EP0127064A1 - Rust prevention in processing cans - Google Patents

Rust prevention in processing cans Download PDF

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Publication number
EP0127064A1
EP0127064A1 EP84105499A EP84105499A EP0127064A1 EP 0127064 A1 EP0127064 A1 EP 0127064A1 EP 84105499 A EP84105499 A EP 84105499A EP 84105499 A EP84105499 A EP 84105499A EP 0127064 A1 EP0127064 A1 EP 0127064A1
Authority
EP
European Patent Office
Prior art keywords
cans
ppm
amine
morpholine
coated ferrous
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Withdrawn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
EP84105499A
Other languages
German (de)
English (en)
French (fr)
Inventor
Chong Tan Liu
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.)
Henkel Corp
Original Assignee
Amchem Products Inc
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 Amchem Products Inc filed Critical Amchem Products Inc
Publication of EP0127064A1 publication Critical patent/EP0127064A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C23F11/10—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 organic inhibitors
    • C23F11/14—Nitrogen-containing compounds
    • 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
    • C23F11/10—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 organic inhibitors

Definitions

  • Metal containers or, more specifically, metal cans used for packaging food and beverages were formerly manufactured from tinplated steel sheet.
  • tin cans have been largely replaced by the two piece aluminum can especially for use as beverage containers, e.g. beer and soft drink cans.
  • Such containers can be manufactured at lower cost owing to the malleability of aluminum which allows it to be easily worked to produce thin walled aluminum containers from metal sheet material through a process of drawing and ironing.
  • the use of aluminum eliminates the need for tin plating since drawn and ironed corrosion-free aluminum cans can be produced by treating the formed and cleaned cans immediately with a corrosion protective conversion coating such as an ALODINE can coating.
  • Drawn and ironed cans, or DI cans as they are known in the trade are made by stamping or drawing round flat metal stock into a cuplike intermediate form which is then ironed to produce a conventional can body as a single uniformly thin walled container with integral walls and bottom.
  • container manufacturers have sought to produce DI cans from steel, particularly-mild steel known as blackplate and while difficulties in forming such cans from steel have been solved the rapidity with which such steel cans corrode or rust remains a problem.
  • Such treatments to be useful, must not only prevent rust formation during processing and during the useful life of the container, but must also permit the application of a tightly adherent sanitary lacquer as an interior coating as well as printing a decorative exterior.
  • This invention pertains to an improvement in the method of manufacturing steel and coated ferrous metal cans by a process of drawing and ironing whereby steel sheet stock is drawn and thinned to produce a cuplike cylindrical container of substantially uniform wall thickness.
  • the steel sheet stock used in manufacturing containers by this method as received from the foundry is generally coated with a protective oil such as cottonseed oil or dioctyl sebacate.
  • lubricants and other forming aids are applied to the surfaces of the sheet.
  • the side which is to become the inside of the container may be coated with a lubricant such as an acrylic wax and the side opposite may be coated with another composition to facilitate uniform metal deformation, such as molybdenum disulfide in an acrylic base.
  • a lubricant such as an acrylic wax
  • the side opposite may be coated with another composition to facilitate uniform metal deformation, such as molybdenum disulfide in an acrylic base.
  • the residues of all of these materials which remain after the drawing and ironing must be thoroughly removed before the containers can be further processed and finished for packing with food or beverage.
  • the drawn and ironed containers are cleaned with aqueous acidic or alkaline cleaning solutions followed by a rinse and drying. It is in this seguence nf treatments that a maier rust problem occurs with blackplate DI cans owing to the fact that the newly cleaned mild steel surfaces are readily oxidized, particularly in the moist environment.
  • the newly formed containers can be kept free of rust during subsequent processing by applying to the container surfaces an aqueous solution of an amine corrosion inhibitor in concentrations as low as.100 parts per million or less.
  • an amine inhibitor such as morpholine
  • Japanese Patent Application JP 81,133,472 discloses a method of protecting mild steel plate from corrosion by coating it with a wax or resin emulsion containing one or more parts of a fatty acid salt of morpholine.
  • Such treatments could not, however, be used in the processing of blackplate DI cans since the emulsion coating would have to be removed before the cans can be further treated with an internal sanitary lacquer and exterior decorative printing or coating.
  • morpholine or similar amine inhibitors used in accordance with this invention are applied as aqueous solutions in low concentration during or immediately following cleaning and evaporated off during the subsequent drying to leave rust-free clean dry cans which are stable against rusting in further processing; containers treated in this manner are also suitable for application of subsequent protective coatings such as the organic coatings normally applied to provide a suitable foodstuff container.
  • This invention relates to a method for protecting ferrous-based cans against corrosion by contacting the can surfaces with an aqueous solution of an amine inhibitor.
  • the amines that are useful in this invention are water-miscible amines containing a structural unit of the formula wherein n is an integer from 0 to 1 and X is O or N.
  • these water-miscible inhibitory amines are of the formula wherein R, R lr R 2 , R 3 , R 4 , R 5 and R 6 are hydrogen or lower alkyl having from 1 to 4 carbon atoms and may be the same or different, n is an integer from 0 to 1, m is an integer from 1 to 2, X is -0-, -NH-, or -NCH 3 -, and when n is O and m is 1, R 1 and R 2 taken together may be -CH 2 CH 2 -.
  • the lower alkyl groups may be straight chained or branched and include methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, sec- butyl and tert-butyl.
  • R 3 to R 6 are either hydrogen or methyl.
  • the amine will remain in solution until substantially all of the water has been evaporated and that any amine remaining on the metal will be sufficiently volatile to evaporate from the metal under the time and temperature conditions of treatment, and further that no decomposition or condensation products of the amine remain on the metal. It is preferred to use rust inhibiting amines of the above formula having boiling points within the range of about 100 to about 210°C, preferably from about 120 to about 170°C.
  • a particularly suitable amine for this purpose is morpholine (R, R 3 , R 4 , R 5 and R 6 are hydrogen, n is 0, m is 1, X is -O-, and R 1 and R 2 taken together are -CH 2 CH 2 -) which is completely miscible in water in all proportions, has a boiling point of 128.9°C and a vapor pressure of 7.0 mm Hg at 20°C.
  • Mono- and dialkylamines, mono-di-cycloalkyl amines, pyridine, glycols, alkanols, and glycol ethers are unsuitable in the practice of this invention.
  • Mild steel plate (blackplate) is drawn and ironed to form blackplate DI cans which are then subjected to a cleaning operation to remove lubricant residues and other soil.
  • the cleaning is generally carried out by passing the cans through a spray washer utilizing a suitable cleaning composition. Any of the acid, alkaline or neutral cleaners known to the art may be employed and the amine inhibitor treatment of this invention works equally well in all cases to prevent subsequent rust formation.
  • Following the cleaning stage which is normally carried out at elevated temperatures, suitably at a temperature between about 120° to about 212°F preferably water to assure a salt-free surface for subsequent coating.
  • the usual process following the rinse is to dry the cans in an oven at temperatures between about 100°C and about 250°C and preferably between about 150° and about 250°C, more suitably at about 200°C, then coat the interior with a sanitary lacquer and the outer surface with a base coat, or vice versa.
  • the outer coating is then inked to apply the desired decorative or descriptive appearance.
  • the major rust problem occurs in the drying stage where the hot moist environment provides near ideal corrosion conditions for the freshly cleaned mild steel surfaces of the blackplate DI cans. At this sta q e the cans if properly cleaned are free of any corrosion protection and highly susceptible to any corrosive effects.
  • the amine treatment also protects against rust formation when treated cans are allowed to dry at ambient conditions such as occur during line stoppage.
  • the aqueous amine treatment is generally applied as a spray immediately following the deionized water rinse. Normal sequence is clean - tap water rinse - deionized water rinse - amine solution final rinse. Optionally the separate deionized water rinse can be eliminated if salt is continuously removed from the amine final rinse. Methods of application other than spray may also be used so long as the entire metal surface (interior and exterior) of the can is thoroughly exposed to the amine solution.
  • the aqueous amine solution can be applied to the can surface at room temperature (about 20°C) which is the most practicable, though higher or lower temperatures can also be used.
  • the temperature of the spray will not exceed the point at which the amine vaporizes, though vapor treatment is also effective.
  • the amine solution spray will be applied at a temperature between about 15°C and about 35°C.
  • the spray compositions used in this invention consist of only the amine inhibitor and deionized water. It is important that no salts be introduced at this stage since the salt residue will remain on the can surface after evaporation of the water and amine, setting up possible corrosion conditions.
  • the amine is preferably used in a concentration of greater than about 50 ppm. Consistent complete protection against rusting has been obtained by wetting the cans with a deionized water solution containing about 100 ppm of a suitable amine such as morpholine.
  • the least amount of morpholine or other amine inhibitor will be used, generally below about 10% by weight.
  • the amount of amine inhibitor will be between about 20 ppm and about 10,000 ppm and preferably between about 100 and about 5,000 ppm.
  • the amount used is generally between about 50 ppm and about 10,000 ppm, preferably between about 100 ppm and about 2,000 ppm and more preferably between about 500 ppm and about 1,500 ppm.
  • the pH of the amine solution should be about pH 8.0 or hiqher, preferably 8.5 or higher and generally between about 8.7 and about 13.5, with a pH between about 10.8 and about 13.5 being especially preferred.
  • the amine spray solution when used in accordance with this invention is also helpful in preventing rusting which might otherwise occur in the event of a line stoppage.
  • the manner in which the amine inhibitor is applied is less critical so long as it is present on the metal surface.
  • the amine solution can be readily sprinkled onto the cans in an earlier stage whenever line stoppage occurs, thereby avoiding rusting.
  • amine inhibitor at about 100 ppm or more could be included in the normal operation of each stage and thereby safeguard against rust during stoppage.
  • the presence of the amine inhibitor in the clean and rinse stages will not interfere with the operation or effectiveness of these stages.
  • the length of time the aqueous solution of the amine remains in contact with the metal surface does not appear to be critical so long as the entire surface of the can is wetted by the solution. Generally a few seconds spray time, e.g.
  • Blackplate DI cans were cleaned with a commercial cleaning solution using RIDOLINE 666, a can cleaner available from Amchem Products, Inc., Ambler, PA, at 150°C for 21 seconds spray.
  • the cans were rinsed in tap water followed by a deionized water rinse with dwell time of 20 seconds between each stage. Thereafter the cans were allowed a 40-second dwell time and then dried in an air oven using forced air at 200°C for 3 minutes. All cans evidenced significant rusting with rust spots on both the inside and outside domes and around the outside edge.
  • amines were used in concentrations of 1,000 ppm in deionized water. No rust or residue formation occurred during the oven treatment with any of the amines.
  • the amines were morpholine, 3-butoxypropylamine, dimethylamino-2-propanol, dimethylamino-ethanol, diethylamino-ethanol, 2-dimethylamino-2-methyl-l-propanol, 2-amino-2-methyl-I-propanol, monoethanolamine, ethylenediamine, dimethylamino-propylamine, propylene-diamine, and diethylene-triamine.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
EP84105499A 1983-05-16 1984-05-15 Rust prevention in processing cans Withdrawn EP0127064A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US49474683A 1983-05-16 1983-05-16
US494746 1983-05-16
US51714883A 1983-07-25 1983-07-25
US517148 1983-07-25

Publications (1)

Publication Number Publication Date
EP0127064A1 true EP0127064A1 (en) 1984-12-05

Family

ID=27051530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105499A Withdrawn EP0127064A1 (en) 1983-05-16 1984-05-15 Rust prevention in processing cans

Country Status (4)

Country Link
EP (1) EP0127064A1 (enrdf_load_stackoverflow)
AU (1) AU2804584A (enrdf_load_stackoverflow)
BR (1) BR8402262A (enrdf_load_stackoverflow)
GR (1) GR79936B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0215655A1 (en) * 1985-09-17 1987-03-25 Calgon Corporation Method of inhibiting boiler corrosion and compositions for it
EP0216586A1 (en) * 1985-09-17 1987-04-01 Calgon Corporation Stabilized sodium erythorbate and its use as a corrosion inhibitor
US4895703A (en) * 1985-09-17 1990-01-23 Calgon Corporation Trihydroxybenzene boiler corrosion inhibitor compositions and method
EP0357408A1 (en) * 1988-09-01 1990-03-07 Eaton Corporation Metal cleaning process
EP0520108A1 (en) * 1988-03-25 1992-12-30 E.I. Du Pont De Nemours And Company Process of inhibiting corrosion
EP2099952A4 (en) * 2006-12-19 2012-11-21 Nalco Co A FUNCTIONALIZED AMINE-BASED CORROSION INHIBITOR FOR PLATED METAL SURFACES AND APPLICATION METHOD

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521869A1 (de) * 1966-03-01 1970-02-12 Metallgesellschaft Ag Verfahren zur Veraenderung der Korrosionsanfaelligkeit von Stahl
GB1338908A (en) * 1969-12-08 1973-11-28 Kurita Water Ind Ltd Method of preventing corrosion in distillation apparatus substituent
DE2520265A1 (de) * 1975-05-07 1976-11-25 Degussa Mittel zur verhinderung von korrosionen in waessrigen systemen
US4160056A (en) * 1976-09-20 1979-07-03 Nippon Steel Corporation Steel sheet for DrD cans and DI cans
US4192844A (en) * 1977-12-12 1980-03-11 Calgon Corporation Methoxypropylamine and hydrazine steam condensate corrosion inhibitor compositions and methods
DD151185A5 (de) * 1979-05-09 1981-10-08 Conner Alvin James Sen Nicht auf erdoel basierende metallkorrosionsschutzzusammensetzung
GB2084982A (en) * 1980-10-03 1982-04-21 Chemed Corp Composition and method for inhibiting corrosion

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521869A1 (de) * 1966-03-01 1970-02-12 Metallgesellschaft Ag Verfahren zur Veraenderung der Korrosionsanfaelligkeit von Stahl
GB1338908A (en) * 1969-12-08 1973-11-28 Kurita Water Ind Ltd Method of preventing corrosion in distillation apparatus substituent
DE2520265A1 (de) * 1975-05-07 1976-11-25 Degussa Mittel zur verhinderung von korrosionen in waessrigen systemen
US4160056A (en) * 1976-09-20 1979-07-03 Nippon Steel Corporation Steel sheet for DrD cans and DI cans
US4192844A (en) * 1977-12-12 1980-03-11 Calgon Corporation Methoxypropylamine and hydrazine steam condensate corrosion inhibitor compositions and methods
DD151185A5 (de) * 1979-05-09 1981-10-08 Conner Alvin James Sen Nicht auf erdoel basierende metallkorrosionsschutzzusammensetzung
GB2084982A (en) * 1980-10-03 1982-04-21 Chemed Corp Composition and method for inhibiting corrosion

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0215655A1 (en) * 1985-09-17 1987-03-25 Calgon Corporation Method of inhibiting boiler corrosion and compositions for it
EP0216586A1 (en) * 1985-09-17 1987-04-01 Calgon Corporation Stabilized sodium erythorbate and its use as a corrosion inhibitor
US4895703A (en) * 1985-09-17 1990-01-23 Calgon Corporation Trihydroxybenzene boiler corrosion inhibitor compositions and method
EP0520108A1 (en) * 1988-03-25 1992-12-30 E.I. Du Pont De Nemours And Company Process of inhibiting corrosion
EP0357408A1 (en) * 1988-09-01 1990-03-07 Eaton Corporation Metal cleaning process
US4931102A (en) * 1988-09-01 1990-06-05 Eaton Corporation Metal cleaning process
EP2099952A4 (en) * 2006-12-19 2012-11-21 Nalco Co A FUNCTIONALIZED AMINE-BASED CORROSION INHIBITOR FOR PLATED METAL SURFACES AND APPLICATION METHOD

Also Published As

Publication number Publication date
BR8402262A (pt) 1984-12-26
AU2804584A (en) 1984-11-22
GR79936B (enrdf_load_stackoverflow) 1984-10-31

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19850806

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Inventor name: LIU, CHONG TAN