EP1639151A1 - Composition permettant de former des revetements de conversion sur des surfaces en aluminium - Google Patents

Composition permettant de former des revetements de conversion sur des surfaces en aluminium

Info

Publication number
EP1639151A1
EP1639151A1 EP04743071A EP04743071A EP1639151A1 EP 1639151 A1 EP1639151 A1 EP 1639151A1 EP 04743071 A EP04743071 A EP 04743071A EP 04743071 A EP04743071 A EP 04743071A EP 1639151 A1 EP1639151 A1 EP 1639151A1
Authority
EP
European Patent Office
Prior art keywords
coating
coating material
per litre
material according
aluminium
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Withdrawn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
EP04743071A
Other languages
German (de)
English (en)
Inventor
Alison Jane Hartopp
Richard Franklyn Foster
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.)
Natech Ltd
Original Assignee
Natech Ltd
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 Natech Ltd filed Critical Natech Ltd
Publication of EP1639151A1 publication Critical patent/EP1639151A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/36—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
    • C23C22/361—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing titanium, zirconium or hafnium 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/10—Orthophosphates containing oxidants

Definitions

  • This invention concerns a coating material, a coating material concentrate, and a method of coating, and particularly but not exclusively a material or method for coating surfaces of aluminium or aluminium alloys.
  • aqueous coating solutions that are effective in forming thereon coatings which are corrosion resistant and thereby protect the surface from degradation due to attack by corrosive materials.
  • the coatings formed from such coating solutions should also have properties such that overlying coatings which are applied thereto adhere tightly and strongly.
  • overlying coatings are decorative or functional in nature and are formed from materials such as paints, lacquers, inks, etc.
  • an aluminium coating operation is the coating of aluminium cans.
  • the corrosion resistant and adherent coatings which are applied to aluminium cans should be uniformly clear and colourless so that the coated cans have the bright shiny natural appearance of the underlying aluminium. This bright shiny natural appearance is desired in the final product even though portions of the can may be covered with coloured paints or inks.
  • coated aluminium cans should have is the ability to resist discoloration when the coated can is subjected to moderately hot water, for example, water having a temperature within the range of about 60 to 80°C.
  • moderately hot water for example, water having a temperature within the range of about 60 to 80°C.
  • aluminium cans are treated in this way to achieve "pasteurisation" of the cans. This treatment has a tendency to cause an uncoated or even a coated aluminium surface to blacken or otherwise discolour thereby leaving the can with an unattractive appearance.
  • the most widely used coating solutions for aluminium cans contain a source of zirconium, free fluoride ions and a source of vegetable tannin. While such a coating solution is capable of forming coatings of the type desired, their use creates waste disposal and workplace hazard problems because of the presence therein of the highly corrosive and toxic fluoride ions. Additional considerations of importance for the treatment bath which is applied to the aluminium and which provides the coating are: (1 ) the energy utilised by the method of application of the conversion coating, including the temperature at which the coating is applied; (2) the quality -of the resulting coating; and (3) the control necessary to achieve the desired coating. A high quality coating with short application times and relatively low process temperatures is most desired.
  • a coating material comprising a coating solution usable on aluminium surfaces, the solution being acidic with a pH of between 2 and 4.5, and including:
  • the solution is preferably aqueous.
  • the coating material is preferably such as to not require the presence of free fluoride ions for its effectiveness.
  • the material is preferably substantially free of vegetable tannins.
  • the material preferably provides a substantially transparent coating when applied.
  • the zirconium ions may be obtained from fluorozirconic acid, but may be obtained from alkali metal or ammonium fluorozirconates, or zirconium fluoride, nitrates or carbonates.
  • the solution preferably includes nitric acid, the nitric acid concentration being preferably between 0.05g per litre and 0.2g per litre.
  • the solution may include a complex fluoride.
  • the complex fluoride may be fluorosilicic acid, fiuoroboric acid, or a similar acid.
  • the complex fluoride concentration is- preferably between 0.05 and 0.2g per litre.
  • the polysaccharide may be polyglucoside.
  • the polyglucoside is preferably derived from any of starch, pectins, alginates and gums from plants, trees and seaweed by hydrolysis using acid or enzymes, either synthetic or those produced by yeasts and bacteria.
  • the polysaccharide is preferably alkylated, ethoxylated or propoxylated.
  • the invention also provides a concentrate for making a coating solution usable on aluminium surfaces, the concentrate including:
  • the invention further provides a method of coating an aluminium or aluminium alloy surface, the method comprising using a material according to any of the preceding eleven paragraphs.
  • the coating may be formed from a concentrate as previously defined, and nitric acid may be added to the concentrate.
  • the solution may be sprayed onto the surface.
  • the coating may take place at a temperature of between 20 and 40°C, and desirably between 25 and 35°C.
  • the coating may take place for between 10 and 60 seconds.
  • compositions were prepared from concentrates, with the first two being according to the invention and the others included for reference. These were applied by spraying onto previously cleaned, drawn and ironed aluminium cans. Following spraying the cans were rinsed with tap water and then cold deionised water and dried for 2 minutes at 180°C. The spraying was carried out at 38°C for 40 seconds with a spray pressure of 1 bar.
  • Table 1 The contents of the compositions are given in Table 1 below where the rows are for the composition and the columns are respectively: -
  • the cans were placed in a muffle furnace at around 525°C for 5 minutes. The discolouration of the aluminium surface was observed. A golden coloured can being desirable. A light muffle indicates inadequate treatment, a dark muffle indicates over treatment.
  • the tape adhesion test was performed to measure the adhesion between a cleaned surface and an organic finish or overcoating.
  • White ink from BASF was applied, using a rubber brayer.
  • Water-borne, wet-ink varnish from PPG Company was roll-coated with a #1 0 draw-down bar to achieve a coating thickness of 3gm "2 .
  • the coated surface was cured in a forced-air oven for 90 seconds at about 177°C.
  • the finished (i.e. painted) surface after being cured, was immersed in boiling tap water or a 1% detergent (such as "JOY", a commercially available PROCTOR & GAMBLE product) solution for 15 minutes, rinsed in tap water, and dried.
  • the treated surface was then cross- hatched, and SCOTCH brand transparent tape (#61 0) (commercially available from 3M) was applied to the cross-hatched area. The amount of paint removed by the tape was observed, and the results were rated as follows:
  • the invention therefore provides coatings with good properties which for instance avoid discolouration if pasteurisation is carried out.
  • the materials according to the invention are free of fluoride ions which prevent corrosion and toxic hazards generally encountered when fluoride ions are present. Furthermore, waste disposal problems are substantially avoided.
  • coatings according to the present invention can be provided at relatively low temperatures and with short process times. With coatings according to the invention it is possible to utilise high levels of phosphate to give good coatings which are very resistant to corrosion especially to darkening for example during pasteurisation. This is enabled by the polysaccharide, which prevents high levels of phosphate from causing a hydrophobic effect on the conversion coating layer and hence inhibiting the process.
  • the treating bath that produces the coating is not as sensitive to "cleaning solution drag", the proclivity of a cleaning solution to undesirably alter the pH of the treating bath for the conversion coating.
  • “drag-in” from an acidic cleaning solution used to clean cans of lubricant and fines in a can production line will lower the pH of a subsequent treating bath for a conversion coating, below the commercially operable limits of the bath.
  • a further advantage provided is the inhibition of dissolution of aluminium from the can during conversion coating. This ensures that the total amount of aluminium released into the solution is much less than with previous arrangements. This in turn means that there does not have to be an excess of free fluoride in the solution to sequester aluminium which would otherwise' react with the source of zirconium and inhibit the conversion coating process.
  • the polysaccharide inhibits dissolution of aluminium from the can surface during conversion coating.
  • the small amounts of aluminium that are released are sequestered by the carboxylic acid or its derivative, which avoids precipitation of aluminium from the bath.
  • This also means that very bright and shiny cans are produced by the invention as there is no fluoride to etch the can.
  • the polysaccharide improves the conversion coating, giving improved crystal structure and a more even coating. This allows optimum adhesion for subsequent applied coatings.
  • coating materials according to the invention could be used with solvent-based systems in addition to aqueous systems.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un matériau de revêtement utilisable sur des surfaces en aluminium, ce matériau se présentant sous la forme d'une solution acide dont le pH est compris entre 2 et 4,5. Le matériau selon l'invention peut comporter : 0,05 g par litre d'ions zirconium ; 0,1 g par litre d'un polysaccharide, par exemple d'un polyglucoside ; 0,05 g par litre d'acide carboxylique, et ; 0,11 g par litre de phosphate.
EP04743071A 2003-06-26 2004-06-24 Composition permettant de former des revetements de conversion sur des surfaces en aluminium Withdrawn EP1639151A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0314901A GB0314901D0 (en) 2003-06-26 2003-06-26 Coating material
PCT/GB2004/002720 WO2005001158A1 (fr) 2003-06-26 2004-06-24 Composition permettant de former des revetements de conversion sur des surfaces en aluminium

Publications (1)

Publication Number Publication Date
EP1639151A1 true EP1639151A1 (fr) 2006-03-29

Family

ID=27637387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04743071A Withdrawn EP1639151A1 (fr) 2003-06-26 2004-06-24 Composition permettant de former des revetements de conversion sur des surfaces en aluminium

Country Status (6)

Country Link
EP (1) EP1639151A1 (fr)
JP (1) JP2007527465A (fr)
AU (1) AU2004252269A1 (fr)
BR (1) BRPI0411926A (fr)
GB (1) GB0314901D0 (fr)
WO (1) WO2005001158A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9428410B2 (en) 2007-09-28 2016-08-30 Ppg Industries Ohio, Inc. Methods for treating a ferrous metal substrate
US8097093B2 (en) 2007-09-28 2012-01-17 Ppg Industries Ohio, Inc Methods for treating a ferrous metal substrate
US20100012892A1 (en) 2008-07-15 2010-01-21 Basf Catalysts Llc Tooth Whitening Compositions and Methods
MX2015006443A (es) * 2012-11-26 2015-10-29 Chemetall Gmbh Metodo para recubrir superficies metalicas de sustratos, y objetos recubiertos de acuerdo con el metodo.
UA113689C2 (xx) 2013-03-06 2017-02-27 Спосіб видалення заліза з ванни попередньої обробки металевої підкладки
US9273399B2 (en) 2013-03-15 2016-03-01 Ppg Industries Ohio, Inc. Pretreatment compositions and methods for coating a battery electrode
EP3142800A1 (fr) * 2014-05-14 2017-03-22 Chemetall GmbH Procédé de revêtement de surfaces métalliques de substrats et objets revêtus selon ce procédé
US10435806B2 (en) 2015-10-12 2019-10-08 Prc-Desoto International, Inc. Methods for electrolytically depositing pretreatment compositions

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4992116A (en) * 1989-04-21 1991-02-12 Henkel Corporation Method and composition for coating aluminum
US5139586A (en) * 1991-02-11 1992-08-18 Coral International, Inc. Coating composition and method for the treatment of formed metal surfaces
GB2259920A (en) * 1991-09-10 1993-03-31 Gibson Chem Ltd Surface conversion coating solution based on molybdenum and phosphate compounds
US5534082A (en) * 1992-04-01 1996-07-09 Henkel Corporation Composition and process for treating metal
DE4412138A1 (de) * 1994-04-08 1995-10-12 Henkel Kgaa Chromfreies Verfahren zur No-Rinse Behandlung von Aluminium und seinen Legierungen sowie hierfür geeignete wäßrige Badlösungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005001158A1 *

Also Published As

Publication number Publication date
BRPI0411926A (pt) 2006-08-15
GB0314901D0 (en) 2003-07-30
JP2007527465A (ja) 2007-09-27
AU2004252269A1 (en) 2005-01-06
WO2005001158A1 (fr) 2005-01-06

Similar Documents

Publication Publication Date Title
CA1137393A (fr) Passivation de surface metallique, sans chrome ou avec tres peu de chrome
US4338140A (en) Coating composition and method
AU2016363456B2 (en) Chromium-free surface-treated tinplate, production method and surface treating agent therefor
US4313769A (en) Coating solution for metal surfaces
ES2391988T3 (es) Material de acero chapado que contiene cinc revestido con material compuesto que tiene excelentes características de resistencia a la corrosión, resistencia al ennegrecimiento, adherencia del revestimiento y resistencia a los álcalis
GB1570041A (en) Acidic aqueous chemical conversion solutions and processes for forming adherent corrosion-resistant coatings therewith upon aluminium surface
CA1341156C (fr) Alliage d'aluminium comprenant un revetement protecteur sans chrome
CA2025218A1 (fr) Melange servant au recouvrement de l'aluminium par un enduit ne contenant aucun chromate et methode connexe
JPS5811515B2 (ja) 金属表面にリン酸亜鉛皮膜を形成するための組成物
CA1264538A (fr) Composition et methode pour le traitement de substrats ferreux
NO873904L (no) Sjiktdannende passivering ved multimetallfremgangsmaate.
CA2124977C (fr) Procede de passivation sans chrome et composition pour les surfaces en metal galvanise
EP1639151A1 (fr) Composition permettant de former des revetements de conversion sur des surfaces en aluminium
JPH01283386A (ja) 金属表面処理組成物および保護皮膜形成方法
KR101035859B1 (ko) 인산염 금속 표면을 위한 크롬없는 최종 린스
US4277292A (en) Ternary corrosion resistant coatings
US20070264511A1 (en) Method and composition for forming a coloured coating on a metallic surface
US3338755A (en) Production of phosphate coatings on metals
CA1174945A (fr) Enduit pour surfaces en metal
EP0016298A1 (fr) Solution pour conférer une resistance au ternissage à des surfaces d'aluminium et procédé d'application
NO128168B (fr)
US20040115448A1 (en) Corrosion resistant magnesium and magnesium alloy and method of producing same
US7144599B2 (en) Hybrid metal oxide/organometallic conversion coating for ferrous metals
JPS5934234B2 (ja) アルミニウム表面処理組成物およびアルミニウム表面処理方法
US3046165A (en) Method of and solution for forming phosphate coatings on zinc surfaces

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20060119

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20080101