EP0657564B1 - Procédé de nettoyage et conditionnement de la surface d'un métal ou alliage électrolytiquement oxydable par hyperanodisation de cette surface - Google Patents

Procédé de nettoyage et conditionnement de la surface d'un métal ou alliage électrolytiquement oxydable par hyperanodisation de cette surface Download PDF

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Publication number
EP0657564B1
EP0657564B1 EP94203574A EP94203574A EP0657564B1 EP 0657564 B1 EP0657564 B1 EP 0657564B1 EP 94203574 A EP94203574 A EP 94203574A EP 94203574 A EP94203574 A EP 94203574A EP 0657564 B1 EP0657564 B1 EP 0657564B1
Authority
EP
European Patent Office
Prior art keywords
alloy
electrolyte
conditioning
cleaning
oxidizable metal
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.)
Expired - Lifetime
Application number
EP94203574A
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German (de)
English (en)
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EP0657564A1 (fr
Inventor
Dario Felisari
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Individual
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling

Definitions

  • the washing process commonly used by aluminum alloy manufacturers or fabricators essentially consists in a band degreasing step carried out in order to remove greases or similar organic substances used in the rolling process.
  • Such a removal is carried out by bringing the band to be washed into contact with a liquid phase displaying strong affinity for the impurities, substantially performing the task of transferring the latter from the solid into the liquid phase.
  • Said processes are usually carried out with solvent liquids (e.g., trichloroethylene) or alkaline solutions which are suitably buffered, therefore with reduced reactivity towards aluminum; in order to cause the impurities to diffuse, the processes known from the prior art rely on diffusion (high-temperature processes), or on kinds of fluxing (castings), or on the supply of mechanical energy to the interface (brushing, sonication).
  • solvent liquids e.g., trichloroethylene
  • alkaline solutions which are suitably buffered, therefore with reduced reactivity towards aluminum
  • the processes known from the prior art rely on diffusion (high-temperature processes), or on kinds of fluxing (castings), or on the supply of mechanical energy to the interface (brushing, sonication).
  • a rinsing step follows, often followed, in its turn, by steps of anchoring functional groups for surface protection, or acting as adhesion promoters (oxidation, chromate treatment, phosphating treatment or phospho-chromate treatment).
  • Electrochemical processes are known as well in the practice of metal articles degreasing, which consist in submitting the metal surface to an anodic or cathodic action, while said surface is immersed in suitable electrolytic solutions.
  • SU 12 44 216 describes the electrochemical treatment in washing solution used as electrolyte, in which the electrolyte is hexametaphosphate (salt of a weak acid), which means that an alkaline pH is involved.
  • the process according to the present patent application consists in an action of ionic type which exclusively occurs at high current density values (superficial electrical intensity comprised within the range of from some tens, up to one hundred A/dm 2 ), in the presence of a polybasic acidic electrolyte, when the electrolytically oxidizable material is submitted 5 to anodizing with a higher voltage than the stopping potential of formed oxide.
  • the present invention consists of a process for cleaning and conditioning the surface of an electrolitically oxidisable metal alloy, in which said alloy is immersed in a solution of an electrolyte and said surface of said alloy is submitted to anodising, characterised by the fact that said alloy is a light alloy, said electrolyte is a polybasic acidic electrolyte and that an oxide layer is formed on said surface, the anodising voltage being higher than the breakdown potential of said oxide layer.
  • the voltage gradient concentrated in the immediate nearby of the surface of 15 the metal to be treated, promotes a violent, localized energy development with the results disclosed hereinabove being accomplished.
  • a process results which is governed by easily modulated electrical parameters in which, following a supply of electrical energy (of the order of 1 kW/dm 2 of exposed surface) a nearly immediate decontamination of band surface is attained.
  • the essential parameters are constituted by the electrical conductivity of the bath 25 and the local current density on the surface to be treated.
  • the present electrodes necessary for the above events to take place prevailingly perform transport functions, and therefore their composition slowly 30 varies during the process.
  • the energy excess turned into heat must be transferred to a secondary fluid, and can be recovered for the rinsing or drying process.
  • the band to be treated is electrically connected to the positive terminal of power supply unit.
  • the ionic action takes place inside a tank inside which the band can run while being immersed, exposed to the surfaces of opposite polarity electrodes (cathodes).
  • the process consists in submitting the surface layer of an electrolytically oxidizable light alloy to the action of an electrical field with a higher field intensity than the breakdown intensity during an anodizing step.
  • the process is particularly useful for high-speed treatment of bands of light alloy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (5)

  1. Procédé de nettoyage et de conditionnement de la surface d'un alliage métallique oxydable électrolytiquement, dans lequel cet alliage est immergé dans une solution d'un électrolyte et la surface de l'alliage est soumise à une anodisation, caractérisé par le fait que l'alliage est un alliage léger, en ce que l'électrolyte est un électrolyte acide polybasique, et en ce qu'une couche d'oxyde est formée sur la surface, la tension d'anodisation étant supérieure au potentiel de rupture de la couche d'oxyde.
  2. Procédé selon la revendication 1, caractérisé en ce que l'électrolyte est de l'acide phosphorique.
  3. Procédé selon la revendication 1, caractérisé en ce que des concentrations allant de 1 à 6 % en poids d'électrolyte sont utilisées.
  4. Procédé selon la revendication 1, caractérisé en ce que le procédé est mis en oeuvre à une température située dans la plage comprise entre 50 et 100°C.
  5. Procédé selon la revendication 1, caractérisé par le fait que l'alliage est une bande d'alliage léger.
EP94203574A 1993-12-09 1994-12-07 Procédé de nettoyage et conditionnement de la surface d'un métal ou alliage électrolytiquement oxydable par hyperanodisation de cette surface Expired - Lifetime EP0657564B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93MI002585A IT1265263B1 (it) 1993-12-09 1993-12-09 Procedimento di lavaggio e condizionamento superficiale ottenuto attraverso un processo di iper-anodizzazione di leghe ossidabili
ITMI932585 1993-12-09

Publications (2)

Publication Number Publication Date
EP0657564A1 EP0657564A1 (fr) 1995-06-14
EP0657564B1 true EP0657564B1 (fr) 1999-04-21

Family

ID=11367311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94203574A Expired - Lifetime EP0657564B1 (fr) 1993-12-09 1994-12-07 Procédé de nettoyage et conditionnement de la surface d'un métal ou alliage électrolytiquement oxydable par hyperanodisation de cette surface

Country Status (5)

Country Link
EP (1) EP0657564B1 (fr)
AT (1) ATE179228T1 (fr)
DE (1) DE69418004T2 (fr)
ES (1) ES2131632T3 (fr)
IT (1) IT1265263B1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5958604A (en) * 1996-03-20 1999-09-28 Metal Technology, Inc. Electrolytic process for cleaning and coating electrically conducting surfaces and product thereof
US5981084A (en) * 1996-03-20 1999-11-09 Metal Technology, Inc. Electrolytic process for cleaning electrically conducting surfaces and product thereof
RU2077611C1 (ru) * 1996-03-20 1997-04-20 Виталий Макарович Рябков Способ обработки поверхностей и устройство для его осуществления
EP0958412B1 (fr) * 1996-06-17 2003-12-10 Alcan International Limited Traitement de pieces en aluminium
CN102787346B (zh) * 2012-07-31 2015-12-02 沙福国 清洁环保型镀膜前的等离子体清洗工艺

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB517415A (en) * 1938-04-22 1940-01-30 Samuel Joseph Blaut Improvements in electrochemical treatment of metal
DE1021229B (de) * 1953-05-19 1957-12-19 Magnesium Elektron Ltd Anwendung der anodischen Behandlung von Legierungen auf Magnesiumgrundlage zur Entfernung von Formsandverunreinigungen auf Gussstuecken aus solchen Legierungen
AT252685B (de) * 1964-12-22 1967-03-10 Ruthner Ind Planungs Ag Verfahren zum Beizen hochlegierter Stähle und Sonderlegierungen
FR1489213A (fr) * 1966-06-10 1967-07-21 Pechiney Prod Chimiques Sa Décapage électrolytique des alliages de cuivre et de béryllium
FR1544974A (fr) * 1966-11-18 1968-11-08 Revere Copper & Brass Inc Procédé de traitement de surfaces de cuivre en feuilles
US3756931A (en) * 1971-09-13 1973-09-04 Boer C De Electrolytic cleaning and corrosi on removal process
JPS5188435A (ja) * 1975-02-03 1976-08-03 Denkaisenjoho
NL8100687A (nl) * 1981-02-12 1982-09-01 Fokker Bv Beitsen van aluminium.
US4363709A (en) * 1981-02-27 1982-12-14 Allegheny Ludlum Steel Corporation High current density, acid-free electrolytic descaling process
JPS6049720B2 (ja) * 1981-09-28 1985-11-05 工業技術院長 Ｓｕｓ３０４ステンレス鋼のスケ−ル除去方法
SU1244216A1 (ru) * 1983-01-11 1986-07-15 Всесоюзный Ордена Трудового Красного Знамени Научно-Исследовательский Институт Сельскохозяйственного Машиностроения Им.В.П.Горячкина Способ очистки металлических деталей
JPS60140199A (ja) * 1983-12-28 1985-07-25 日立プラント建設株式会社 放射性金属廃棄物の電解除染方法
US4640752A (en) * 1985-10-28 1987-02-03 Engelhard Corporation Method for producing silver colored brazing alloy
JPH0711078B2 (ja) * 1989-01-09 1995-02-08 スカイアルミニウム株式会社 プリント回路基板用基材の製造方法
RU1798393C (ru) * 1990-01-09 1993-02-28 Всесоюзный научно-исследовательский институт метизной промышленности Способ электрохимической очистки стальных длинномерных изделий
DE4310749A1 (en) * 1993-04-01 1993-09-09 Siemens Ag Electrochemical decontamination of metal component using strongly alkaline electrolyte liq. - used to remove radioactive oxide layers from PWR and BWR components

Also Published As

Publication number Publication date
IT1265263B1 (it) 1996-10-31
ES2131632T3 (es) 1999-08-01
ITMI932585A0 (it) 1993-12-09
ITMI932585A1 (it) 1995-06-09
DE69418004T2 (de) 1999-10-21
EP0657564A1 (fr) 1995-06-14
DE69418004D1 (de) 1999-05-27
ATE179228T1 (de) 1999-05-15

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