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US20200332406A1 - Corrosion resistant aluminum electrode alloy - Google Patents

Corrosion resistant aluminum electrode alloy Download PDF

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Publication number
US20200332406A1
US20200332406A1 US16/922,209 US202016922209A US2020332406A1 US 20200332406 A1 US20200332406 A1 US 20200332406A1 US 202016922209 A US202016922209 A US 202016922209A US 2020332406 A1 US2020332406 A1 US 2020332406A1
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Prior art keywords
aluminum alloy
alloy body
vol
ppm
bearing particles
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US16/922,209
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English (en)
Inventor
Hasso Weiland
Stephen F. Baumann
Eider A. Simielli
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Arconic Technologies LLC
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Arconic Technologies LLC
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Priority to US16/922,209 priority Critical patent/US20200332406A1/en
Assigned to ARCONIC INC. reassignment ARCONIC INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEILAND, HASSO, SIMIELLI, Eider A., BAUMANN, STEPHEN F.
Assigned to ARCONIC TECHNOLOGIES LLC reassignment ARCONIC TECHNOLOGIES LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARCONIC INC.
Publication of US20200332406A1 publication Critical patent/US20200332406A1/en
Abandoned 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
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—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
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • 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
    • C22F1/047—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 magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C25B11/0431—
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/055—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material
    • C25B11/057—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the substrate or carrier material consisting of a single element or compound
    • C25B11/061—Metal or alloy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8825—Methods for deposition of the catalytic active composition
    • H01M4/8853—Electrodeposition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present disclosure is directed towards aluminum electrode alloys with improved corrosion resistance.
  • Clean, sustainable energy is a global concern. Electrochemical cells are utilized as clean, sustainable energy. By commercially deploying these sustainable forms of energy, it is possible to lower the global dependence on fossil fuels.
  • Utilizing aluminum alloy compositions as an aluminum electrode (e.g., anode) alloy product in an electrochemical cell can be evaluated by quantifying and/or qualifying two phenomena: (1) the anodic reaction and (2) the corrosion reaction of the aluminum electrode alloy composition.
  • aluminum reacts with hydroxyl ions which results in the release of electrons, the primary and desirable product of an electrochemical cell.
  • the aluminum in the aluminum electrode (e.g., anode) product material is oxidized in the presence of water and as the oxygen in the water reacts with the aluminum, aluminum oxide is formed, generating hydrogen gas (e.g. a byproduct of the corrosion reaction of the aluminum anode alloy composition).
  • the extent of corrosion reaction i.e. the amount of hydrogen generated for an aluminum electrode alloy product used as an anode, is a function of electrolyte temperatures and current densities in the electrochemical cell. As operating temperatures and applied current vary for the operation of the cell, so too does the aluminum electrode alloy composition experience varying instances of high anodic reaction and high corrosion reaction windows within the operating parameters/ranges of the electrolytic cell.
  • the present disclosure is directed towards aluminum alloys with improved corrosion resistance when employed as an electrode in an electrochemical cell. More specifically, the present disclosure is directed towards iron-containing aluminum anode alloys having compositions including, for example, not greater than 0.06 wt. % Fe not greater than 5.0 wt. % Mg, and a corresponding heat treatment to configure the iron in solid solution, such that the resulting composition is configured with corrosion resistance when evaluated in accordance with hydrogen generation in an electrochemical half-cell test.
  • a method may include the step of (a) preparing an aluminum alloy body for solutionizing.
  • the aluminum alloy body may include not greater than 0.06 wt. % Fe, where at least some Fe is present.
  • the aluminum alloy body may include not greater than 5.0 wt. % Mg, with the balance being aluminum and unavoidable impurities.
  • the aluminum alloy product may include a first vol. % of Fe-bearing particles.
  • the method may include the step of (b) solutionizing the as-prepared aluminum alloy body.
  • the solutionizing step (b) may include dissolving at least some of the Fe-bearing particles into solid solution, thereby decreasing the first vol. % of Fe-bearing particles to a second vol. % of Fe-bearing particles in the as-solutionized aluminum alloy body.
  • the Fe-bearing particles may dissolve into a matrix of the aluminum alloy body.
  • the method may comprise quenching of the aluminum alloy body.
  • the solutionizing step may include solution heat treating and quenching, where the quenching may reduce the temperature of the aluminum alloy body at a rate of at least 38° C. per second.
  • the temperature of the aluminum alloy body immediately before quenching is higher than the temperature of the aluminum alloy body during quenching.
  • the quenching may reduce the temperature of the aluminum alloy body at a rate of: at least 93° C. per second; or at least 204° C. per second; or at least 427° C. per second; or at least 871° C. per second or at least 1760° C. per second; or at least 3538° C. per second; or at least 5538° C. per second.
  • the quenching may be accomplished to bring the aluminum alloy body to a low temperature (e.g., due to a subsequent cold working step).
  • the quenching may comprise cooling the aluminum alloy body to a temperature of not greater than 93° C. (i.e., the temperature of the aluminum alloy body upon completion of the quenching step is not greater than 93° C.).
  • the quenching may comprise cooling the aluminum alloy body to a temperature of not greater than 65° C.
  • the quenching may comprise cooling the aluminum alloy body to a temperature of not greater than 38° C.
  • the quenching may comprise cooling the aluminum alloy body to ambient temperature.
  • the quenching may be accomplished via any suitable cooling medium.
  • the quenching may comprise contacting the aluminum alloy body with a gas.
  • the gas may be air.
  • the quenching may comprise contacting the aluminum alloy body with a liquid.
  • the liquid may be aqueous based, such as water or another aqueous based cooling solution.
  • the liquid may be an oil.
  • the oil may be hydrocarbon based.
  • the oil may be silicone based.
  • ambient air cooling may be used.
  • the aluminum alloy body may be suitable for use as an aluminum electrode alloy product.
  • the method may include determining, prior to the solutionizing step (b), conditions for the solutionizing step (b).
  • the conditions may include a soak temperature range of from 515° C. to a Temperature2 (C).
  • a value of Temperature2 may be dependent on an actual wt. % Mg of the aluminum alloy body.
  • Temperature2 644.6 ⁇ [15.73*(actual wt. % Mg)].
  • the method may include completing the solutionizing step (b) according to the determining step.
  • the method may include selecting a value for a target temperature (° C.) within the soak temperature range.
  • the conditions may include a soak time range of from Time1 (hours) to Time2 (hours).
  • Time1 1.2141 ⁇ 10 8 *e ⁇ circumflex over ( ) ⁇ (0.032516*target temperature)
  • Time2 1.4467 ⁇ 10 10 *e ⁇ circumflex over ( ) ⁇ (0.032828*target temperature).
  • the method may include determining, prior to the solutionizing step (b), conditions for the solutionizing step (b).
  • the conditions may include a soak temperature within 50° C. and less than a solidus temperature of the as-prepared aluminum alloy body.
  • the method may include completing the solutionizing step (b) according to the determining step.
  • the determined conditions may include a soak temperature that may be: within 40° C. and less than the solidus temperature of the as-prepared aluminum alloy body; or within 30° C. and less than the solidus temperature of the as-prepared aluminum alloy body; or within 20° C. and less than the solidus temperature of the as-prepared aluminum alloy body; or within 10° C. and less than the solidus temperature of the as-prepared aluminum alloy body; or within 5° C. and less than the solidus temperature of the as-prepared aluminum alloy body.
  • the second vol. % of Fe-bearing particles in the as-solutionized aluminum alloy body may be: at least 5% less than the first vol. % of Fe-bearing particles in the as-prepared aluminum alloy body; or at least 10% less than the first vol. % of Fe-bearing particles in the as-prepared aluminum alloy body; or at least 25% less than the first vol. % of Fe-bearing particles in the as-prepared aluminum alloy body; or at least 50% less than the first vol. % of Fe-bearing particles in the as-prepared aluminum alloy body; or at least 75% less than the first vol. % of Fe-bearing particles in the as-prepared aluminum alloy body; or at least 90% less than the first vol. % of Fe-bearing particles in the as-prepared aluminum alloy body.
  • the aluminum alloy body may include at least some Fe.
  • the Fe may be present in the aluminum alloy body only as an unavoidable impurity.
  • the Fe may be present in the aluminum alloy body as a purposefully added alloying element.
  • the aluminum alloy body may include 20-600 ppm Fe. In one embodiment of the method, the aluminum alloy body may include 20-400 ppm Fe.
  • the aluminum alloy body may include Fe in the amount of: at least 1 ppm; at least 5 ppm; at least 10 ppm; at least 20 ppm; at least 30 ppm; at least 40 ppm; at least 50 ppm; at least 70 ppm; at least 95 ppm; at least 100 ppm; at least 150 ppm; at least 182 ppm; at least 200 ppm; at least 250 ppm; at least 300 ppm; at least 350 ppm; at least 400 ppm; at least 450 ppm; at least 500 ppm; at least 550 ppm; or at least 600 ppm Fe.
  • the aluminum alloy body may include Fe in the amount of: not greater than 1 ppm; not greater than 5 ppm; not greater than 10 ppm; not greater than 20 ppm; not greater than 30 ppm; not greater than 40 ppm; not greater than 50 ppm; not greater than 70 ppm; not greater than 100 ppm; not greater than 150 ppm; not greater than 182 ppm; not greater than 200 ppm; not greater than 250 ppm; not greater than 300 ppm; not greater than 350 ppm; not greater than 400 ppm; not greater than 450 ppm; not greater than 500 ppm; not greater than 550 ppm; or not greater than 600 ppm Fe.
  • the aluminum alloy body may include at least some Mg.
  • the Mg may be present in the aluminum alloy body only as an unavoidable impurity.
  • the Mg may be present in the aluminum alloy body as a purposefully added alloying element.
  • the aluminum alloy body may include Mg in the amount of: at least 1 ppm; at least 5 ppm; at least 10 ppm; at least 25 ppm; at least 50 ppm; at least 100 ppm; at least 250 ppm; at least 500 ppm; at least 1000 pp; at least 5000 ppm; at least 10000 ppm; at least 15000 ppm; at least 20000 ppm; at least 24200 ppm; at least 24500 ppm; at least 25000 ppm; at least 25200 ppm; at least 25800 ppm; at least 30000 ppm; at least 35000 ppm; at least 40000 ppm; at least 45000 ppm; or at least 50000 ppm Mg.
  • the aluminum alloy body may include Mg in the amount of: not greater than 1 ppm; not greater than 5 ppm; not greater than 10 ppm; not greater than 25 ppm; not greater than 50 ppm; not greater than 100 ppm; not greater than 250 ppm; not greater than 500 ppm; not greater than 1000 ppm; not greater than 5000 ppm; not greater than 10000 ppm; not greater than 15000 ppm; not greater than 20000 ppm; not greater than 24200 ppm; not greater than 24500 ppm; not greater than 25000 ppm; not greater than 25200 ppm; not greater than 25800 ppm; not greater than 30000 ppm; not greater than 35000 ppm; not greater than 40000 ppm; not greater than 45000 ppm; or not greater than 50000 ppm Mg.
  • the aluminum alloy body may include one of a 1xxx, 2xxx, 3xxx, 4xxx, 5xxx, 6xxx, 7xxx, and 8xxx aluminum alloy.
  • the aluminum alloy body may include an aluminum alloy selected from the group consisting of: a 1xxx aluminum alloy, a 3xxx aluminum alloy, and a 5xxx aluminum alloy.
  • the aluminum alloy body may be a 5xxx aluminum alloy.
  • the aluminum alloy body may include an aluminum alloy having at least 90 wt. % Al.
  • a corrosion resistance of an as-solutionized aluminum electrode alloy product may be greater as compared to the corrosion resistance of a reference aluminum electrode alloy product (i.e., a “control” aluminum alloy body prepared in the same manner as the “sample” aluminum alloy body, but not solutionized according to one or more embodiments of the methods disclosed herein), when measured in accordance with an electrochemical cell test.
  • the preparing step (a) may include working the aluminum alloy body into a sheet or plate.
  • the working may include at least one of hot rolling and cold rolling the aluminum alloy body.
  • the preparing step (a) may include forming a melt of an aluminum alloy.
  • the preparing step may include casting the melt to form the aluminum alloy body.
  • the casting step may include one of direct chill casting, continuous casting, and shape casting.
  • the preparing step (a) may include additively manufacturing the aluminum alloy body.
  • unavoidable impurities means the presence of an undesirable component.
  • an unavoidable impurity is present in a quantity or amount that is low enough to not change a desired property and/or characteristic (i.e. below a threshold to modify the corrosion resistance of the corrosion resistant aluminum electrode alloy and/or reduce the corrosion resistance below a certain margin of improvement when compared to the reference aluminum electrode alloy material evaluated in an electrochemical cell test).
  • solutionize means heating an aluminum alloy body to a suitable temperature, generally above the solvus temperature, holding at that temperature long enough to allow soluble elements to enter into solid solution, and cooling rapidly enough to hold the elements in solid solution.
  • the solid solution formed at high temperature may be retained in a supersaturated state by cooling with sufficient rapidity to restrict the precipitation of the solute atoms as coarse, incoherent particles.
  • “Solutionizing” may include quenching of the aluminum alloy body, which quenching may be accomplished via a liquid (e.g., via an aqueous or organic solution), a gas (e.g., air cooling), or even a solid (e.g., cooled solids on one or more sides of the aluminum alloy body).
  • the quenching step may include contacting the aluminum alloy body with a liquid or a gas.
  • the quenching may occur in the absence of hot working and/or cold working of the aluminum alloy body.
  • the quenching may occur by immersion, spraying and/or jet drying, among other techniques, and in the absence of deformation of the aluminum alloy body.
  • wash temperature means the temperature or range of temperatures at which the aluminum alloy body is held during solution heat treatment.
  • wash time means the residence time or range of residence times for which the aluminum alloy body is held at the soak temperature during solution heat treatment.
  • reference aluminum electrode alloy means an iron-containing aluminum alloy in an aluminum alloy body prepared according to disclosed preparing step (a), but without being subject to the disclosed solutionizing step (b) of the method described herein.
  • reference aluminum electrode alloy product means an aluminum electrode (e.g., anode) alloy product formed from the reference aluminum electrode alloy.
  • the term “or” is an inclusive “or” operator, and is equivalent to the term “and/or,” unless the context clearly dictates otherwise.
  • the term “based on” is not exclusive and allows for being based on additional factors not described, unless the context clearly dictates otherwise.
  • the meaning of “a,” “an,” and “the” include plural references.
  • the meaning of “in” includes “in” and “on”.
  • FIG. 1 is a schematic view of an example of an electrochemical cell that is configured for use in evaluating the corrosion of electrodes in an electrolyte in accordance with the present disclosure.
  • FIG. 2 is a graph showing hydrogen gas generation and vol. % of Fe-bearing particles for solutionized and non-solutionized alloys for four different alloy compositions.
  • Aluminum alloys 1-4 having the compositions shown in Table 1, below, were cast as ingots and rolled to the desired thickness.
  • the reference and sample disks were tested for corrosion resistance (hydrogen generation) via an electrochemical cell system (schematically depicted in FIG. 1 ).
  • the electrochemical cell consists of a counter electrode and an aluminum electrode (the reference or sample) alloy product submerged in an aqueous electrolyte.
  • the electrochemical cell is equipped with a mass-flow meter for measuring hydrogen gas (i.e., H 2 ) evolved from the aluminum electrode alloy product. Current is applied on the aluminum electrode alloy product, and flows through the electrolyte and into the counter electrode.
  • hydrogen gas i.e., H 2
  • the reference and sample disks were tested according to the following procedure.
  • a predefined temperature-and-current step control program was applied to the cell so that the hydrogen evolution rate was measured over a set range of operating temperatures, i.e. between room temperature and 100° C. and over a set of current densities, ranging from 0 to 300 mA/cm 2 .
  • the reference and sample disks were run under identical conditions including electrolyte temperature, applied current, and test duration. Results were generated based on hydrogen gas generation, by accumulating the overall amount of hydrogen measured by the mass flow meter. The hydrogen generation was normalized to the surface area of each electrode. Without being bound by a particular mechanism theory, it is believed that the overall amount of hydrogen generated by the system corresponds to the corrosion reaction (undesired reaction). Thus, the less hydrogen produced, the more corrosion resistant the aluminum electrode alloy product is that is being evaluated.
  • sample disks (i.e. solutionized) from Alloys 2, 3 and 4 generated less hydrogen (11.3, 14.4, and 53.2 cc/cm 2 , respectively) than reference disks (i.e. non-solutionized) with the same composition (54.2, 75.5 and 115.1 cc/cm 2 , respectively). Both sample and reference disks from Alloy 1 produced the same amount of hydrogen.
  • higher amounts of undissolved impurities, such as iron, in an aluminum electrode alloy may result in an increased hydrogen generation (when compared to an aluminum electrode alloy having a lower amount of undissolved impurities).
  • the aluminum electrode alloys of the present disclosure are configured with up to 5.0 wt. % Mg, as discussed above.
  • lower hydrogen generation i.e., reduced corrosion
  • the disclosed Fe-containing aluminum electrode alloy products having up to 0.06 wt. % Fe and up to 5.0 wt. % Mg, as compared to the baseline (i.e., reference, non-solutionized) Fe-containing aluminum electrode alloy products.
  • lower hydrogen generation e.g. reduced corrosion
  • these aluminum electrode alloy products as compared to baseline (i.e., reference, non-solutionized) aluminum electrode alloy products may be achieved at Fe levels of 5-182 ppm and Mg levels of not greater than 2.6 wt. %.
  • a minimum of 40 backscattered electron images were captured at both the center (T/2) and near the outer edge (sample surface) of the metallographically prepared (per step 1, above) sections, thus providing a minimum of 80 images total per section.
  • the image size was 2048 pixels by 1600 pixels at a magnification of 1000 ⁇ .
  • the accelerating voltage was 7.5 kV at a working distance of 7.5 mm and spot size of 5.
  • the contrast and brightness was set so that the average matrix grey level of the 8-bit digital image was approximately 128 and the darkest and brightest phases were 0 (black) and 255 (white), respectively.
  • the average matrix grey level and standard deviation were calculated for each SEM image.
  • the average atomic number of the secondary phase particles of interest is higher than the matrix (the aluminum matrix), so the secondary phase particles appeared lighter in the image representations.
  • the pixels that make up the particles were defined as any pixel that had a grey level higher than (>) the average matrix grey level plus 3.5 standard deviations. This critical grey level was defined as the threshold.
  • a binary image was created by discriminating the grey level image to make all pixels higher than the threshold to be white (255) and all pixels at or lower than the threshold to be black (0).
  • the area fraction of particles was calculated as the total number of white pixels divided by the total number of pixels. This fraction was calculated for each image for a single location, and then averaged.
  • the total area fraction (AF) for a given sample was then calculated as a weighted average of the area fraction at T/2 and near the surface, where the near surface number was weighted twice because it occurred twice in the sample. Area fraction was then converted into a percent by multiplying by 100. The volume percent of the Fe-bearing particles in the product was then determined based on Equation (I):
  • sample disks from Alloys 1-4 all had a lower vol. % of Fe-particles (0.00014, 0.00003, 0.00000, and 0.01022 vol. %, respectively) as compared to reference disks of Alloys 1-4 (0.0046, 0.01115, 0.02335, and 0.04401 vol. %, respectively).
  • higher amounts of undissolved iron in an aluminum alloy body may result in increased vol. % of Fe-bearing particles (when compared to an aluminum alloy body having a lower amount of undissolved iron).
  • vol. % of Fe-bearing particles when compared to an aluminum alloy body having a lower amount of undissolved iron.
  • at least some of the iron may be dissolved into solid solution, which is believed to reduce the vol. % of Fe-bearing particles and thereby improve the corrosion resistance, as described above in Example 2.

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WO1987000206A1 (fr) * 1985-07-08 1987-01-15 Allied Corporation Alliages en aluminium ductiles, de faible densite et de resistan ce elevee et procede de fabrication
JP2907380B2 (ja) * 1995-04-06 1999-06-21 古河電気工業株式会社 Ａｌ−Ｍｇ系合金の抵抗スポット溶接方法
JP2001329329A (ja) * 2000-03-15 2001-11-27 Ykk Corp 高延性・耐摩耗性アルミニウム合金
US20110132504A1 (en) * 2004-04-05 2011-06-09 Nippon Light Metal Company, Ltd. Aluminum Alloy Casting Material for Heat Treatment Excelling in Heat Conduction and Process for Producing the Same
EP3097216B1 (fr) * 2014-01-21 2020-01-15 Arconic Inc. Alliages d'aluminium 6xxx

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