EP0645467A1 - Procédé de désensibilisation à la corrosion intercristalline des alliages d'aluminium, séries 2000 et 6000 et produits correspondants - Google Patents

Procédé de désensibilisation à la corrosion intercristalline des alliages d'aluminium, séries 2000 et 6000 et produits correspondants Download PDF

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Publication number
EP0645467A1
EP0645467A1 EP94420256A EP94420256A EP0645467A1 EP 0645467 A1 EP0645467 A1 EP 0645467A1 EP 94420256 A EP94420256 A EP 94420256A EP 94420256 A EP94420256 A EP 94420256A EP 0645467 A1 EP0645467 A1 EP 0645467A1
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EP
European Patent Office
Prior art keywords
alloys
series
corrosion
intercrystalline corrosion
states
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Withdrawn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
EP94420256A
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German (de)
English (en)
French (fr)
Inventor
Pierre Sainfort
Jean Domeyne
Timothy Warner
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.)
Constellium Issoire SAS
Original Assignee
Pechiney Rhenalu SAS
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 Pechiney Rhenalu SAS filed Critical Pechiney Rhenalu SAS
Publication of EP0645467A1 publication Critical patent/EP0645467A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent

Definitions

  • the present invention relates to a method for desensitizing to intercrystalline corrosion (CI) of aluminum alloys belonging to the 2000 and 6000 series of the nomenclature of the Aluminum Association and the corresponding products.
  • CI intercrystalline corrosion
  • the 2000 (or 6000) alloys concerned contain respectively Cu or Cu + Mg (or Si + Mg or Si + Mg + Cu) as main elements, possible minor elements such as Mn , Cr, Zr, Zn, Ag and unavoidable processing impurities such as Fe up to 1% and Si up to 1% (in 2000 alloys only in the latter case), other elements, including Li, with a maximum content of 0.05% each and 0.15% in total. (Unless otherwise indicated, the compositions refer to the weight content).
  • the alloys concerned are dissolved, quenched, possibly hardened by controlled deformation and cured and / or tempered. In this state, these alloys are sensitive to intercrystalline corrosion, which limits their use in aggressive conditions, in particular in a marine atmosphere for long exposures.
  • the method according to the invention consists, in the range of heat treatment of these alloys, in practicing a solution in a temperature range located from 10 to 100 ° C below the conventional solution temperature (Tms) .
  • this temperature range is preferably kept from 10 to 30 ° C below Tms.
  • alloys 6013 or 6056, used in T6, T6xx or under-income states or delivered in T3xx or T4 states it is required from 10 to 100 ° C below Tms.
  • the Tms solution temperature is known to those skilled in the art.
  • this dissolution temperature generally corresponds to obtaining a solid solution most saturated with hardening elements, compatible with the chemical composition of the alloy considered and the practical constraints of industrial heat treatments.
  • the applicant company noted that the products desensitized to IC could be characterized by two physical parameters, taken individually or in combination. This is the conductivity electrical surface and AED signal.
  • the surface electrical conductivity of the alloys according to the invention is at least 0.7 MS / m higher than that of the alloys according to the prior art treated under analogous conditions, except as regards the solution temperature.
  • the energy associated with the AED peak relating to the fusion of the eutectics of the alloys according to the invention, determined under the conditions reported below, is at least 3 J / g (in absolute value) greater than that relating to the corresponding peak classic alloys.
  • the AED thermograms are plotted at a heating rate of 20 ° C / min on samples of approximately 50 mg (PERKIN ELMER DSC7 device).
  • the first temperature (495 ° C) corresponds to the "classic" solution of the alloy.
  • a 2000 x 1000 mm sheet of alloy 6013 with a composition by weight: 0.82% Si; 0.22% Fe; 0.92% Cu; 0.9% Mg; 0.62% Mn; 0.15% Zn; ⁇ 0.08% Ti and 6 mm thick was dissolved under the conditions reported in Table II, operation followed by quenching in cold water, two days maturation and tempering of the type T6 (6 hours at 175 ° C).
  • a comparison is made with a conventional solution treatment (30 minutes at 550 ° C.), followed by quenching in cold water, two days maturation and an income of the T6 type (6 hours at 175 ° C).
  • alloys treated according to the invention have a resistance to intercrystalline corrosion substantially improved compared to that of those obtained according to the prior art.
  • the alloys obtained according to the invention can be used in particular in the field of mechanical engineering and transport industries (rail, automobile, aeronautics, maritime).

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Electroplating Methods And Accessories (AREA)
EP94420256A 1993-09-28 1994-09-26 Procédé de désensibilisation à la corrosion intercristalline des alliages d'aluminium, séries 2000 et 6000 et produits correspondants Withdrawn EP0645467A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9311861A FR2710657B1 (fr) 1993-09-28 1993-09-28 Procédé de désensibilisation à la corrosion intercristalline des alliages d'Al séries 2000 et 6000 et produits correspondants.
FR9311861 1993-09-28

Publications (1)

Publication Number Publication Date
EP0645467A1 true EP0645467A1 (fr) 1995-03-29

Family

ID=9451554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94420256A Withdrawn EP0645467A1 (fr) 1993-09-28 1994-09-26 Procédé de désensibilisation à la corrosion intercristalline des alliages d'aluminium, séries 2000 et 6000 et produits correspondants

Country Status (7)

Country Link
US (1) US5643372A (ko)
EP (1) EP0645467A1 (ko)
JP (1) JPH07180004A (ko)
KR (1) KR950008711A (ko)
AU (1) AU680014B2 (ko)
CA (1) CA2130766A1 (ko)
FR (1) FR2710657B1 (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2726007B1 (fr) * 1994-10-25 1996-12-13 Pechiney Rhenalu Procede de fabrication de produits en alliage alsimgcu a resistance amelioree a la corrosion intercristalline
US7275582B2 (en) * 1999-07-29 2007-10-02 Consolidated Engineering Company, Inc. Methods and apparatus for heat treatment and sand removal for castings
US20020104596A1 (en) * 2001-02-02 2002-08-08 Consolidated Engineering Company, Inc. Integrated metal processing facility
US7338629B2 (en) * 2001-02-02 2008-03-04 Consolidated Engineering Company, Inc. Integrated metal processing facility
WO2004009855A1 (en) * 2002-07-18 2004-01-29 Consolidated Engineering Company, Inc. Method and system for processing castings
US20060054294A1 (en) * 2004-09-15 2006-03-16 Crafton Scott P Short cycle casting processing
US20060103059A1 (en) * 2004-10-29 2006-05-18 Crafton Scott P High pressure heat treatment system
EP2489452A3 (en) * 2007-03-29 2013-05-01 Consolidated Engineering Company, Inc. System and method for forming and heat treating metal castings
CN107532268B (zh) 2015-04-28 2019-12-03 联合工程公司 用于对铝合金铸件进行热处理的***和方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1463418A (fr) * 1965-03-04 1966-12-23 Ver Leichtmetallwerke Gmbh Procédé d'amélioration de la résistance à la corrosion sous tension des pièces matricées et forgées en alliages d'aluminium sensibles à ce genre de corrosion
GB1306206A (ko) * 1971-03-16 1973-02-07
FR2278785A1 (fr) * 1974-01-07 1976-02-13 Pechiney Aluminium Procede de renforcement des caracteristiques mecaniques d'alliages d'aluminium a traitement thermique et produits ainsi obtenus
FR2293497A2 (fr) * 1974-12-04 1976-07-02 Pechiney Aluminium Amelioration de la resistance a la corrosion sous tension d'alliages a base d'aluminium de la serie des a-u4sg
FR2333053A1 (fr) * 1975-11-25 1977-06-24 Cegedur Procede de preparation de toles d'aluminium destinees a etre soudees, a resistance a la corrosion amelioree
FR2370105A2 (fr) * 1976-11-08 1978-06-02 Cegedur Procede de preparation de toles d'aluminium destinees a etre soudees, a resistance a la corrosion amelioree

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE639908A (ko) * 1962-11-15
US3305410A (en) * 1964-04-24 1967-02-21 Reynolds Metals Co Heat treatment of aluminum
US3198676A (en) * 1964-09-24 1965-08-03 Aluminum Co Of America Thermal treatment of aluminum base alloy article

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1463418A (fr) * 1965-03-04 1966-12-23 Ver Leichtmetallwerke Gmbh Procédé d'amélioration de la résistance à la corrosion sous tension des pièces matricées et forgées en alliages d'aluminium sensibles à ce genre de corrosion
GB1306206A (ko) * 1971-03-16 1973-02-07
FR2278785A1 (fr) * 1974-01-07 1976-02-13 Pechiney Aluminium Procede de renforcement des caracteristiques mecaniques d'alliages d'aluminium a traitement thermique et produits ainsi obtenus
FR2293497A2 (fr) * 1974-12-04 1976-07-02 Pechiney Aluminium Amelioration de la resistance a la corrosion sous tension d'alliages a base d'aluminium de la serie des a-u4sg
FR2333053A1 (fr) * 1975-11-25 1977-06-24 Cegedur Procede de preparation de toles d'aluminium destinees a etre soudees, a resistance a la corrosion amelioree
FR2370105A2 (fr) * 1976-11-08 1978-06-02 Cegedur Procede de preparation de toles d'aluminium destinees a etre soudees, a resistance a la corrosion amelioree

Also Published As

Publication number Publication date
CA2130766A1 (fr) 1995-03-29
AU680014B2 (en) 1997-07-17
US5643372A (en) 1997-07-01
AU7149594A (en) 1995-04-13
FR2710657B1 (fr) 1995-11-10
KR950008711A (ko) 1995-04-19
FR2710657A1 (fr) 1995-04-07
JPH07180004A (ja) 1995-07-18

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