Excor Korrosionsforschung Gmbh

Merck Patent Gesellschaft MIT Beschrankter Haftung

Feinchemie Gmbh Sebnitz

Excor Korrosionsschutz-technolgien Und--produkte Gmbh

Georg Reinhard

Gerhard Hahn

Peter Neitzel

Ralf Glausch

Frank Fassbender

Urte Ludwig

Ursula Rammelt

Renate Jircik

Signe Lautner

Karl-Heinz Kallies

Frank FAßBENDER

Substance combinations are disclosed which include urea, at least one chitosan biopolymer having a degree of deacetylation of from 70% to 95%, and at least one dicarboxylic acid in aqueous solution. The substance combinations are useful as primers for the pretreating substrate surfaces, in particular flat or sheet-form, non-metallic substrates, which are provided as carrier materials for vapor phase corrosion inhibitors, to enable subsequent fixing to those substrate surfaces of vapor phase corrosion inhibitors from an aqueous or aqueous-alcoholic solution containing them. Certain embodiments of the substance combination include 0.1-2% by weight chitosan biopolymer, 10-25% by weight urea, and 0.5-2.5% by weight of a dicarboxylic acid, completely dissolved in deionized water. Yet a further, related aspect of the invention relates to a carrier material for vapor phase corrosion inhibitors, wherein the vapor phase corrosion inhibitors are fixed to a substrate surface pretreated with the substance combination.

Compositions and methods for pretreating substrates for the subsequent fixing of vapor phase corrosion inhibitors

The invention relates to corrosion-inhibiting substance combinations capable of evaporation or sublimation, containing at least: (1) substituted 1,4-benzoquinone, (2) aromatic or alicyclic substituted carbamate, (3) polysubstituted phenol, and (4) monosubstituted pyrimidine. These combinations preferably include 1-30 mass % of component (1), 5-40 mass % of component (2), 2-20 mass % of component (3), and 0.5-10 mass % of component (4), each relating to the total quantity of the substance combination. The components can be provided mixed together or dispersed in water, or also pre-mixed in solubilizer that can be mixed with mineral oils and synthetic oils, preferably an arylalkylether alcohol such as, e.g., phenoxyethanol. Such substance combinations can be used as vapor phase corrosion inhibitors in packaging or during storage in closed spaces for protecting common commodity metals such as iron, chrome, nickel, aluminum, copper and their alloys as well as galvanized steels, against atmospheric corrosion.

Compositions of vapor phase corrosion inhibitors and their use as well as methods for their manufacture

The invention relates to substance combinations comprising (1) at least one substituted, preferably polysubstituted, pyrimidine, (2) at least one monoalkylurea, (3) at least one Cto Caminoalkyldiol, and optionally (4) at least one benzotriazole, preferably a benzotriazole which is substituted on the benzene ring. The components may be mixed together or dispersed in water or pre-mixed in a solubiliser that is miscible in any ratio with mineral oils and synthetic oils, such as for example a phenyl alkyl alcohol or an alkylated phenol. Such substance combinations can be used as vapour phase corrosion inhibitors in packagings or during storage in closed spaces for protecting customary utility metals, such as iron, chromium, nickel, tin, zinc, aluminium, copper and alloys thereof, against atmospheric corrosion.

Compositions of vapour phase corrosion inhibitors, method for the production thereof and use thereof for temporary protection against corrosion

The present invention relates to new substance combinations as vapor phase corrosion inhibitors for protecting a broad range of customary utility metals, including iron, chromium, nickel, tin, zinc, aluminum, copper, magnesium and their alloys, against corrosion in humid climates. Said substance combinations comprise (1) at least one Cto Caliphatic monocarboxylic acid, (2) at least one Cto Caliphatic dicarboxylic acid, and (3) a primary aromatic amide. Preferably they further comprise (4) an aliphatic ester of hydroxybenzoic acid, in particular of 4-hydroxybenzoic acid, and/or (5) a bemzimidazole, in particular a benzimidazole substituted on the benzene ring.

Vapor phase corrosion inhibitors and method for their production

The invention concerns combinations of substances with (1) an aromatic mercaptothiazole or triazole, (2) a multiple substituted phenol insoluble in water, (3) L ascorbic acid or one of its salts and possibly (4) a suitable carboxylic acid/salt pair that after sublimation and condensation on metal surfaces can stabilize the pH value of a condensed water film in the range 4.8&lE;pH&lE;6.5 (referred to 25&deg; C.), and use of the combinations of substances as vapor-phase corrosion inhibitors in packaging or for storage in closed spaces for protecting preferably metals that cannot be passivated, like copper, silver, manganese, magnesium and their alloys, against atmospheric corrosion.

Vapor-phase corrosion inhibitors and methods for their production

The invention relates to a corrosion-inhibiting material comprising a composite containing a metal oxide gel, where necessary modified by an organic polymer, and one or more corrosion inhibitors, and to a method for the production thereof. The corrosion-inhibiting composite material is used for producing corrosion-protective packaging material, for coating metallic and metallized articles as well as for corrosion protection in confined environments.

Corrosion-inhibiting composite material

Anticorrosive pigment preparation containing metal oxide-coated platelet

A pigment preparation for anti-corrosion coating materials, comprising

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Dresden, Germany

Georg Reinhard