EP1484421B1 - Use of a rolled or extruded aluminium alloy product having a good corrosion resistance - Google Patents

Use of a rolled or extruded aluminium alloy product having a good corrosion resistance Download PDF

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Publication number
EP1484421B1
EP1484421B1 EP04356088A EP04356088A EP1484421B1 EP 1484421 B1 EP1484421 B1 EP 1484421B1 EP 04356088 A EP04356088 A EP 04356088A EP 04356088 A EP04356088 A EP 04356088A EP 1484421 B1 EP1484421 B1 EP 1484421B1
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Prior art keywords
alloy
rolled
corrosion resistance
content
aluminium alloy
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German (de)
French (fr)
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EP1484421A1 (en
Inventor
Sylvain Henry
Gilbert Gutmann
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Constellium Issoire SAS
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Alcan Rhenalu SAS
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Definitions

  • the invention relates to the field of use of rolled or spun aluminum alloy products of the 4000 series having both good mechanical strength and good resistance to corrosion, including filiform corrosion.
  • Aluminum alloys containing silicon as the main alloying element are widely used for the manufacture of molded parts. On the other hand, they are rarely used in the form of rolled or spun products. Uses in the form of rods or profiles are related to the good resistance to wear and temperature of high silicon alloys, and mainly concern the manufacture of mechanical parts such as connecting rods, transmission shafts, bearings and engine and compressor components.
  • the invention which is defined in claim 1 relates to the use of a rolled product or spun aluminum alloy composition (% by weight): Si: 1,2 - 2,2 Fe ⁇ 1,5 Cu: 0.2 - 0.8 Mn: 0.6 - 1.5 Mg ⁇ 0.20 Zn ⁇ 0.5 Ti ⁇ 0.10 remains aluminum and unavoidable impurities, in the form of panels or profiles, lacquered, outdoors in the building, signage or decoration.
  • the Si content is between 1.4 and 2%, the copper content between 0.3 and 0.5%, the manganese content between 0.9 and 1.2%, the lower iron content. 0.7% and the magnesium content less than 0.15%.
  • the products used according to the invention are distinguished from 4015 alloy products by a higher copper content and a lower magnesium content.
  • a controlled copper content of between 0.2 and 0.8%, and preferably between 0.3 and 0.5%, leads to an improvement in corrosion resistance, be it pitting corrosion or especially filiform corrosion, which is particularly evident in lacquered products.
  • This corrosion resistance is also favored by a low magnesium content of less than 0.20%, and preferably of 0.15%.
  • the decrease in mechanical strength resulting from the reduction of the magnesium content is more than compensated by the increase of the copper content, so that the mechanical strength is higher than for similar products in 4015.
  • the products used according to the invention have in the naked state a corrosion resistance, measured by the Seawater Acetic Acid Test (SWAAT) puncture depth according to ASTM G85, significantly better than that of 4015 alloy. They can therefore be used in industrial environments. They have in particular, when lacquered, a good resistance to filiform corrosion, and can therefore be used outdoors in the building, signage or decoration in the form of panels or profiles lacquered.
  • SWAAT Seawater Acetic Acid Test
  • Sheet samples were prepared whose thickness (in mm) and chemical composition (in% by weight) are shown in Table 1: Table 1 Alloy e (mm) Yes Fe Cu mn mg AT 1.0 1.61 0.30 0.38 1.05 0.15 B 1.45 1.61 0.30 0.38 1.05 0.15 VS 1.0 1.60 0.58 0.15 1.09 0.28 D 1.45 1.55 0.50 0.17 1.06 0.28 E 1.45 1.59 0.59 0.13 1.16 0.33
  • Alloys A and B are in accordance with the use according to the invention, the alloys C to E are alloys 4015.
  • the manufacturing range is conventional, and comprises a plate casting, a hot rolling, a cold rolling, and a final work hardening in the H 12 state.
  • the breaking strength R m in MPa
  • the conventional yield strength at 0.2% R 0.2 in MPa
  • elongation A 50 in%) according to standard NF EN 10002-1 relating to tensile tests on metallic materials.
  • Table 2 Table 2 Sample rm R 0.2 A 50 AT 176 168 3.2 VS 160 155 4.8
  • alloy sheet A according to the use according to the invention has a better mechanical strength than the sheet of the same thickness of alloy C. which contains less copper but more magnesium.
  • the depths of the pits were measured on the sheets using the SWAAT test, taking into account 5 stitches per sample, and averaging, for 3 samples of the same sheet, maximum depths and mean depths (in ⁇ m). The results are shown in Table 3 / Table 3 Alloy Maximum depth Average depth AT 230 196 B 250 189 VS 660 464 D 700 535 E 730 502
  • Sheet samples were prepared whose thickness (in mm) and chemical composition (in% by weight) are shown in Table 1: Table 1 Alloy e (mm) Yes Fe Cu mn mg AT 1.0 1.59 0.472 0149 1.15 0376 B 1.0 1.49 0329 0376 1.085 0129
  • Alloy A is a 4015 alloy; alloy B is in accordance with the use according to the invention.
  • the manufacturing range is conventional, and comprises a plate casting, a hot rolling, a cold rolling, an intermediate annealing and finally a final work hardening to obtain a state H12.
  • a filiform corrosion test was carried out according to the EN 3665 standard on both types of formats. Before the test, two scratches of 110 mm in length are plotted on each sheet, one in the direction of rolling, the other in the perpendicular direction. A hole with a diameter of 5 mm is also made.
  • alloy B allows a significant improvement in filiform corrosion resistance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Of Metal (AREA)
  • Metal Rolling (AREA)

Abstract

A rolled or drawn product is made from an aluminum alloy with the following composition (by wt %): (a) Si: 1.2 - 2.2; (b) Fe: less than 1.5; (c) Cu : 0.2 - 0.8; (d) Mn: 0.6 - 1.5; (e) Mg: less than 0.20; (f) Zn: less than 0.5; (g) Ti: less than 0.10; (h) the remainder being aluminum and impurities.

Description

Domaine de l'inventionField of the invention

L'invention concerne le domaine de l'utilisation des produits laminés ou filés en alliage d'aluminium de la série 4000 présentant à la fois une bonne résistance mécanique et une bonne résistance à la corrosion, notamment la corrosion filiforme.The invention relates to the field of use of rolled or spun aluminum alloy products of the 4000 series having both good mechanical strength and good resistance to corrosion, including filiform corrosion.

Etat de la techniqueState of the art

Les alliages d'aluminium contenant du silicium comme principal élément d'alliage, correspondant à la série 4000 de la nomenclature de l'Aluminum Association, sont largement utilisés pour la fabrication de pièces moulées. Ils sont par contre plus rarement utilisés sous forme de produits laminés ou filés. Les utilisations sous forme de barres filées ou de profilés sont liées à la bonne tenue à l'usure et à la température des alliages à teneur élevée en silicium, et concernent surtout la fabrication de pièces mécaniques telles que bielles, arbres de transmission, paliers et composants de moteurs et de compresseurs.Aluminum alloys containing silicon as the main alloying element, corresponding to the 4000 series of the nomenclature of the Aluminum Association, are widely used for the manufacture of molded parts. On the other hand, they are rarely used in the form of rolled or spun products. Uses in the form of rods or profiles are related to the good resistance to wear and temperature of high silicon alloys, and mainly concern the manufacture of mechanical parts such as connecting rods, transmission shafts, bearings and engine and compressor components.

Les utilisations sous forme de tôles et bandes concernent essentiellement les articles culinaires émaillés en raison de leur bonne tenue à température élevée, et la couverture des bandes plaquées destinées à la fabrication d'échangeurs thermiques brasés, ces alliages présentant une température de fusion plus basse que les autres alliages et une bonne mouillabilité.Uses in the form of sheets and strips mainly concern enameled cookware because of their good resistance to high temperature, and the coverage of plated strips intended for the manufacture of brazed heat exchangers, these alloys having a lower melting temperature than other alloys and good wettability.

D'autres utilisations ont été parfois proposées dans la littérature, comme par exemple la demande de brevet JP 63-216939 de Kobe Steel qui décrit des bandes plaquées pour la fabrication d'échangeurs thermiques brasés, dont l'alliage d'âme a pour composition (% en poids) :

  • Si : 0,5 - 1,5 Fe < 0,3 Mn : 0,5 - 1,2 Cu : 0,1 - 0,8 Cr ou Zr : 0,05 - 0,35 De même, la demande de brevet JP 09-316577 de Furukawa Electric décrit un alliage d'âme de bandes plaquées pour échangeurs brasés de composition :
    • Si : 0,2 - 2,5 Fe : 0,05 - 2,0 Mn : 0,05 - 2,0 Cu : 0,05 - 2,5
  • La demande de brevet JP 09-256095 de Toyota Motor décrit des tôles en alliage d'aluminium de composition :
    • Si : 0,8 - 3,5 Fe : 0,1 - 1,0 Mn : 0,6 - 1,4 Cu: 0,1 - 0,5
      présentant une bonne formabilité et destinées à la fabrication de pièces embouties, notamment pour la carrosserie automobile, exemptes de lignes de Lüders.
  • Enfin, l'alliage 4015 a été enregistré à l'Aluminum Association en 1989 avec la composition suivante :
    • Si : 1,4 - 2,2 Fe<0,7 Cu < 0,2 Mn: 0,4-1,2 Mg: 0,1 - 0,5 Zn < 0,2
Other uses have sometimes been proposed in the literature, such as for example the patent application JP 63-216939 of Kobe Steel which describes plated strips for the manufacture of soldered heat exchangers, the core alloy of which has the composition (% by weight):
  • If: 0.5 - 1.5 Fe <0.3 Mn: 0.5 - 1.2 Cu: 0.1 - 0.8 Cr or Zr: 0.05 - 0.35 Similarly, the patent application JP 09-316577 from Furukawa Electric describes a core alloy of plated strips for brazed heat exchangers of composition:
    • If: 0.2 - 2.5 Fe: 0.05 - 2.0 Mn: 0.05 - 2.0 Cu: 0.05 - 2.5
  • The patent application JP 09-256095 Toyota Motor describes aluminum alloy sheets of composition:
    • If: 0.8 - 3.5 Fe: 0.1 - 1.0 Mn: 0.6 - 1.4 Cu: 0.1 - 0.5
      having a good formability and intended for the manufacture of stamped parts, in particular for the automobile body, free of Lüders lines.
  • Finally, alloy 4015 was registered at the Aluminum Association in 1989 with the following composition:
    • If: 1.4 - 2.2 Fe <0.7 Cu <0.2 Mn: 0.4-1.2 Mg: 0.1 - 0.5 Zn <0.2

Objet de l'inventionObject of the invention

L'invention qui est définie à la revendication 1 a pour objet l'utilisation d'un produit laminé ou filé en alliage d'aluminium de composition (% en poids) : Si: 1,2 - 2,2 Fe < 1,5 Cu : 0,2 - 0,8 Mn: 0,6 - 1,5 Mg < 0,20 Zn < 0,5 Ti < 0,10 reste aluminium et impuretés inévitables, sous forme de panneaux ou profilés, laqués, en extérieur dans le bâtiment, la signalisation ou la décoration.The invention which is defined in claim 1 relates to the use of a rolled product or spun aluminum alloy composition (% by weight): Si: 1,2 - 2,2 Fe <1,5 Cu: 0.2 - 0.8 Mn: 0.6 - 1.5 Mg <0.20 Zn <0.5 Ti <0.10 remains aluminum and unavoidable impurities, in the form of panels or profiles, lacquered, outdoors in the building, signage or decoration.

De préférence, la teneur en Si est comprise entre 1,4 et 2%, la teneur en cuivre entre 0,3 et 0,5%, la teneur en manganèse entre 0,9 et 1,2%, la teneur en fer inférieure à 0,7% et la teneur en magnésium inférieure à 0,15%.Preferably, the Si content is between 1.4 and 2%, the copper content between 0.3 and 0.5%, the manganese content between 0.9 and 1.2%, the lower iron content. 0.7% and the magnesium content less than 0.15%.

Description de l'inventionDescription of the invention

Les produits utilisés selon l'invention se distinguent des produits en alliage 4015 par une teneur plus élevée en cuivre et une teneur plus réduite en magnésium. De manière inattendue, une teneur contrôlée en cuivre comprise entre 0,2 et 0,8%, et de préférence entre 0,3 et 0,5%, conduit à une amélioration de la résistance à la corrosion, qu'il s'agisse de la corrosion par piqûres ou surtout de la corrosion filiforme, qui se manifeste notamment sur les produits laqués.The products used according to the invention are distinguished from 4015 alloy products by a higher copper content and a lower magnesium content. Unexpectedly, a controlled copper content of between 0.2 and 0.8%, and preferably between 0.3 and 0.5%, leads to an improvement in corrosion resistance, be it pitting corrosion or especially filiform corrosion, which is particularly evident in lacquered products.

Cette résistance à la corrosion est également favorisée par une teneur faible en magnésium, inférieure à 0,20%, et de préférence à 0,15%. La baisse de résistance mécanique résultant de la réduction de la teneur en magnésium est plus que compensée par l'augmentation de la teneur en cuivre, de sorte que la résistance mécanique est plus élevée que pour les produits similaires en 4015. Les produits utilisés selon l'invention présentent à l'état nu une résistance à la corrosion, mesurée par la profondeur de piqûres au test SWAAT (Sea Water Acetic Acid Test) selon la norme ASTM G85, nettement meilleure que celle de l'alliage 4015. Ils peuvent donc être utilisés dans des environnements industriels.
Ils présentent notamment, lorsqu'ils sont laqués, une bonne résistance à la corrosion filiforme, et peuvent donc être utilisés en extérieur dans le bâtiment, la signalisation ou la décoration sous forme de panneaux ou profilés laqués.This corrosion resistance is also favored by a low magnesium content of less than 0.20%, and preferably of 0.15%. The decrease in mechanical strength resulting from the reduction of the magnesium content is more than compensated by the increase of the copper content, so that the mechanical strength is higher than for similar products in 4015. The products used according to the invention have in the naked state a corrosion resistance, measured by the Seawater Acetic Acid Test (SWAAT) puncture depth according to ASTM G85, significantly better than that of 4015 alloy. They can therefore be used in industrial environments.
They have in particular, when lacquered, a good resistance to filiform corrosion, and can therefore be used outdoors in the building, signage or decoration in the form of panels or profiles lacquered.

ExempleExample Exemple 1Example 1

On a préparé des échantillons de tôles dont l'épaisseur (en mm) et la composition chimique (en % en poids) sont indiquées au tableau 1 : Tableau 1 Alliage e (mm) Si Fe Cu Mn Mg A 1,0 1,61 0,30 0,38 1,05 0,15 B 1,45 1,61 0,30 0,38 1,05 0,15 C 1,0 1,60 0,58 0,15 1,09 0,28 D 1,45 1,55 0,50 0,17 1,06 0,28 E 1,45 1,59 0,59 0,13 1,16 0,33 Sheet samples were prepared whose thickness (in mm) and chemical composition (in% by weight) are shown in Table 1: Table 1 Alloy e (mm) Yes Fe Cu mn mg AT 1.0 1.61 0.30 0.38 1.05 0.15 B 1.45 1.61 0.30 0.38 1.05 0.15 VS 1.0 1.60 0.58 0.15 1.09 0.28 D 1.45 1.55 0.50 0.17 1.06 0.28 E 1.45 1.59 0.59 0.13 1.16 0.33

Les alliages A et B sont conformes à l'utilisation selon l'invention, les alliages C à E sont des alliages 4015. La gamme de fabrication est conventionnelle, et comporte une coulée de plaques, un laminage à chaud, un laminage à froid, et un écrouissage final à l'état H 12. On a mesuré sur les échantillons A et C la résistance à la rupture Rm (en MPa), la limite d'élasticité conventionnelle à 0,2% R0,2 (en MPa) et l'allongement A50 (en %) selon la norme NF EN 10002-1 relative aux essais de traction sur matériaux métalliques. Les résultats sont consignés au tableau 2 : Tableau 2 Echantillon Rm R0,2 A50 A 176 168 3,2 C 160 155 4,8 Alloys A and B are in accordance with the use according to the invention, the alloys C to E are alloys 4015. The manufacturing range is conventional, and comprises a plate casting, a hot rolling, a cold rolling, and a final work hardening in the H 12 state. On samples A and C, the breaking strength R m (in MPa) was measured, the conventional yield strength at 0.2% R 0.2 (in MPa). ) and elongation A 50 (in%) according to standard NF EN 10002-1 relating to tensile tests on metallic materials. The results are shown in Table 2: Table 2 Sample rm R 0.2 A 50 AT 176 168 3.2 VS 160 155 4.8

On constate que la tôle en alliage A conforme à l'utilisation selon l'invention présente une meilleure résistance mécanique que la tôle de même épaisseur en alliage C. qui contient moins de cuivre mais plus de magnésium.It is found that the alloy sheet A according to the use according to the invention has a better mechanical strength than the sheet of the same thickness of alloy C. which contains less copper but more magnesium.

On a mesuré sur les 5 tôles les profondeurs de piqûres au test SWAAT, en prenant en compte 5 piqûres par échantillon, et en faisant la moyenne, pour 3 échantillons de la même tôle, des profondeurs maximales et des profondeurs moyennes (en µm). Les résultats sont indiqués au tableau 3/ Tableau 3 Alliage Profondeur maximale Profondeur moyenne A 230 196 B 250 189 C 660 464 D 700 535 E 730 502 The depths of the pits were measured on the sheets using the SWAAT test, taking into account 5 stitches per sample, and averaging, for 3 samples of the same sheet, maximum depths and mean depths (in μm). The results are shown in Table 3 / Table 3 Alloy Maximum depth Average depth AT 230 196 B 250 189 VS 660 464 D 700 535 E 730 502

On constate que la moyenne des profondeurs maximales et la moyenne des profondeurs moyennes des échantillons sont nettement plus faibles pour les alliages selon l'invention que pour les alliages 4015, ce qui est un résultat inattendu compte tenu de l'augmentation de la teneur en cuivre.It can be seen that the average of the maximum depths and the mean of the mean depths of the samples are significantly lower for the alloys according to the invention than for the 4015 alloys, which is an unexpected result given the increase in the copper content. .

Exemple 2Example 2

On a préparé des échantillons de tôles dont l'épaisseur (en mm) et la composition chimique (en % en poids) sont indiquées au tableau 1 : Tableau 1 Alliage e (mm) Si Fe Cu Mn Mg A 1,0 1.59 0.472 0.149 1.15 0.376 B 1,0 1.49 0.329 0.376 1.085 0.129 Sheet samples were prepared whose thickness (in mm) and chemical composition (in% by weight) are shown in Table 1: Table 1 Alloy e (mm) Yes Fe Cu mn mg AT 1.0 1.59 0.472 0149 1.15 0376 B 1.0 1.49 0329 0376 1.085 0129

L'alliage A est un alliage 4015 ; l'alliage B est conforme à l'utilisation selon l'invention.Alloy A is a 4015 alloy; alloy B is in accordance with the use according to the invention.

La gamme de fabrication est conventionnelle, et comporte une coulée de plaques, un laminage à chaud, un laminage à froid, un recuit intermédiaire et enfin un écrouissage final pour obtenir un état H12.The manufacturing range is conventional, and comprises a plate casting, a hot rolling, a cold rolling, an intermediate annealing and finally a final work hardening to obtain a state H12.

Les deux types de tôles ont ensuite subi un laquage liquide précédé d'un traitement de conversion phospho-chromique. Toutes les conditions de traitement et de dépôt sont identiques dans les deux cas.Both types of sheet were then subjected to a liquid lacquer preceded by a phospho-chromic conversion treatment. All treatment and deposit conditions are the same in both cases.

Un test de corrosion filiforme a été mené selon la norme EN 3665 sur les deux types de formats. Avant le test, deux rayures de 110 mm de longueur sont tracées sur chaque tôle, l'une selon le sens de laminage, l'autre dans la direction perpendiculaire. Un trou d'un diamètre de 5 mm est également réalisé.A filiform corrosion test was carried out according to the EN 3665 standard on both types of formats. Before the test, two scratches of 110 mm in length are plotted on each sheet, one in the direction of rolling, the other in the perpendicular direction. A hole with a diameter of 5 mm is also made.

Les résultats sont donnés dans le tableau suivant : Alliage Ech. Longueur maximale de corrosion filiforme à partir de la rayure transversale Longueur maximale de corrosion filiforme à partir de la rayure longitudinale Longueur maximale de corrosion filiforme à partir du trou A 1 4.5 1.5 2.0 2 4.0 1.2 1.7 3 4.2 1.5 3.0 Moy. 4.2 1.4 2.2 B 1 2.5 1.0 1.0 2 1.2 1.0 1.2 3 2.6 0.8 2.4 Moy. 2.1 0.9 1.5 The results are given in the following table: Alloy Ech. Maximum length of filiform corrosion from the transverse stripe Maximum length of filiform corrosion from the longitudinal stripe Maximum length of filiform corrosion from the hole AT 1 4.5 1.5 2.0 2 4.0 1.2 1.7 3 4.2 1.5 3.0 Avg. 4.2 1.4 2.2 B 1 2.5 1.0 1.0 2 1.2 1.0 1.2 3 2.6 0.8 2.4 Avg. 2.1 0.9 1.5

L'utilisation de l'alliage B permet une amélioration significative de la résistance à la corrosion filiforme.The use of alloy B allows a significant improvement in filiform corrosion resistance.

Claims (5)

  1. Outdoor use in the building industry, signposting or decoration, in the form of enameled panels or profiles, of a flat-rolled or spun aluminum alloy product composed as follows (% by weight):
    Si: 1.2 - 2.2 Fe < 1.5 Cu: 0.2 - 0.8 Mn: 0.6 - 1.5 Mg < 0.20
    Zn < 0.5 Ti<0.10 aluminum and inevitable impurities remain.
  2. Use according to claim 1, characterized in that the silicon content of the alloy is between 1.4 and 2%.
  3. Use according to either of claims 1 or 2, characterized in that the copper content of the alloy is between 0.3 and 0.5%.
  4. Use according to any of claims 1 or 3, characterized in that the manganese content of the alloy is between 0.9 and 1.2%.
  5. Use according to one of claims 1 to 4, characterized in that the magnesium content is lower than 0.15%.
EP04356088A 2003-06-05 2004-06-03 Use of a rolled or extruded aluminium alloy product having a good corrosion resistance Expired - Lifetime EP1484421B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0306783A FR2855833B1 (en) 2003-06-05 2003-06-05 LAMINATED OR ALUMINUM ALLOY PRODUCT WITH GOOD RESISTANCE TO CORROSION
FR0306783 2003-06-05

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EP1484421A1 EP1484421A1 (en) 2004-12-08
EP1484421B1 true EP1484421B1 (en) 2009-03-11

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US20170175230A1 (en) * 2014-07-04 2017-06-22 Aleris Rolled Products Germany Gmbh Aluminium alloy for use in the building industry
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DE602004019840D1 (en) 2009-04-23
EP1484420A1 (en) 2004-12-08
EP1484421A1 (en) 2004-12-08
ATE425273T1 (en) 2009-03-15
FR2855833A1 (en) 2004-12-10
EP1484420B1 (en) 2010-06-02
ATE469990T1 (en) 2010-06-15
FR2855833B1 (en) 2007-03-16
DE602004027443D1 (en) 2010-07-15

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