EP2682502B1 - Treatment process comprising the anodizing of copper-containing aluminium alloys - Google Patents
Treatment process comprising the anodizing of copper-containing aluminium alloys Download PDFInfo
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- EP2682502B1 EP2682502B1 EP13174807.1A EP13174807A EP2682502B1 EP 2682502 B1 EP2682502 B1 EP 2682502B1 EP 13174807 A EP13174807 A EP 13174807A EP 2682502 B1 EP2682502 B1 EP 2682502B1
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- bath
- rinsing
- copper
- anodizing
- anode
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- 238000000034 method Methods 0.000 title claims description 28
- 239000010949 copper Substances 0.000 title claims description 26
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 22
- 229910052802 copper Inorganic materials 0.000 title claims description 22
- 238000007743 anodising Methods 0.000 title claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 20
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 17
- 230000007797 corrosion Effects 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 15
- 239000003792 electrolyte Substances 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000007800 oxidant agent Substances 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 description 16
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 238000002048 anodisation reaction Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000004090 dissolution Methods 0.000 description 5
- 239000010936 titanium Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910000978 Pb alloy Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 238000005282 brightening Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241001080024 Telles Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006263 metalation reaction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
Description
La présente invention concerne un procédé de traitement d'une pièce en alliage d'aluminium contenant du cuivre en proportion massique de 0,1% à 10%.The present invention relates to a process for treating an aluminum alloy part containing copper in a mass proportion of 0.1% to 10%.
Les alliages d'aluminium contenant du cuivre se corrodent essentiellement sous forme de corrosion localisée, sous forme de piqûres ou points de corrosion. Ce phénomène intervient à l'aplomb des particules riches en cuivre qui sont présentes dans ces alliages.Copper-containing aluminum alloys corrode primarily in the form of localized corrosion, in the form of pits or spots of corrosion. This phenomenon comes in line with the copper-rich particles that are present in these alloys.
Pour renforcer la résistance à la corrosion d'alliages d'aluminium en général, on effectue une anodisation (ou une conversion chimique) de ces alliages qui augmente l'épaisseur de la couche d'oxydes (oxyde d'aluminium en cas d'anodisation) à leur surface.To enhance the corrosion resistance of aluminum alloys in general, anodizing (or chemical conversion) of these alloys is carried out which increases the thickness of the oxide layer (aluminum oxide in case of anodizing ) on their surface.
Avant de recevoir ce traitement d'anodisation (ou de conversion chimique), ces alliages nécessitent d'être prétraités. Ce prétraitement a pour objectifs :
- D'enlever les salissures de surface et les oxydes résiduels sans dissoudre le métal sous-jacent (procédé de dégraissage/décapage),
- D'aplanir la surface du métal en dissolvant une partie de celui-ci (procédé de brillantage).
- To remove surface soils and residual oxides without dissolving the underlying metal (degreasing / stripping process),
- Flatten the surface of the metal by dissolving a part of it (brightening process).
Ce prétraitement s'effectue habituellement dans un électrolyte aqueux par voie chimique ou par voie électrochimique. Cet électrolyte contient un ou plusieurs acides tels que l'acide sulfurique (H2SO4) et l'acide phosphorique (H3PO4). L'ajout d'un ou plusieurs oxydants tels que l'acide nitrique, le persulfate d'hydrogène, le perborate d'hydrogène, et l'eau oxygénée (peroxyde d'hydrogène H2O2) dans cet électrolyte favorise la dissolution du métal et l'émulsification des salissures ou graisses de surface, et permet un rinçage acceptable de la pièce en alliage d'aluminium. Dans le cas des procédés de brillantage, l'ajout d'un composé organique conduit à la formation en surface de l'alliage d'aluminium d'une couche visqueuse qui contribue à la dissolution des irrégularités de surface.This pretreatment is usually carried out in an aqueous electrolyte chemically or electrochemically. This electrolyte contains one or more acids such as sulfuric acid (H 2 SO 4 ) and phosphoric acid (H 3 PO 4 ). The addition of one or more oxidants such as nitric acid, hydrogen persulfate, hydrogen perborate, and hydrogen peroxide (hydrogen peroxide H 2 O 2 ) in this electrolyte promotes the dissolution of the metal and emulsification of dirt or grease from the surface, and allows an acceptable rinsing of the aluminum alloy part. In the case of brightening processes, the addition of an organic compound leads to the formation on the surface of the aluminum alloy of a viscous layer which contributes to the dissolution of the surface irregularities.
Lors du prétraitement d'alliages d'aluminium contenant du cuivre, on observe d'une part que les particules riches en cuivre ne se dissolvent que partiellement, ce qui provoque la présence de nombreux défauts (trous, fissures, cavités) dans les couches d'oxydes formées ultérieurement par anodisation (ou conversion chimique) à la surface de l'alliage, ces défauts fragilisant ces couches et entrainant une corrosion prématurée de l'alliage.In the pretreatment of copper-containing aluminum alloys, it is observed that the copper-rich particles dissolve only partially, which causes the presence of numerous defects (holes, cracks, cavities) in the layers of copper. oxides subsequently formed by anodizing (or chemical conversion) on the surface of the alloy, these defects weakening these layers and resulting in premature corrosion of the alloy.
On observe d'autre part que le cuivre présent dans les bains se redépose très rapidement sous forme de cuivre métallique sur la surface de l'alliage, ce qui entraine également une corrosion prématurée de l'alliage.It is observed on the other hand that the copper present in the baths redeposits very quickly in the form of metallic copper on the surface of the alloy, which also causes premature corrosion of the alloy.
Un exemple de procédé de traitement contre la corrosion d'une pièce en alliage d'aluminium contenant du cuivre est donné par le document
La présente invention vise à remédier à ces inconvénients.The present invention aims to remedy these disadvantages.
L'invention vise à proposer un procédé de traitement d'un alliage d'aluminium contenant du cuivre avec prétraitement et anodisation qui permette une dissolution complète des particules de cuivre, et qui permette d'éviter une redéposition ultérieure de cuivre sur la surface de l'alliage d'aluminium, ce procédé étant en outre apte à minimiser les variations dimensionnelles de la pièce.The aim of the invention is to propose a process for treating a copper-containing aluminum alloy with pretreatment and anodization which allows a complete dissolution of the copper particles, and which makes it possible to avoid a subsequent redeposition of copper on the surface of the copper. aluminum alloy, this method being further able to minimize the dimensional variations of the workpiece.
Ce but est atteint grâce au fait que le procédé comprend les étapes suivantes :
- (a) On fournit ladite pièce,
- (b) On effectue un prétraitement électrochimique de la pièce dans un premier bain d'électrolyte contenant de l'acide sulfurique et un premier composé oxydant, une première différence de potentiel ΔV1 étant établie entre une première cathode et une première anode trempées dans le premier bain, la pièce étant la première anode, la concentration en ce premier composé oxydant étant telle que le potentiel de corrosion de cet alliage d'aluminium est supérieur à +100 mV par rapport à l'Electrode Normale à Hydrogène,
- (c) Après l'étape (b), on effectue une anodisation de la pièce dans un second bain d'électrolyte contenant de l'acide sulfurique et un second composé oxydant, une seconde différence de potentiel ΔV2 étant établie entre une seconde cathode et une seconde anode trempées dans le second bain, la pièce étant la seconde anode.
- (a) The piece is provided,
- (b) Electrochemical pretreatment of the workpiece in a first electrolyte bath containing sulfuric acid and a first oxidizing compound, a first potential difference ΔV1 being established between a first cathode and a first anode dipped in the first bath, the part being the first anode, the concentration in this first oxidizing compound being such that the corrosion potential of this aluminum alloy is greater than +100 mV with respect to the Normal Hydrogen Electrode,
- (c) After step (b), the part is anodized in a second electrolyte bath containing sulfuric acid and a second oxidizing compound, a second potential difference ΔV2 being established between a second cathode and a second anode dipped in the second bath, the piece being the second anode.
Grâce à ces dispositions, on effectue un nettoyage de la surface de la pièce, on retire les particules riches en cuivre de la surface et on empêche la redéposition ultérieure des particules de cuivre, ce qui permet d'obtenir un dépôt d'oxyde par anodisation de meilleure qualité. La pièce est ainsi plus résistante à la corrosion.Thanks to these arrangements, the surface of the workpiece is cleaned, the copper-rich particles are removed from the surface and the subsequent redeposition of the copper particles is prevented, thereby obtaining oxide deposition by anodizing. better quality. The part is thus more resistant to corrosion.
De plus, le nettoyage de la surface de la pièce entame suffisamment peu celle-ci de telle sorte que les variations de dimensions de la pièce restent dans les tolérances admises.In addition, the cleaning of the surface of the part starts sufficiently little thereof so that variations in dimensions of the part remain within the tolerances allowed.
Avantageusement, la première différence de potentiel ΔV1 est comprise entre 3 V et 12 V.Advantageously, the first potential difference ΔV1 is between 3 V and 12 V.
Ainsi, le prétraitement de la pièce est plus rapide tout en aboutissant à une meilleure qualité du prétraitement puis de l'anodisation ultérieure de la pièce.Thus, the pretreatment of the part is faster while resulting in a better quality of the pretreatment and subsequent anodization of the piece.
L'invention sera bien comprise et ses avantages apparaîtront mieux, à la lecture de la description détaillée qui suit, d'un mode de réalisation représenté à titre d'exemple non limitatif. La description se réfère aux dessins annexés sur lesquels :
- la
figure 1 illustre schématiquement les étapes du procédé selon l'invention, - la
figure 2 illustre schématiquement les étapes du procédé selon un autre mode de réalisation de l'invention.
- the
figure 1 schematically illustrates the steps of the process according to the invention, - the
figure 2 schematically illustrates the steps of the method according to another embodiment of the invention.
On fournit une pièce 50 en alliage d'aluminium contenant du cuivre (étape (a) du procédé selon l'invention). La proportion massique de cuivre dans cet alliage est comprise entre 0.01 % et 10 %.An
On fournit un premier bain électrolytique 10 contenant de l'acide sulfurique et un premier composé oxydant.A first
Ce premier bain 10 est contenu dans une première cuve 15. On trempe dans ce premier bain 10 une première cathode 11 et la pièce 50, cette pièce 50 jouant le rôle de première anode.This
La première cathode 11 est par exemple un alliage de titane ou un alliage de plomb ou un acier inoxydable.The
On effectue un traitement électrochimique de la pièce 50 dans le premier bain 10 en appliquant une première différence de potentiel ΔV1 entre la première cathode 11 et la pièce 50. Ce traitement constitue le prétraitement électrochimique (étape (b)) du procédé selon l'invention.The
On choisit la concentration en premier composé oxydant de telle sorte que durant ce prétraitement électrochimique le potentiel de corrosion de l'alliage d'aluminium de la pièce 50 est supérieur à +100 mV par rapport à l'Electrode Normale à Hydrogène.The concentration of the first oxidizing compound is chosen so that during this electrochemical pretreatment the corrosion potential of the aluminum alloy of the
En effet, les essais réalisés par les inventeurs montrent que dans ce cas il se produit une dissolution complète des particules riches en cuivre tandis que la quantité d'alliage dissous est suffisamment faible pour que les spécifications dimensionnelles de la pièce 50 restent satisfaites. Ainsi, la quantité d'alliage dissous est inférieure à 0,1 mg/dm2/min (milligrammes/décimètres2/minute).Indeed, the tests carried out by the inventors show that in this case there is a complete dissolution of the copper-rich particles while the amount of dissolved alloy is sufficiently low for the dimensional specifications of the
De plus, durant le prétraitement électrochimique selon l'invention, il ne se produit pas de redéposition de cuivre sur la pièce 50.Moreover, during the electrochemical pretreatment according to the invention, no copper redeposition on the
Au contraire, en effectuant un prétraitement chimique (sans électrolyse) selon l'art antérieur, la quantité d'alliage dissoute est comprise entre 0,4 mg/dm2/min et 4 mg/dm2/min.On the contrary, by performing a chemical pretreatment (without electrolysis) according to the prior art, the amount of dissolved alloy is between 0.4 mg / dm 2 / min and 4 mg / dm 2 / min.
Les concentrations en acide sulfurique et en premier composé oxydant nécessaires pour que le potentiel de corrosion de l'alliage d'aluminium de la pièce 50 soit supérieur à +100 mV dépendent de l'alliage d'aluminium et de la nature du premier composé oxydant.The concentrations of sulfuric acid and the first oxidizing compound necessary for the corrosion potential of the aluminum alloy of the
Les essais effectués par les inventeurs montrent que pour une concentration en acide sulfurique comprise entre 70 g/L et 250 g/L, la concentration en premier composé oxydant doit être supérieure à 0,1 mol/L.The tests carried out by the inventors show that for a sulfuric acid concentration of between 70 g / l and 250 g / l, the concentration of the first oxidizing compound must be greater than 0.1 mol / l.
Par exemple, si le premier composé oxydant est NaBO3, sa concentration doit être comprise entre 0,1 mol/L et 0,5 mol/L.For example, if the first oxidizing compound is NaBO 3 , its concentration should be between 0.1 mol / L and 0.5 mol / L.
Par exemple, si le premier composé oxydant est K2S2O8, sa concentration doit être comprise entre 0,1 mol/L et 0,5 mol/L.For example, if the first oxidizing compound is K 2 S 2 O 8 , its concentration should be between 0.1 mol / L and 0.5 mol / L.
Par exemple, si le premier composé oxydant est l'eau oxygénée H2O2, sa concentration doit être comprise entre 0,1 mol/L et 1 mol/L.For example, if the first oxidizing compound is oxygenated water H 2 O 2 , its concentration must be between 0.1 mol / l and 1 mol / l.
Avantageusement, le premier composé oxydant est de l'eau oxygénée.Advantageously, the first oxidizing compound is hydrogen peroxide.
En effet, les essais effectués par les inventeurs montrent que l'eau oxygénée permet d'atteindre un potentiel de corrosion de l'alliage d'aluminium de la pièce 50 par rapport à l'Electrode Normale à Hydrogène qui est supérieur au potentiel de corrosion obtenu avec un autre composé oxydant.Indeed, the tests carried out by the inventors show that the oxygenated water makes it possible to reach a corrosion potential of the aluminum alloy of the
Avantageusement, la première différence de potentiel ΔV1 est comprise entre 3 V et 12 V.Advantageously, the first potential difference ΔV1 is between 3 V and 12 V.
En effet, lorsque la première différence de potentiel ΔV1 est inférieure à 3 V, la dissolution de l'alliage aluminium de la pièce 50 est trop lente pour les cadences de production de pièces recherchées.Indeed, when the first potential difference ΔV1 is less than 3 V, the dissolution of the aluminum alloy of the
Lorsque cette première différence de potentiel ΔV1 est supérieure à 12 V, il se forme à la surface de la pièce 50 une couche anodisée trop rapidement pour permettre aux particules de cuivre de se dissoudre et de s'éloigner de la surface de la pièce 50.When this first potential difference ΔV1 is greater than 12 V, an anodized layer is formed on the surface of the
Avantageusement, la première différence de potentiel ΔV1 est comprise entre 5 V et 10 V.Advantageously, the first potential difference ΔV1 is between 5 V and 10 V.
Selon l'invention, la durée du prétraitement est comprise entre 2 et 30 minutes.According to the invention, the pretreatment time is between 2 and 30 minutes.
Après le traitement électrochimique de la pièce 50 tel que décrit ci-dessus, on effectue une anodisation de la pièce 50 dans un second bain d'électrolyte 20 contenant de l'acide sulfurique et un second composé oxydant. Ce second bain 20 est contenu dans une seconde cuve 25. On trempe dans ce second bain 20 une seconde cathode 21 et la pièce 50, cette pièce 50 jouant le rôle de seconde anode.After the electrochemical treatment of the
La seconde cathode 21 est par exemple un alliage de plomb ou un alliage de titane ou un acier inoxydable.The
On effectue un traitement électrochimique de la pièce 50 dans le second bain 20 en appliquant une seconde différence de potentiel ΔV2 entre la première cathode 11 et la pièce 50. Ce traitement constitue l'anodisation (étape (c)) du procédé selon l'invention.The
Le second composé oxydant est par exemple choisi dans un groupe constitué de NaBO3, K2S2O8, et l'eau oxygénée H2O2.The second oxidizing compound is for example selected from a group consisting of NaBO 3 , K 2 S 2 O 8 , and hydrogen peroxide H 2 O 2 .
A l'issue du procédé selon l'invention, on obtient sur la pièce 50 une couche d'oxyde d'aluminium par anodisation dont la résistance à la corrosion est supérieure à celle obtenue par un procédé selon l'art antérieur. Ainsi, les essais effectués par les inventeurs sur des alliages d'aluminium 2214 et 7050 (après colmatage de la couche d'oxyde, et après 500 heures d'exposition au brouillard salin neutre) montrent que le nombre de piqures par dm2 est inférieur à 1 lorsqu'on utilise le procédé selon l'invention alors que le nombre de piqures par dm2 est supérieur à 5 (pour l'alliage 2214) ou 10 (pour l'alliage 7050) lorsqu'on utilise un procédé selon l'art antérieur avec prétraitement chimique.At the end of the process according to the invention, there is obtained on the
La composition chimique nominale de l'alliage 2214 est (norme EN 573-1):
- Si : 0,5 - 1,2 ; Fe : 0,3 ; Cu : 3,9 - 5 ; Mn : 0,4 - 1,2 ; Mg : 0,2 - 0,8 ;
- Cr : 0,1 ; Zn : 0,25 ; Ti : 0,15 ; impuretés : 0,15 ; le reste étant Al.
- If: 0.5 - 1.2; Fe: 0.3; Cu: 3.9 - 5; Mn: 0.4 - 1.2; Mg: 0.2 - 0.8;
- Cr: 0.1; Zn: 0.25; Ti: 0.15; impurities: 0.15; the rest being Al.
La composition chimique nominale de l'alliage 7050 est (norme EN 573-1):
- Si : 0,12 ; Fe : 0,15 ; Cu : 2 - 2,6 ; Mn : 0,1 ; Mg : 1,9 - 2,6 ; Cr : 0,04 ;
- Zn : 5,7 - 6,7 ; Zr : 0,08 - 0,15 ; Ti : 0,6 ; impuretés : 0,15 ; le reste étant Al.
- If: 0.12; Fe: 0.15; Cu: 2 - 2.6; Mn: 0.1; Mg: 1.9 - 2.6; Cr: 0.04;
- Zn: 5.7 - 6.7; Zr: 0.08-0.15; Ti: 0.6; impurities: 0.15; the rest being Al.
Les essais effectués par les inventeurs montrent que la couche d'anodisation qui se forme à la surface de la pièce 50 durant l'anodisation offre une protection encore meilleure (l'impédance de la couche d'anodisation est plus élevée) lorsque le prétraitement électrochimique (étape (b)) préalable est effectué avec une première différence de potentiel ΔV1 de 10 V pendant 5 minutes ou de 5 V pendant 10 minutes.The tests carried out by the inventors show that the anodizing layer that forms on the surface of the
Les essais effectués par les inventeurs montrent que la couche d'anodisation qui se forme à la surface de la pièce 50 durant l'anodisation offre une meilleure protection (son impédance est plus élevée) lorsque la concentration en eau oxygénée est comprise entre 5 g/L et 25 g/L pour un alliage d'aluminium 7050.The tests carried out by the inventors show that the anodizing layer which forms on the surface of the
Les essais effectués par les inventeurs montrent que la couche d'anodisation qui se forme à la surface de la pièce 50 durant l'anodisation offre une meilleure protection (son impédance est plus élevée) lorsque la concentration en eau oxygénée est supérieure à 2 g/L pour un alliage d'aluminium 2214.The tests carried out by the inventors show that the anodizing layer which forms on the surface of the
L'anodisation est effectuée avec une concentration en acide sulfurique comprise entre 100 g/L et 300 g/L selon l'épaisseur de la couche d'anodisation recherchée.The anodization is carried out with a sulfuric acid concentration of between 100 g / l and 300 g / l depending on the thickness of the desired anodization layer.
Avantageusement, cette concentration est comprise entre 160 g/L et 240 g/L, ce qui entraine une meilleure efficacité du procédé.Advantageously, this concentration is between 160 g / l and 240 g / l, which leads to a better efficiency of the process.
Encore plus avantageusement, cette concentration est environ égale à 200 g/L.Even more advantageously, this concentration is approximately equal to 200 g / l.
Avantageusement, le second composé oxydant est de l'eau oxygénée.Advantageously, the second oxidizing compound is hydrogen peroxide.
Avantageusement, l'anodisation est effectuée avec une concentration en eau oxygénée comprise entre 15 g/L et 20 g/L.Advantageously, the anodization is carried out with a hydrogen peroxide concentration of between 15 g / l and 20 g / l.
Avantageusement, l'anodisation est effectuée avec un palier dans le voltage, c'est-à-dire qu'on applique un premier voltage compris entre 12 et 17 V, puis éventuellement un second voltage compris entre 17 et 22 V afin de ne pas endommager les installations électriques.Advantageously, the anodization is carried out with a bearing in the voltage, that is to say that a first voltage is applied between 12 and 17 V, then possibly a second voltage between 17 and 22 V so as not to damage electrical installations.
Selon un premier mode de réalisation de l'invention, on effectue un rinçage de la pièce 50 entre l'étape (b) (prétraitement) et l'étape (c) (anodisation).According to a first embodiment of the invention, the
L'anodisation a donc lieu dans un premier bain 10 qui est distinct du second bain 20, la première cuve 15 étant distincte de la seconde cuve 25.The anodization therefore takes place in a
Après le prétraitement, on sort la pièce 50 du premier bain 10, et on la rince. Ce rinçage présente l'avantage de débarrasser la pièce 50 de résidus éventuellement présents sur sa surface à l'issue du prétraitement. En outre, le second bain 20 étant distinct du premier bain 10, on évite une pollution du second bain par des éléments dissous durant le prétraitement et qui sont présents dans le premier bain 10.After pretreatment, the
Une fois la pièce 50 rincée, on trempe la pièce 50 dans le second bain 20 afin qu'elle y subisse le traitement d'anodisation.Once the
Avantageusement, le rinçage de la pièce 50 est constitué des étapes suivantes :
- (b1) On rince la pièce 50
dans un bain 91 de rinçage statique. - (b2) Puis on rince la pièce 50
dans un bain 92 de rinçage courant avec de l'eau permutée.
- (b1) The
part 50 is rinsed in astatic rinsing bath 91. - (b2) Then the
part 50 is rinsed in a current rinsebath 92 with deionized water.
Le rinçage de la pièce 50 est ainsi plus efficace.The rinsing of the
Selon un autre mode de réalisation de l'invention, l'étape (c) d'anodisation s'effectue dans le même bain que le premier bain 10 de l'étape (b) de prétraitement, sans ressortir la pièce 50 du premier bain 10 entre l'étape (b) et l'étape (c).According to another embodiment of the invention, the anodizing step (c) is carried out in the same bath as the
La deuxième cuve 25 est donc la première cuve 15, et le second bain 20 est constitué du premier bain 10 à l'issue du prétraitement.The
Ainsi, le procédé selon l'invention est simplifié, et le temps total de traitement de la pièce selon ce procédé est diminué.Thus, the method according to the invention is simplified, and the total time of treatment of the part according to this method is decreased.
Claims (6)
- A method of treating a part (50) made of aluminum alloy containing copper at a content lying in the range 0.1% to 10% by weight, the method being characterized by comprising the following steps:(a) providing said part(50),(b) performing electrochemical pretreatment of said part (50) in a first electrolyte bath (10) containing sulfuric acid and a first oxidizer compound, a first potential difference ΔV1 being established between a first cathode (11) and a first anode dipped in said first bath (10), said part (50) being said first anode, the concentration of said first oxidizer compound being such that the corrosion potential of said aluminum alloy is greater than +100 mV relative to a Hydrogen Normal Electrode;c. after step (b), anodizing said part (50) in a second electrolyte bath (20) containing sulfuric acid and a second oxidizer compound, a second potential difference ΔV2 being established between a second cathode (21) and a second anode dipped in said second bath, said part (50) being said second anode.
- A method according to claim 1, characterized in that, in step (b), said first potential difference ΔV1 lies in the range 3 V to 12 V.
- A method according to claim 1 or 2, characterized in that said first oxidizer compound is hydrogen peroxide H2O2.
- A method according to any one of claims 1 to 3, characterized in that anodizing step (c) is performed in the same bath as the first bath of the pretreatment step (b), without extracting said part (50) from said first bath (10) between step (b) and step (c).
- A method according to any one of claims 1 to 3, wherein between step (b) and step (c), a step is performed of rinsing said part (50).
- A method according to claim 5, characterized in that said rinsing is constituted by the following steps:(b1) rinsing said part (50) in a static rinsing bath (91),(b2) then rinsing said part (50) in a running rinsing bath (92) with softened water.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1256393A FR2992979B1 (en) | 2012-07-04 | 2012-07-04 | PROCESSING PROCESS WITH ANODIZATION OF ALUMINUM ALLOYS CONTAINING COPPER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2682502A1 EP2682502A1 (en) | 2014-01-08 |
| EP2682502B1 true EP2682502B1 (en) | 2015-09-16 |
Family
ID=46852236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13174807.1A Active EP2682502B1 (en) | 2012-07-04 | 2013-07-02 | Treatment process comprising the anodizing of copper-containing aluminium alloys |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20140008236A1 (en) |
| EP (1) | EP2682502B1 (en) |
| FR (1) | FR2992979B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111663163A (en) * | 2019-03-08 | 2020-09-15 | 核工业理化工程研究院 | Anticorrosion treatment method of 2A50 aluminum alloy and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4263113A (en) * | 1980-06-02 | 1981-04-21 | Sprague Electric Company | Electrochemical removal of surface copper from aluminum foil |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB398825A (en) * | 1932-01-16 | 1933-09-18 | Philip Ray Coursey | Improvements in the electrolytic production of insulating layers on metals |
| FR897693A (en) * | 1942-12-15 | 1945-03-28 | Improvements to anodic oxidation processes for metal surfaces | |
| GB1215314A (en) * | 1967-11-22 | 1970-12-09 | Acorn Anodising Company Ltd | Improvements in or relating to the anodising of aluminium and its alloys |
| US3666638A (en) * | 1970-04-21 | 1972-05-30 | Sidney Levine | Process for anodizing aluminum materials |
| CA1106795A (en) * | 1975-06-27 | 1981-08-11 | Toshihiko Sato | Coloured pattern on anodized aluminium article with shade differences |
| US4336113A (en) * | 1981-06-26 | 1982-06-22 | American Hoechst Corporation | Electrolytic graining of aluminum with hydrogen peroxide and nitric or hydrochloric acid |
| US5362569A (en) * | 1993-03-22 | 1994-11-08 | Bauman Albert J | Anodizing and duplex protection of aluminum copper alloys |
| US5635084A (en) * | 1994-05-20 | 1997-06-03 | University Of Southern California | Method for creating a corrosion-resistant surface on an aluminum-copper alloy |
| US5814682A (en) * | 1996-06-14 | 1998-09-29 | Rusin; Richard P. | Method of luting a provisional prosthetic device using a glass ionomer cement system and kit therefor |
| CN1152632A (en) * | 1996-10-17 | 1997-06-25 | 周国桢 | One stage method pretreating liquid for aluminium material oxidation pretreatment |
| ITTO20010149A1 (en) * | 2001-02-20 | 2002-08-20 | Finmeccanica S P A Alenia Aero | LOW ECOLOGICAL ANODIZATION PROCEDURE OF A PIECE OF ALUMINUM OR ALUMINUM ALLOYS. |
| US6475368B2 (en) * | 2001-03-07 | 2002-11-05 | Kemet Electronics Corporation | Method of aqueous anodizing aluminum substrates of solid capacitors |
| US20040050709A1 (en) * | 2002-09-17 | 2004-03-18 | The Boeing Company | Accelerated sulfuric acid and boric sulfuric acid anodize process |
| US7022202B2 (en) * | 2004-01-08 | 2006-04-04 | Mareiners, Llc | Method for applying images to surfaces |
| JP2008112877A (en) * | 2006-10-31 | 2008-05-15 | Nichicon Corp | Manufacturing method of electrode foil for electrolytic capacitor |
| IT1398287B1 (en) * | 2009-09-18 | 2013-02-22 | Unical A G S P A | METHOD OF ANODIZING METAL ALLOYS, PARTICULARLY FOR HEAT EXCHANGERS IN ALUMINUM ALLOYS AND SIMILAR FOR CONDENSING BOILERS. |
-
2012
- 2012-07-04 FR FR1256393A patent/FR2992979B1/en active Active
-
2013
- 2013-07-02 US US13/933,988 patent/US20140008236A1/en not_active Abandoned
- 2013-07-02 EP EP13174807.1A patent/EP2682502B1/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4263113A (en) * | 1980-06-02 | 1981-04-21 | Sprague Electric Company | Electrochemical removal of surface copper from aluminum foil |
Non-Patent Citations (2)
| Title |
|---|
| K. SRINIVASA RAO: "EFFECT OF PRE-TREATMENT ON CORROSION RESISTANCE OF CHROMATE CONVERSION COATED AND ANODIZED AA2219 ALLOY", TRANS. INDIAN INST, MET, VOL. 57, N°. 2, 1 April 2004 (2004-04-01), pages 133 - 140, XP055172823, Retrieved from the Internet <URL:http://www.igcar.gov.in/transiim/2004/TP-1881.pdf> [retrieved on 20150302] * |
| L DOMINGUES ET AL: "Anodising of Al 2024-T3 in a modified sulphuric acid/boric acid bath for aeronautical applications", CORROSION SCIENCE, vol. 45, no. 1, 1 January 2003 (2003-01-01), pages 149 - 160, XP055170389, ISSN: 0010-938X, DOI: 10.1016/S0010-938X(02)00082-3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2992979A1 (en) | 2014-01-10 |
| EP2682502A1 (en) | 2014-01-08 |
| FR2992979B1 (en) | 2014-08-08 |
| US20140008236A1 (en) | 2014-01-09 |
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