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CORROSION PATENTS

CORROSION PATENTS Corrosion inhibitors dyes may also be present. The salts may for water-wetted surfaces be dissolved directly in the paint or in a diluting agent, or mechanically dispersed The compositions described are applied in a finely divided state.—Brit. Pat. to water-wetted surfaces. They are able 640,729, A/B. Hassle Apotekare Paul Nord- to penetrate the water films and become stroms Fabriker. adsorbed as oriented, polar, monomol. films. They contain C _ aliphatic mono- 4 8 hydric alcohols with a straight chain of at Phosphating treatment least 3 C per mol., a polar-type corrosion A mixture suitable for storage and inhibitor and an antioxidant. Butyl alcohol, transport, e.g. i n paper bags, cardboard amyl alcohol, 3-methyl-1-butanol, 2- drums, etc., consists of sodium sulphate methyl-1-butanol, 3-pentanol and 2-ethyl- and phosphoric acid, in which minimum 1-butanol are the alcohols used. Glyceryl content of the former is about 40%. oleate and dioleate, Na petroleum sul- Various methods of preparing the mixture phonate and cyclohexylamine laurate are are described. It may be improved by the the corrosion inhibitors. As antioxidants, addition of oxidising agents, such as sodium 2, 6-di-tert-butyl-4-methylphenol, 2, 4- nitrate, etc., as is usual in phosphating dimethyl-6-tert-butylphenol, and butyl- processes. The mixture is used i n aqueous aminophenol are used combined with solution of 2 to 10% concentration at a small amounts of butylphenylenediamine temperature of 90°C. Resistance to cor­ and di-sec-butyl-p-phenylenediamine. The rosion and adhesion of lacquer are both compositions are useful for removal of said to be excellent.—Brit. Pat. 699,308, fingerprint acids from surfaces as well as Henkel & Cie. G.m.b.H. for salvage of apparatus exposed to sea water.—U.S. Pat. 2,647,839, W. A. Zisman Protection of molybdenum and H. R. Baker. A slip in alcohol of finely divided glass (Al O 16 to 17%) and SiO is applied 2 3 2 Vapour-phase inhibitor to the article (previously electroplated with in organic coatings Co) and dried. The coated article is then Strippable and non-strippable, mainly heated i n an atmosphere of H at > 1,300° transparent, organic coatings (alkyd resin, to fuse the glass on to the article and effect ethylcellulose, waxes, lacquers, etc.) are the evolution of SiH , which then reacts made inhibitive against corrosion of ferrous with the surface of the Mo.—Brit. Pat. and non-ferrous metals by incorporation 702,960, Westinghouse Electric International of 2 to 20 wt.% of a N-base nitrite salt Co. vapour - phase corrosion inhibitor, e.g. dicycloalkylamine nitrite. — U.S. Pat. Coating cables 2,596,450, Shell Development Co., A. A continuous method is described for Wachter and N. Stillman. the protection of metal-sheathed cable and having an overall waterproofing and cor­ Protective coating rosion-resistant layer. The heated cable is Steel is phosphated and coated with a passed through a vessel containing—or is primer coating 1 mil thick of a cured syn­ otherwise contacted with—thermoplastic thetic resin containing at least 25% of material in a cold, finely divided form at phosphate or chromate inhibitor. A further controlled speed and/or temperature to 1-mil coating of a cured flexible oil- ensure adhesion. The cable is cooled, e.g. modified alkyd and phenolic resin contain­ by air blast.—Brit. Pat. 700,177, The Tele­ ing 15 to 40% mica (100 mesh) is applied graph Construction and Maintenance Co. and then a finishing coat of flexible cured Ltd. and J. N. Dean. synthetic resin containing at least 50% finely divided filler to screen the second Rust inhibiting container coating from ultra-violet radiation.—U.S. Pat. 2,636,257, Westinghouse Electric Corp. At least 2% by weight of a benzoate of an alkaline earth metal (Ca, Sr, Ba) Anticorrosive coatings or of Pb or Zn, by weight, is added to the coating composition, without a highly Amine, e.g. diethanolamine, methyl- water-soluble salt of an organic acid. The amine, diethylamine, triethanolamine or anti-corrosion properties of these benzoates morpholine, salts or ammonium salts of is attributed to their small but quite nitrophenol, nitrocresol or nitronaphthol appreciable solubility in water. They have are added in a minor amount, e.g. 0.2 to been included hitherto among numerous 2%, as anticorrosive ingredients in paints other salts of inorganic acids for use as or varnishes comprising binders, e.g. wetting and dispersing agents in paints, nitrocellulose, coumarone, urea-formalde­ etc. The pigments used may be TiO hyde, phenol-aldehyde or alkyd resins, in natural ochre, Paris white, etc., in a suitable an organic solvent, e.g. benzene, alcohols vehicle, with lead and cobalt naph- and their esters, chlorinated hydrocarbons, thenate driers.—Brit. Pat. 704,861, Good- acetone, cyclohexane or silicanes. Drying lass, Wall & Lead Industries Ltd. agents, plasticisers, pigments and organic CORROSION TECHNOLOGY, August 1954 203 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

CORROSION PATENTS

Anti-Corrosion Methods and Materials , Volume 1 (6): 1 – Jun 1, 1954

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0003-5599
DOI
10.1108/eb018955
Publisher site
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Abstract

Corrosion inhibitors dyes may also be present. The salts may for water-wetted surfaces be dissolved directly in the paint or in a diluting agent, or mechanically dispersed The compositions described are applied in a finely divided state.—Brit. Pat. to water-wetted surfaces. They are able 640,729, A/B. Hassle Apotekare Paul Nord- to penetrate the water films and become stroms Fabriker. adsorbed as oriented, polar, monomol. films. They contain C _ aliphatic mono- 4 8 hydric alcohols with a straight chain of at Phosphating treatment least 3 C per mol., a polar-type corrosion A mixture suitable for storage and inhibitor and an antioxidant. Butyl alcohol, transport, e.g. i n paper bags, cardboard amyl alcohol, 3-methyl-1-butanol, 2- drums, etc., consists of sodium sulphate methyl-1-butanol, 3-pentanol and 2-ethyl- and phosphoric acid, in which minimum 1-butanol are the alcohols used. Glyceryl content of the former is about 40%. oleate and dioleate, Na petroleum sul- Various methods of preparing the mixture phonate and cyclohexylamine laurate are are described. It may be improved by the the corrosion inhibitors. As antioxidants, addition of oxidising agents, such as sodium 2, 6-di-tert-butyl-4-methylphenol, 2, 4- nitrate, etc., as is usual in phosphating dimethyl-6-tert-butylphenol, and butyl- processes. The mixture is used i n aqueous aminophenol are used combined with solution of 2 to 10% concentration at a small amounts of butylphenylenediamine temperature of 90°C. Resistance to cor­ and di-sec-butyl-p-phenylenediamine. The rosion and adhesion of lacquer are both compositions are useful for removal of said to be excellent.—Brit. Pat. 699,308, fingerprint acids from surfaces as well as Henkel & Cie. G.m.b.H. for salvage of apparatus exposed to sea water.—U.S. Pat. 2,647,839, W. A. Zisman Protection of molybdenum and H. R. Baker. A slip in alcohol of finely divided glass (Al O 16 to 17%) and SiO is applied 2 3 2 Vapour-phase inhibitor to the article (previously electroplated with in organic coatings Co) and dried. The coated article is then Strippable and non-strippable, mainly heated i n an atmosphere of H at > 1,300° transparent, organic coatings (alkyd resin, to fuse the glass on to the article and effect ethylcellulose, waxes, lacquers, etc.) are the evolution of SiH , which then reacts made inhibitive against corrosion of ferrous with the surface of the Mo.—Brit. Pat. and non-ferrous metals by incorporation 702,960, Westinghouse Electric International of 2 to 20 wt.% of a N-base nitrite salt Co. vapour - phase corrosion inhibitor, e.g. dicycloalkylamine nitrite. — U.S. Pat. Coating cables 2,596,450, Shell Development Co., A. A continuous method is described for Wachter and N. Stillman. the protection of metal-sheathed cable and having an overall waterproofing and cor­ Protective coating rosion-resistant layer. The heated cable is Steel is phosphated and coated with a passed through a vessel containing—or is primer coating 1 mil thick of a cured syn­ otherwise contacted with—thermoplastic thetic resin containing at least 25% of material in a cold, finely divided form at phosphate or chromate inhibitor. A further controlled speed and/or temperature to 1-mil coating of a cured flexible oil- ensure adhesion. The cable is cooled, e.g. modified alkyd and phenolic resin contain­ by air blast.—Brit. Pat. 700,177, The Tele­ ing 15 to 40% mica (100 mesh) is applied graph Construction and Maintenance Co. and then a finishing coat of flexible cured Ltd. and J. N. Dean. synthetic resin containing at least 50% finely divided filler to screen the second Rust inhibiting container coating from ultra-violet radiation.—U.S. Pat. 2,636,257, Westinghouse Electric Corp. At least 2% by weight of a benzoate of an alkaline earth metal (Ca, Sr, Ba) Anticorrosive coatings or of Pb or Zn, by weight, is added to the coating composition, without a highly Amine, e.g. diethanolamine, methyl- water-soluble salt of an organic acid. The amine, diethylamine, triethanolamine or anti-corrosion properties of these benzoates morpholine, salts or ammonium salts of is attributed to their small but quite nitrophenol, nitrocresol or nitronaphthol appreciable solubility in water. They have are added in a minor amount, e.g. 0.2 to been included hitherto among numerous 2%, as anticorrosive ingredients in paints other salts of inorganic acids for use as or varnishes comprising binders, e.g. wetting and dispersing agents in paints, nitrocellulose, coumarone, urea-formalde­ etc. The pigments used may be TiO hyde, phenol-aldehyde or alkyd resins, in natural ochre, Paris white, etc., in a suitable an organic solvent, e.g. benzene, alcohols vehicle, with lead and cobalt naph- and their esters, chlorinated hydrocarbons, thenate driers.—Brit. Pat. 704,861, Good- acetone, cyclohexane or silicanes. Drying lass, Wall & Lead Industries Ltd. agents, plasticisers, pigments and organic CORROSION TECHNOLOGY, August 1954 203

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Jun 1, 1954

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