Prüfkörper ist jeweils ein geschliffenes und poliertes Stahlplättchen der Dimension 2,5 x 5,0 x 0,1 cm (Stahl C 45, entsprechend C 4130 Mil-S-18729). Der Prüfkörper wird in das zu testende Enteisungsmittel eingelegt, so daß er vollständig eintaucht. Die Temperatur der Prüfanordnung wird bei 35°C gehalten. Der Prüfkörper wird nach festgelegten Zeitabständen herausgenommen, entsprechend ASTM F 483 gebürstet, gespült und getrocknet und anschließend gewogen. Die Gewichtsveränderung, im Regelfall ein Abtrag, wird in den Beispielen mit mg/cm2 pro 24 Stunden angegeben. Zusätzlich werden die Prüfkörper auch visuell beurteilt. Beispiel 1The deicing compositions of Examples 1 to 4 and Comparative Experiments 1 to 4 are tested for steel corrosion. The tests are carried out according to ASTM F 483 (ASTM = American Society for Testing and Materials). The weighed test specimen is a ground and polished steel plate measuring 2.5 x 5.0 x 0.1 cm (steel C 45, corresponding to C 4130 Mil-S-18729). The test specimen is placed in the deicing agent to be tested so that it is completely immersed. The temperature of the test arrangement is kept at 35 ° C. The test specimen is removed at specified intervals, brushed, rinsed and dried in accordance with ASTM F 483 and then weighed. The change in weight, usually a removal, is given in the examples as mg / cm 2 per 24 hours. The test specimens are also assessed visually. example 1
5,0 g Natriumchlorid5.0 g sodium chloride
0,2 g Natriummetasilicat0.2 g sodium metasilicate
0,02 g Trikalium-orthophosphat0.02 g tripotassium orthophosphate
94,78 ml Wasser94.78 ml water
Beispiel 2Example 2
15,0 g Natriumchlorid15.0 g sodium chloride
0,5 g Kaliummetasilicat0.5 g potassium metasilicate
0,06 g Trikalium-orthophosphat0.06 g tripotassium orthophosphate
84,44 ml Wasser84.44 ml of water
Beispiel 3Example 3
25,0 g Calciumchlorid25.0 g calcium chloride
1 ,0 g Kaliummetasilicat1.0 g of potassium metasilicate
0,5 g Trinatrium-orthophosphat0.5 g trisodium orthophosphate
73,5 ml Wasser73.5 ml of water
Beispiel 4Example 4
50,0 g Calciumchlorid50.0 g calcium chloride
2,2 g Natriummetasilicat2.2 g sodium metasilicate
0,8 g Trikalium-orthophosphat0.8 g tripotassium orthophosphate
47,0 ml Wasser47.0 ml water
Vergleichsbeispiel 1 (ohne Inhibitoren)Comparative Example 1 (without inhibitors)
5,0 g Natriumchlorid 95,0 ml Wasser Vergleichsbeispiel 2 (ohne Inhibitoren)5.0 g sodium chloride 95.0 ml water Comparative Example 2 (without inhibitors)
15,0 g Natriumchlorid 85,0 ml Wasser15.0 g sodium chloride 85.0 ml water
Vergleichsbeispiel 3 (ohne Inhibitoren)Comparative Example 3 (without inhibitors)
25,0 g Calciumchlorid 5,0 ml Wasser25.0 g calcium chloride 5.0 ml water
Vergleichsbeispiel 4 (ohne Inhibitoren)Comparative Example 4 (without inhibitors)
50,0 g Calciumchlorid 50,0 ml Wasser50.0 g calcium chloride 50.0 ml water
Die Ergebnisse der Stahlkorrosionstests mit und ohne Inhibierung sind in der folgenden Tabelle zusammengefaßt. Die angegebenen Abtragswerte sind jeweils Mittelwerte aus zwei gleichen Versuchsreihen. Die Prüfkörper aus den Beispielen 1 bis 4 zeigten nur Anlauffarben, aber keinerlei Rost. Dagegen tritt mit den nichtinhibierten NaCI-Lösungen rasche Rostbildung und mit nichtinhibierten CaCI2- Lösungen eine langsamere Rostbildung ein. The results of the steel corrosion tests with and without inhibition are summarized in the following table. The indicated removal values are mean values from two identical test series. The test specimens from Examples 1 to 4 only showed tarnishing colors, but no rust. In contrast, rapid rust formation occurs with the non-inhibited NaCI solutions and slower rust formation with non-inhibited CaCI 2 solutions.

Claims

Patentansprüche claims
1. Enteisungsmittel bestehend im wesentlichen aus a) 87 bis 99,45 Gew.-% von einem Alkalimetallhalogenid und/oder einem Erdalkalimetallhalogenid, b) 0,5 bis 10 Gew.-% von einem Alkalimetallsilicat und c) 0,05 bis 3 Gew.-% von einem Alkalimetallphosphat.1. deicing composition consisting essentially of a) 87 to 99.45 wt .-% of an alkali metal halide and / or an alkaline earth metal halide, b) 0.5 to 10 wt .-% of an alkali metal silicate and c) 0.05 to 3 wt .-% of an alkali metal phosphate.
2. Enteisungsmittel nach Anspruch 1 , bestehend im wesentlichen aus a) 92 bis 97,9 Gew.-% von einem Alkalimetallhalogenid und/oder einem Erdalkalimetallhalogenid, b) 2 bis 7 Gew.-% von einem Alkalimetallsilicat und c) 0,1 bis 1 Gew.-% von einem Alkalimetallphosphat.2. Deicing composition according to claim 1, consisting essentially of a) 92 to 97.9 wt .-% of an alkali metal halide and / or an alkaline earth metal halide, b) 2 to 7 wt .-% of an alkali metal silicate and c) 0.1 to 1% by weight of an alkali metal phosphate.
3. Enteisungsmittel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Komponente a) Natriumchlorid oder Calciumchlorid oder eine Mischung davon ist, die Komponente b) ein Alkalimetallmetasilicat und die Komponente c) ein mono-, di- oder tribasisches Alkalimetallphosphat ist.3. De-icing agent according to claim 1 or 2, characterized in that component a) is sodium chloride or calcium chloride or a mixture thereof, component b) is an alkali metal metasilicate and component c) is a mono-, di- or tribasic alkali metal phosphate.
4. Enteisungsmittel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Komponente a) Natriumchlorid, die Komponente b) ein Alkalimetallmetasilicat und die Komponente c) ein mono-, di- oder tribasisches Alkalimetallphosphat ist.4. Deicing composition according to claim 1 or 2, characterized in that component a) sodium chloride, component b) is an alkali metal metasilicate and component c) is a mono-, di- or tribasic alkali metal phosphate.
5. Verfahren zum Schmelzen von Eis und Schnee auf Verkehrsflächen, dadurch gekennzeichnet, daß eine wirksame Menge von dem Enteisungsmittel nach Anspruch 1 in fester Form oder in Form einer wäßrigen Lösung auf die Verkehrsflächen aufgebracht wird. 5. A method for melting ice and snow on traffic areas, characterized in that an effective amount of the deicing agent according to claim 1 is applied to the traffic areas in solid form or in the form of an aqueous solution.
EP98907928A 1997-01-23 1998-01-07 Corrosion-inhibited de-icing agent Withdrawn EP0963423A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19702242 1997-01-23
DE19702242A DE19702242A1 (en) 1997-01-23 1997-01-23 Corrosion-inhibited deicing agent based on alkali metal and / or alkaline earth metal halides and method for melting snow and ice on traffic areas using this agent
PCT/EP1998/000050 WO1998032811A1 (en) 1997-01-23 1998-01-07 Corrosion-inhibited de-icing agent

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EP0963423A1 true EP0963423A1 (en) 1999-12-15

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WO (1) WO1998032811A1 (en)

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WO1998032811A1 (en) 1998-07-30
US5922241A (en) 1999-07-13
DE19702242A1 (en) 1998-07-30
AU6613198A (en) 1998-08-18
CA2278529A1 (en) 1998-07-30

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