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US 4,000,079 AGranted
Anticorrosives
AssigneeBayer Aktiengesellschaft
InventorsChristian Rasp, Artur Botta
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AssigneeBayer Aktiengesellschaft
InventorsChristian Rasp, Artur Botta
Estimating the term…
Corrosion-inhibiting aqueous solutions and corrosion inhibiting antifreeze agents based on glycols and aqueous solutions thereof are prepared by adding two such solutions and agents already containing conventional corrosion inhibitors, heterocyclic nitrogen compounds having the formula: ##STR1## wherein: R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring; R.sup.3, r.sup.4, r.sup.5 and R.sup.6 independently of one another are selected from the group of hydrogen, lower alkyl, phenyl substituted by one or more lower alkyls; X is sulphur or an imino group (NH) optionally substituted on the nitrogen atom; and n is an integer from 1 to 13, added to an aqueous solution or antifreeze agent which contains at least one conventional corrosion inhibitor.
Anticorrosive additive for aqueous solutions consisting essentially of an effective amount of a conventional corrosion inhibitor selected from the group consisting of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium dichromate, sodium silicate, an alkali salt of arsensous acid, arsenic acid, phosphorous acid, phosphoric acid, an alkali metal tungstate, an alkali salt of benzoic or toluic acid, an alkali metal salt of a phenol, an alkanolamine and an organosilicon compound and an amount of between 0.03 and 2% by weight of a heterocyclic nitrogen compound having the formula ##STR4## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Anticorrosive additive for aqueous solutions comprising an effective amount of a conventional corrosion inhibitor selected from the group of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium benzoate and sodium silicate and an amount of between 0.0001 and 0.4% by weight of a heterocyclic nitrogen compound having the formula ##STR5## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Corrosion-inhibited aqueous solution consisting essentially of an effective amount of a conventional corrosion inhibitor selected from the group consisting of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium dichromate, sodium silicate, an alkali salt of arsenous acid, arsenic acid, phosphorous acid, phosphoric acid, an alkali metal tungstate, an alkali salt of benzoic or toluic acid, an alkali salt of a phenol, an alkanolamine and an organosilicon compound and an amount of between 0.0005 and 0.2% by weight of a heterocyclic nitrogen compound having the formula:
Anticorrosive concentrate for oil tanks comprising
Corrosion-inhibited aqueous solution comprising an effective amount of a conventional corrosion inhibitor selected from the group of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium benzoate and sodium silicate and an amount of between 0.0005 and 0.2% by weight of a heterocyclic nitrogen compound having the formula ##STR8## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Process for inhibiting the corrosion of materials subject to corrosive attack by aqueous solutions which comprises contacting such materials with a corrosion-inhibited aqueous solution consisting essentially of an effective amount of a conventional corrosion inhibitor selected from the group consisting of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium dichromate, sodium silicate, an alkali salt of arsenous acid, arsenic acid, phosphorous acid, phosphoric acid, an alkali metal tungstate, an alkali metal salt of benzoic or toluic acid, an alkali salt of a phenol, an alkanolamine and organosilicon compound and an amount of between 0.0005 and 0.2% by weight of at least one heterocyclic nitrogen compound having the formula ##STR9## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Process for inhibiting the corrosion of materials subject to corrosive attack by aqueous solutions which comprises contacting such materials with a corrosion-inhibited aqueous solution comprising an effective amount of a conventional corrosion inhibitor selected from the group of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium benzoate and sodium silicate and an amount of between 0.0005 and 0.2% by weight of at least one heterocyclic compound having the formula ##STR10## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Antifreeze additive consisting essentially of a glycol and/or a triol, an effective amount of a conventional corrosion inhibitor selected from the group consisting of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium dichromate, sodium silicate, an alkali metal salt of arsenous acid, arsenic acid, phosphorous acid, phosphoric acid, an alkali metal tungstate, an alkali salt of benzoic or toluic acid, an alkali salt of a phenol, an alkanolamine and an organosilicon compound and an amount of between 0.001 and 0.4% by weight of a heterocyclic nitrogen compound having the formula ##STR11## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Antifreeze additive consisting of
Antifreeze additive consisting of
Antifreeze additive comprising glycols and/or triols, an effective amount of a conventional corrosion inhibitor selected from the group of sodium carbonate, sodium nitrite, sodium nitrate, borax, sodium benzoate and sodium silicate and an amount of between 0.0001 and 0.4% by weight of a heterocyclic nitrogen compound having the formula ##STR12## wherein R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;
Dependencies are inferred from the claim text.