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Class 422/13 - Aqueous alkali environment (i.e., pH greater than or equal to 8.4)


Subclass of Class 422 - Chemical apparatus and process disinfecting, deodorizing, preserving, or sterilizing
Definition: Process for preventing damage to metal caused by an environment
No. of patents: 179
Last issue date: 11/15/2011


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NumberTitleIssue Date
4241016Hydroxybenzoic acid as pH buffer and corrosion inhibitor for antifreeze containing organosiloxane-silicate copolymers
This invention relates to single-phase antifreeze or coolant concentrates comprising an alcohol, a corrosion inhibiting amount of a water-soluble organosiloxane-silicate copolymer corrosion inhibitor and an organic basic pH buffer capable of buffering pH ...
12/23/1980
4241015Hydroxybenzoic acid as pH buffer and corrosion inhibitor for antifreeze containing organosilicone-silicate polymers
A single-phase antifreeze or coolant concentrate is disclosed comprising an alcohol, a silicone-silicate copolymer and an organic basic pH buffer and corrosion inhibitor comprising a hydroxybenzoic acid or mixtures thereof. The concentrates are preferably...
12/23/1980
4237090Method for inhibiting corrosion in aqueous systems
This invention is a method for inhibiting corrosion in aqueous systems containing components composed of aluminum, copper, iron, or alloys thereof. The method comprises (a) incorporating in the aqueous medium 2-10 ppm by weight of tolyltriazole; an effect...
12/02/1980
4229409Method of inhibiting corrosion of aluminum with 2-phosphono-butane-1,2,4-tricarboxylic acid
A method of inhibiting the corrosion of aluminum in contact with an alkaline solution comprising adding 2-phosphono-butane-1,2,4-tricarboxylic acid or a water-soluble salt thereof as inhibitor to the alkaline solution....
10/21/1980
4217242Process for preparing an improved anti-oxidant gum composition for lithographic plates
Provided is a process for preparing an improved gum formulation useful for preventing oxidation in exposed and developed lithographic printing plates. The gum so produced exhibits reduced foaming and air entrapment properties....
08/12/1980
4216087Scrubber scale prevention
The present invention concerns a method of inhibiting or controlling calcium scale deposition in SO2 flue gas scrubbers which comprises scrubbing said flue gases with an aqueous composition comprising concentrated sodium hydroxide and a 2-hydro...
08/05/1980
4212842Corrosion inhibition
This invention relates to a process of inhibiting corrosion which comprises adding an aqueous soluble form of a normally insoluble corrosion inhibitor to an aqueous system which converts the soluble corrosion inhibitor to an insoluble form which coats the...
07/15/1980
4209487Method for corrosion inhibition
1,2-Ethane diphosphonates of the general formula wherein M is hydrogen, metal ion, ammonium, alkyl ammonium or mixtures thereof, are disclosed as inhibiting the corrosion of metals by oxygen-bearing waters. The 1,2-ethane diphosphonates can be employed ei...
06/24/1980
4172032Polyphosphate-based industrial cooling water treatment
When a specific condensed phosphate glass is combined with an organic phosphate ester, an improved composition is afforded for preventing scale and corrosion in industrial cooling systems. Optionally, certain azoles are combined with the phosphate glass a...
10/23/1979
4168292Acylated hydroxyalkylaminoalkylamides and preparation thereof and uses thereof as corrosion inhibitors
Acylated hydroxyalkylaminoalkylamides, the N-alkylated derivatives thereof, and the preparation thereof and uses thereof as corrosion inhibitors....
09/18/1979
4116629Corrosion inhibition of stainless steel exposed to hot carbonates
A method for inhibiting the corrosion of martensitic and ferritic stainless steel surfaces which are exposed to hot carbonate solutions which comprises contacting said stainless steel surfaces with nickel ions and preferably with at least 10 ppm of nickel...
09/26/1978
4105581Corrosion inhibitor
Corrosion inhibitor comprised of a phosphate and phosphonate, which further includes a homopolymer of maleic acid or maleic anhydride. The inhibitor is capable of effectively functioning in aqueous systems operating at an alkaline pH, and in particular a ...
08/08/1978
4073618Anti-corrosive agent for metals
A method of inhibiting corrosion of metals comprising applying to a metal surface in an effective concentration a saturated aliphatic triamine of 9 carbon atoms having at each terminal position a primary amino group and being branched in the 4-position of...
02/14/1978
4045253Passivating metal surfaces
A method for passivating acid-cleaned ferrous metal surfaces is disclosed. The method features the use of an aqueous passivating solution having a pH of greater than about 8, comprising a base, an oxygen containing gas, and one of hydrazine, an iron compl...
08/30/1977
4028055Anti-corrosive agent for metals
A method of inhibiting corrosion of metals comprising applying to a metal surface in an effective concentration a saturated aliphatic triamine of 9 carbon atoms having at each terminal position a primary amino group and being branched in the 4-position of...
06/07/1977
3989459Method of preventing corrosion of steelworks
A method of preventing corrosion of steelworks by a flowing corrosive solution having a pH of 6.7 to 7.1 and comprising water, ammonia in a concentration of from 0.5 to 4 mols per liter of solution and hydrogen sulfide in a concentration of from 5 to 15 k...
11/02/1976
3989460Water soluble waterflood corrosion inhibitor
Hydrochloric acid derivatives of cyclic nitrogen compounds in combination with polyalkoxylated fatty acids are water soluble, waterflood corrosion inhibitors, which because of their solubility avoid the potential clogging problems encountered with waterfl...
11/02/1976
3985504Anticorrosive agent
Anticorrosive agent based on saponified ene-adducts of maleic anhydride to unsaturated fatty acids or derivatives thereof....
10/12/1976
3951844Corrosion inhibition of aqueous potassium carbonate gas treating systems
Corrosion inhibition of ferrous metals by aqueous potassium carbonate solutions in acid gas treating systems is effected by a combination of antimony compounds with vanadium anions in the plus 5 valence state....
04/20/1976
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