• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:ES2870139T9
    申请号:ES17788454T
    申请日:2017-04-10
    公开日:2022-01-03
    发明作者:Nicholas C Parson；Raynald Guay
    申请人:Rio Tinto Alcan International Ltd；
    IPC主号:
    专利说明:

    [0002] Corrosion resistant alloy for extruded and brazed products
    [0004] TECHNOLOGICAL FIELD
    [0006] The present disclosure relates to aluminum alloys for making extruded and brazed aluminum products that have improved corrosion resistance while maintaining their tensile properties, extrusion properties, and weldability, as well as exhibiting appropriate grain size. to promote good formability.
    [0008] BACKGROUND
    [0010] AA3003 aluminum alloy is widely used to make extruded, optionally drawn and brazed products. However, the applications of AA3003 aluminum alloy are limited due to its poor corrosion resistance. Importantly, AA3003 has insufficient corrosion resistance to meet the increasingly stringent requirements of the automotive and air conditioning industries.
    [0012] It would be highly desirable to have an aluminum alloy for making extruded and brazed aluminum products that has, compared to extruded and brazed aluminum products made from the AA3003 aluminum alloy, improved corrosion resistance. while maintaining (or improving) tensile properties and acceptable post brazing grain size. EP 1349 965 describes a brazing alloy based on the 3000 series used for the manufacture of tubes in heat exchangers.
    [0014] SHORT SUMMARY
    [0016] The aluminum alloys of the present disclosure are for making extruded and brazed products with improved corrosion resistance (provided by a deliberate addition of Zn and optionally a low Cu content) while maintaining tensile properties (provided by an addition deliberate addition of Mn and Mg) and acceptable grain size (after brazing) (provided by a deliberate addition of Fe and optionally low Si content). The present disclosure also provides the aluminum alloy in the form of extrusion ingots, extruded and brazed products obtained from the aluminum alloy, as well as processes for obtaining extruded and brazed aluminum products from the aluminum alloy. aluminum.
    [0018] The invention is provided in the claims.
    [0020] DETAILED DESCRIPTION
    [0022] In accordance with the present disclosure, aluminum alloys are provided for making extruded and brazed (optionally drawable) aluminum products. The aluminum alloys of the present disclosure limit corrosion, retain tensile properties, and provide proper grain size in aluminum products comprising them. Aluminum alloys comprise Zn to improve corrosion resistance in the resulting extruded and brazed aluminum products. The aluminum alloys preferably comprise between at least about 0.10 Zn and no more than about 0.20 Zn to achieve increased corrosion resistance in the resulting extruded and brazed aluminum products. Optionally, the aluminum alloys comprise a low Cu content to promote corrosion resistance in the resulting extruded and brazed aluminum products. Aluminum alloys comprise a combination of Mn and Mg to maintain or improve the tensile properties (and especially the ultimate tensile strength) of the resulting extruded and brazed aluminum product. The aluminum alloys preferably comprise at least about 0.9 Mn and at most about 1.2 Mn to achieve maintenance or enhancement of tensile properties in the resulting extruded and brazed aluminum products. Aluminum alloys preferably comprise at least about 0.03 Mg and no more than about 0.10 Mg to achieve maintenance or enhancement of tensile properties in the resulting extrudates and brazes. Aluminum alloys preferably comprise a combined weight percent of Mg and Mn equal to or greater than about 0.99. The aluminum alloy also comprises Fe to achieve grain size maintenance or reduction in the resulting extruded and brazed aluminum products. The aluminum alloys preferably comprise at least about 0.15 Fe and no more than about 0.30 Fe to achieve maintenance or decrease in grain size in the resulting extruded and brazed aluminum products. Optionally, the aluminum alloys comprise a low Si content to promote proper grain size in the resulting extruded and brazed aluminum products. The present disclosure also provides the aluminum alloy in the form of ingots or billets, extruded and brazed aluminum products made from the aluminum alloy, as well as processes for making extruded and brazed aluminum products. brazed from aluminum alloy.
    [0024] Aluminum alloys and ingots
    [0026] The present disclosure provides an aluminum alloy (which may optionally be in ingot form) capable of limiting corrosion (thread, pitting and/or general corrosion) in an aluminum product comprising it. In one embodiment, the aluminum alloy is capable of limiting pitting corrosion in an aluminum product comprising it, when compared to another aluminum product comprising another aluminum alloy (AA3003 for example). In the context of this disclosure, the term "limit corrosion" refers to the ability to reduce or delay the progress of corrosion in a product made from the aluminum alloy of this disclosure compared to a corresponding product. made from a different aluminum alloy (AA3003 for example).
    [0028] The aluminum alloys of the present disclosure comprise zinc (Zn) as a deliberate addition to reduce or delay the onset of corrosion ( eg, pitting corrosion) in an aluminum alloy comprising it. If Zn is present at less than about 0.10 weight percent, the aluminum product comprising the alloy does not exhibit a substantial reduction in pitting corrosion ( eg, see Alloys B, D, E and G in Example I). On the other hand, if Zn is present in greater than about 0.20 weight percent, the aluminum product comprising the alloy will exhibit increased or earlier onset of general corrosion. As such, the aluminum alloys of the present disclosure comprise at least about 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18 or 0.19 and/or at most about 0.20, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, 0.13, 0.12 or 0.11 of Zn (in percent by weight). In one embodiment, the aluminum alloys of this disclosure comprise at least about 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0, 18 or 0.19 and at most about 0.20, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, 0.13, 0.12 or 0.11 of Zn (in percent by weight). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.10 and about 0.20 Zn (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise at least about 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, or 0.19 y/ or at most about 0.20, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14, or 0.13 of Zn (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise at least about 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, or 0.19 and as much about 0.20, 0.19, 0.18, 0.17, 0.16, 0.15, 0.14 or 0.13 of Zn (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.12 and about 0.16 Zn (in weight percent).
    [0030] In some embodiments, the aluminum alloy of the present disclosure may optionally comprise copper (Cu) which is normally found as an impurity. In the context of the present disclosure, Cu, at low levels, may participate in reducing or delaying the initiation of corrosion ( eg, pitting corrosion) in an aluminum product comprising it. In the aluminum alloy of the present disclosure, Cu may be present at a maximum weight percent of about 0.03. As such, the aluminum alloys of the present disclosure may include up to about 0.03, 0.02, or 0.01 Cu (in weight percent). In one embodiment, the aluminum alloys of the present disclosure may comprise up to about 0.01 Cu (in weight percent).
    [0032] Aluminum products made from the aluminum alloys of the present disclosure exhibit acceptable grain size ( eg, medium or fine). In an aluminum product, grain size can be determined qualitatively ( eg, coarse, medium, or fine) or quantitatively ( eg, by measuring cold-worked post-brazing grain size (CWPB). )). In some embodiments, an extruded and brazed aluminum product having an acceptable grain size will have a CWPB value equal to or less than 150p, 140p, 130p, 120p, 110p or 100p. In yet another embodiment, the extruded and brazed aluminum product has a CWPB value equal to or less than 100p. To adjust the grain size in the resulting aluminum product, a deliberate addition of Fe is made to the aluminum alloy. If Fe is present in the aluminum alloy at below about 0.15 weight percent, the aluminum product comprising the aluminum alloy does not have an acceptable grain size ( eg, see Alloys). F and G in Example I). On the other hand, if Fe is present, in the aluminum alloy, in greater than about 0.30 weight percent, the aluminum product comprising the aluminum alloy will exhibit increased or earlier onset of pitting corrosion ( eg, see alloy B in Examples I and II). As such, the aluminum alloys of the present disclosure comprise at least about 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23 , 0.24, 0.25, 0.26, 0.27, 0.28, 0.29 and/or at most about 0.30, 0.29, 0.28, 0.27, 0.26, 0.25, 0.24, 0.23, 0.22, 0.21, 0.20, 0.19, 0.18, 0.17 or 0.16 Fe (in weight percent). In one embodiment, the aluminum alloys of this disclosure comprise at least about 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0, 23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29 and at most about 0.30, 0.29, 0.28, 0.27, 0.26, 0 0.25, 0.24, 0.23, 0.22, 0.21, 0.20, 0.19, 0.18, 0.17 or 0.16 Fe (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.15 and about 0.30 Fe (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise at least about 0.15, 0.16, 0.17, 0.18, 0.19, or 0.20 Fe (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise at least about 0.20 Fe (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise at most about 0.30, 0.29, 0.28, 0.27, 0.26, 0.25, 0.24, 0.23, 0.22, or 0.21 Fe (in percent in weigh). In a further embodiment, the aluminum alloys of the present disclosure comprise between about 0.20 and about 0.24 Fe. In yet another embodiment, the aluminum alloys of the present disclosure comprise at most about 0.25 Fe (in weight percentage).
    [0034] The aluminum alloys of the present disclosure may optionally include silicon (Si) typically as an impurity. Si reduces the solubility of Mn and can promote the formation of fine dispersoid particles that can inhibit recrystallization during extrusion and brazing and ultimately result in a coarse grain size that is detrimental to formability and strength. corrosion resistance. In the context of the present disclosure, Si is provided with a sufficiently low content to promote adequate grain size in the resulting extruded and brazed aluminum product comprising the aluminum alloy. The aluminum alloys of the present disclosure thus comprise a maximum of ( eg, up to) about 0.15 Si (in weight percent). In one embodiment, the aluminum alloys of this disclosure comprise a maximum of ( eg, up to) about 0.14, 0.13, 0.12, 0.11, 0.10, 0.09, 0 0.08, 0.07, 0.06 or 0.05 Si (in percent by weight). For example, the aluminum alloys of this disclosure can comprise at least about 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0, 13 or 0.14 and/or at most about 0.15, 0.14, 0.13, 0.12, 0.11, 0.10, 0.09, 0.08, 0.07 or 0.06 Yes (in percentage by weight). In a further embodiment, the aluminum alloys of this disclosure may comprise at least about 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13 or 0.14 and at most about 0.15, 0.14, 0.13, 0.12, 0.11, 0.10, 0.09, 0.08, 0.07 or 0.06 Yes (in percentage by weight). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.05 and about 0.15 Si (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise a maximum of ( eg , up to) about 0.14, 0.13, 0.12, 0.11, or 0.10 Si (in weight percent ). In yet another embodiment, the aluminum alloys of the present disclosure comprise a maximum of ( eg, up to) about 0.12 Si (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise a maximum of ( eg, up to) about 0.10 Si (in weight percent).
    [0035] Because aluminum products made from the aluminum alloys are intended to be brazed and used in structural applications, it is necessary that some of the alloying elements in the aluminum alloys of the present disclosure promote properties of adequate tensile strength and also allow brazing of the resulting products ( eg, herein referred to as weldability). Accordingly, the aluminum alloys of the present disclosure comprise both magnesium (Mg) and manganese (Mn) as deliberate additions to the aluminum alloys of the present disclosure to provide adequate tensile properties and weldability. As is known in the art, "tensile properties" refers to the elongation property as well as the "strength" of an aluminum product. "Strength" can be measured as its ultimate tensile strength and/or yield strength. In the context of the present disclosure, the strength of an aluminum product is determined on an aluminum product that has been extruded and brazed or at least simulated brazed (and optionally stretched). In one embodiment, the aluminum alloys of the present disclosure provide, in an extruded and brazed (or brazed-stimulated) aluminum product comprising the same, an ultimate tensile strength (UTS) of at least about 105 MPa or at least about 100 MPa. To achieve such strength, it is important that the aluminum alloy comprises both Mg and Mn. Without wishing to be bound by theory, it is believed that the presence of Mg improves weldability by reacting with the brazing flux and reducing the fluidity of the filler metal so as to reduce defects caused by filler metal build-up due to gravity or capillary action. The presence of elevated levels of Mg ( eg, greater than about 0.10) or Mn ( eg, greater than about 1.2) is believed to increase high temperature creep, increase extrusion pressure and decreases extrudability and can excessively reduce flux activity during brazing such that successful joints cannot be obtained.
    [0037] The aluminum alloys of the present disclosure comprise at least about 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, or 0.09 and/or at most about 0.10.0 0.09, 0.08, 0.07, 0.060.05 or 0.04 Mg (in weight percent). In one embodiment, the aluminum alloys of this disclosure comprise at least about 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, or 0.09 and at most about 0.10 , 0.09, 0.08, 0.07, 0.06, 0.05 or 0.04 Mg (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.03 and about 0.10 Mg (in weight percent). In one embodiment, the aluminum alloys of this disclosure comprise at least about 0.06, 0.07, 0.08 or 0.09 and/or at most about 0.10, 0.09, 0.08 or 0 0.07 Mg (in percent by weight). In one embodiment, the aluminum alloys of this disclosure comprise at least about 0.06, 0.07, 0.08, or 0.09 and at most about 0.10, 0.09, 0.08, or 0.07 of Mg (in percent by weight). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.06 and about 0.10 Mg (in weight percent).
    [0039] The aluminum alloys of the present disclosure comprise at least about 0.9, 1.0, or 1.1 and/or at most about 1.2, 1.1, or 1.0 Mn (in weight percent). In one embodiment, the aluminum alloys of the present disclosure comprise at least about 0.9, 1.0, or 1.1 and at most about 1.2, 1.1 or 1.0 Mn (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.9 and about 1.2 Mn (in weight percent). In one embodiment, the aluminum alloys of the present disclosure comprise at least about 0.9, 1.0, or 1.1 and/or at most about 1.2, 1.1, or 1.0 Mn (in percentage by weight). weight). In one embodiment, the aluminum alloys of the present disclosure comprise at least about 0.9, 1.0, or 1.1 and at most about 1.2, 1.1, or 1.0 Mn (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure comprise between about 0.9 and about 1.1 Mn (in weight percent).
    [0041] In the aluminum alloys of this disclosure, the combined weight percent of both Mg and Mn ( eg, "Mg Mn") is greater than about 0.92, such as, for example, equal to or greater than about 0.99. In some embodiments, the combined weight percent of Mg and Mn is associated with a maximum tensile strength of at least about 100 MPa, and in some additional embodiments, a maximum tensile strength of at least about 105 MPa in products. extruded and brazed aluminum alloys of such aluminum alloys. For example, the combined weight percent of Mg and Mn can be at least about 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.00, 1.01, 1.02 or 1.03. In yet another embodiment, the combined weight percent of Mg and Mn can be equal to or greater than about 1.0. In one embodiment, the combined weight percent of Mg and Mn can be at least about 1.03.
    [0043] The aluminum alloys of the present disclosure may optionally include titanium (Ti) as a deliberate addition. In the context of the present disclosure, Ti can act as a grain refiner. In one embodiment, the aluminum alloys of the present disclosure may comprise at most 0.04, 0.03, 0.02, or 0.01 Ti (in weight percent). In yet another embodiment the aluminum alloys of the present disclosure may comprise a maximum of 0.04 Ti (in weight percent). In yet another embodiment, the aluminum alloys of the present disclosure may comprise a maximum of 0.03 Ti (in weight percent). In some embodiments, Ti may be used in combination with boron (B) when using a grain refiner. For example, Al-5 wt% Ti-1 wt% B is a commonly used grain-refining material added to aluminum and can be used as a grain-refining material in the aluminum alloys of the present disclosure.
    [0045] The balance of the aluminum alloys of the present disclosure is aluminum and unavoidable impurities. Such impurity includes, but is not limited to nickel (Ni). In one embodiment, each impurity is present, on a weight percent basis, at a maximum of about 0.05 and the total unavoidable impurities are present, on a weight percent basis, at a maximum of less than about 0.15. In another embodiment, when Ni is present as an impurity, its weight percent in the aluminum alloy is equal to or less than 0.01.
    [0047] The present disclosure also provides extrusion ingots comprising the aluminum alloys described herein. Preferably, the ingots are intended for use in an extrusion process to manufacture extruded and brazed aluminum products.
    [0049] Aluminum products and process to obtain them
    [0051] The present disclosure further provides an aluminum product comprising the aluminum alloy described herein. The aluminum product has improved corrosion resistance, especially pitting corrosion, than another aluminum product made from an aluminum alloy having less than about 0.10 or more than about 0.20 Zn. The aluminum product also has an acceptable grain size for downstream applications. The aluminum product also exhibits improved tensile property, especially increased ultimate tensile strength and adequate weldability when compared to another aluminum product made from an aluminum alloy having less than about 0.9 or more than about 1 0.2 Mn, having less than about 0.03 or more than about 0.10 Mg or having a combined content of Mg and Mn equal to or less than about 0.99. The aluminum product also exhibits higher extrudability when compared to other aluminum product made from an aluminum alloy having greater than about 1.2 Mn and/or 0.10 Mg.
    [0053] The aluminum product is an extruded and brazed aluminum product that can optionally be drawn. The aluminum products of the present disclosure have a minimum ultimate tensile strength, measured after extrusion and brazing, of at least about 105 MPa. The aluminum product may be a tube, such as a heat exchanger tube. In some embodiments, the aluminum product may be used in heavy gauge applications, such as as headers or connector tubes. As noted above, in some embodiments, the extruded and brazed aluminum products of the present disclosure may have a grain size (measured as CWPB) equal to or less than about 150p (eg , 100p per grain). example) and/or maximum tensile strength of at least 100 MPa ( eg, 105 MPa, for example).
    [0055] The present disclosure also provides a process for making the aluminum products described herein. First, the aluminum alloy described herein (which may be provided as an extrusion ingot) is homogenized to provide a homogenized aluminum alloy. For To provide a homogenized aluminum alloy, the aluminum alloy is first heated (for example, at a temperature between 580°C and 620°C for a period of at least 1 hour (h), 2h, 3h, 4h, 5 h, 6 h, 7 h, 8 h or more) and then cooled (eg at a rate of 400 °C/h or less). In one embodiment, the aluminum alloy is first heated to a temperature between about 560°C and 600°C for a period of 2h to 6h and then cooled at a rate equal to or less than 400°C/h. Second, once the homogenized aluminum alloy is provided, it is extruded to provide an extrudate. Before being brazed, the aluminum product may optionally be worked (eg, rolled or drawn) into a worked aluminum product (eg, a rolled aluminum product or a drawn aluminum product). Once the extruded aluminum product or wrought aluminum product has been made, it is subjected to a brazing step to provide a welded extruded aluminum product. Optionally, the process may include providing the aluminum alloy described herein prior to homogenization.
    [0057] The present invention will be more readily understood by reference to the following examples which are provided to illustrate the invention and not to limit its scope.
    [0059] EXAMPLE I - MODULATION IN CORROSION RESISTANCE AND GRAIN SIZE
    [0061] The example was designed to develop an aluminum alloy for undrawn applications as well as to determine its applicability for heavy gauge cold drawn and brazed products.
    [0062] The alloy compositions listed in Table 1 were direct cold cast (DC) as 101mm diameter billets. These were cut into billets and homogenized in one of two homogenization practices: (i) 4 hours/620°C followed by cooling to 300°C/hour; or (ii) 4 hours/580°C followed by cooling at 300°C/hour. These billets were extruded into a 3 x 42mm strip using a billet temperature of 480°C and a ram speed of 18mm/s. The strip was then cold rolled to a thickness of 1.2 mm, corresponding to a cold reduction of 60%. The material was given a simulated brazing cycle of 2.5 min/600 °C. A flat face die was used for extrusion to avoid contamination between alloy variants, which could otherwise influence subsequent property testing. After brazing, longitudinal grain size was measured along with tensile properties and corrosion potential (ASTM G69). Coupons produced from billets homogenized at 580°C were also exposed in the SWAAT test (ASTM G85A3) for 20 days, and mean hole depths for the six deepest holes per coupon were measured according to ASTM G46. Control Alloy B was homogenized at 620 °C for corrosion testing, as this is typical commercial practice for this alloy. Grain sizes were measured by the linear intercept method and refer to grain length in the extrusion or drawing direction (eg, grain size after cold-worked brazing or CWPB). Electrochemical corrosion potential (known as Ecorr) was measured in accordance with ASTM G69. The results are summarized in Table 1.
    [0063] Table 1. Elemental composition and characteristics of the different alloys tested in this Example. CWPB: grain size after brazing and cold working; UTS: maximum tensile strength.
    [0065]
    [0067] 1 This alloy corresponds to AA3003, is a standard commercial alloy currently used for heavy gauge heat exchanger tube applications and represents the control in this example. *: Examples useful for understanding the invention.
    [0068] As shown in Table 1, Alloy B had the deepest pitting and all other alloys tested gave some improvement in comparison. Alloy E provided the most modest improvement in pitting corrosion resistance. Furthermore, although alloy F, with deliberate additions of Zn and Ti, gave the best corrosion resistance, it gave a grain size after brazing greater than 150 p, which is not acceptable. Alloy G also provided a target grain size after brazing of more than 150p. Alloys A, C, D and E also do not provide an aluminum alloy having a maximum tensile strength greater than 100 MPa.
    [0069] Alloy D exhibited inadequate strength ( i.e., below 105 MPa) and, although smaller than the 150 p target grain size, exhibited a significantly coarser grain than Alloy B. The addition of Fe in alloy E (compared to alloy D) it improved grain size, but was also detrimental to corrosion resistance.
    [0070] Alloy C met the required grain size, but did not provide sufficient improvement in corrosion resistance or adequate strength.
    [0071] EXAMPLE II - OPTIMIZATION IN RESISTANCE TO CORROSION AND GRAIN SIZE
    [0072] The objective of this example was to identify an alloy composition with superior corrosion resistance to AA3003 without significant loss in strength or post-brazing formability (which is primarily controlled by post-brazing grain size).
    [0073] The alloys in Table 2 were cast with DC as 101 mm diameter extrusion ingots. The same test protocols were followed, as in Example I, with the exception that corrosion tests were performed for low and high temperature homogenization cycles. The results of the trial are summarized in Table 2.
    [0074] Table 2. Elemental composition and characteristics of the different alloys tested in this Example. CWPB: grain size after brazing and cold working; UTS: maximum tensile strength.
    [0076]
    [0078] 1 This alloy corresponds to AA3003, is a standard commercial alloy currently used for heavy gauge heat exchanger tube applications and represents the control in this example. *: Examples useful for understanding the invention.
    [0079] Alloy H was not able to meet the 105 MPa strength target. Alloy J gave coarse grain in the extruded condition, when homogenized at low temperature, which could limit its drawability. Alloy K gave limiting strength when homogenized at 580°C.
    [0080] The remaining alloys I, J, L, and M met the strength and corrosion resistance targets, but alloy M gave inferior corrosion resistance when homogenized at 620 °C. Alloy I provided the best overall performance.
    [0081] Alloys B, I and M were DC cast as 101mm diameter ingots. The same protocols were followed As in Example I, except that cold reductions of 20, 40 and 60% were applied prior to brazing. The test results are summarized in Table 3.
    [0083] Table 3. Grain size (p) after brazing and cold working for alloys I, B and M homogenized at different temperatures.
    [0085]
    [0088] Standard AA3003 was the only alloy that met the <100 grain size requirement when only 20% cold reduction was applied. For more typical cold reductions of 40-60%, Alloy L (0.09% Mg) achieved the target grain size for long and short homogenization times at 580 °C. However, Alloy I (0.03% Mg) gave a much larger grain size than the target.
    [0090] Although the invention has been described in relation to its specific embodiments, it will be understood that the scope of the claims should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the entire description.
    权利要求:
    Claims (17)
    [1]
    1. An aluminum alloy for making an extruded and brazed aluminum product, the aluminum alloy comprising, in percent by weight:
    up to 0.15 Si;
    between 0.15 and 0.30 Fe;
    between 0.9 and 1.2 Mn;
    between 0.03 and 0.10 Mg;
    between 0.10 and 0.20 Zn;
    up to 0.03Cu;
    up to 0.04Ti; Y
    the rest is aluminum and unavoidable impurities.
    where (MgMn) is equal to or greater than 0.99.
    [2]
    2. The aluminum alloy of claim 1, comprising up to 0.12 Si.
    [3]
    3. The aluminum alloy of claim 1 or 2, comprising at least 0.20 Fe.
    [4]
    4. The aluminum alloy of any one of claims 1 to 3, comprising 0.9 and 1.1 Mn.
    [5]
    5. The aluminum alloy of any one of claims 1 to 4, comprising between 0.06 and 0.10 Mg.
    [6]
    6. The aluminum alloy of any one of claims 1 to 5, comprising between 0.12 to 0.16 Zn.
    [7]
    7. The aluminum alloy of any one of claims 1 to 6, comprising up to 0.01 Cu.
    [8]
    8. The aluminum alloy of any one of claims 1 to 7, comprising up to 0.03 Ti.
    [9]
    9. The aluminum alloy of any one of claims 1 to 8, wherein (Mg Mn) is equal to or greater than 1.0.
    [10]
    An extrusion ingot comprising the aluminum alloy of any one of claims 1 to 9 for making an extruded and brazed aluminum product.
    [11]
    11. An extruded and brazed aluminum product comprising the aluminum alloy of any one of claims 1 to 9.
    [12]
    12. A process for manufacturing an extruded and brazed aluminum product, the process comprising:
    (a) homogenizing the aluminum alloy of any one of claims 1 to 9 into a homogenized aluminum alloy;
    (b) extruding the homogenized aluminum alloy into an extruded aluminum product;
    (c) optionally converting the extruded aluminum product to a worked aluminum product; and (d) brazing the extruded aluminum product or the worked aluminum product into the extruded and brazed aluminum product.
    [13]
    13. The process of claim 12, further comprising providing the aluminum alloy of step (a) as an extrusion ingot.
    [14]
    14. The process of claim 12 or 13, further comprising performing the homogenization of step (a) at a temperature between 580 °C and 620 °C.
    [15]
    15. The process of claim 14, wherein step (b) further comprises a cooling step at 400 °C/h or less.
    [16]
    16. The process of any one of claims 12 to 15, wherein step (d) further comprises drawing the extruded aluminum product and the worked aluminum product is a drawn aluminum product.
    [17]
    17. An extruded and brazed aluminum product made by the process of any one of claims 12 to 16.
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    同族专利:
    公开号 | 公开日
    MX2018013096A|2019-03-28|
    EP3449026A4|2019-12-18|
    CA3022456A1|2017-11-02|
    ES2870139T3|2021-10-26|
    US20190127823A1|2019-05-02|
    PT3449026T|2021-01-20|
    CA3022456C|2020-01-07|
    EP3449026A1|2019-03-06|
    WO2017185173A1|2017-11-02|
    EP3449026B9|2021-11-03|
    DK3449026T3|2021-01-11|
    US11255002B2|2022-02-22|
    EP3449026B1|2020-10-28|
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    法律状态:
    优先权:
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    US201662329272P| true| 2016-04-29|2016-04-29|
    PCT/CA2017/050435|WO2017185173A1|2016-04-29|2017-04-10|Corrosion resistant alloy for extruded and brazed products|
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