KR20160115662A - Corrosion resistant aluminium alloy, manufacturing method for tube or pipe using the aluminium alloy, and heat exchanger using the same - Google Patents

Corrosion resistant aluminium alloy, manufacturing method for tube or pipe using the aluminium alloy, and heat exchanger using the same Download PDF

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KR20160115662A
KR20160115662A KR1020150144696A KR20150144696A KR20160115662A KR 20160115662 A KR20160115662 A KR 20160115662A KR 1020150144696 A KR1020150144696 A KR 1020150144696A KR 20150144696 A KR20150144696 A KR 20150144696A KR 20160115662 A KR20160115662 A KR 20160115662A
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weight
alloy
tube
pipe
present
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KR101811332B1 (en
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손희식
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주식회사 에프티넷
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • 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
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Abstract

The present invention relates to an aluminum alloy for a heat exchanger tube or a pipe with improved corrosion resistance, and a manufacturing method thereof. The aluminum alloy is based on aluminum, comprising: 0.50 wt% or less of Cu; and 0.005-1.0 wt% of element X [at least one rare earth metals which belongs to atomic number 57 (La) to atomic number 71 (Lu), Sc, Nb, and Hf] and includes [0.01-2.0 wt% of Mn, (Si+Mg) < 0.65 wt%, and Zn < 4.0 wt%] or [Si >= 0.03 wt%, (Mn+Mg+Zn) < 1.0 wt%, and Al >= 98.97 wt%] or [0.25-1.4 wt% of Si, 0.4-1.3 wt% of Mg, Mn <= 1.0 wt%, and Zn <= 0.25 wt%]. In addition, the aluminum alloy may further comprise at least one element selected from Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb, and Y; and other inevitable impurities. In a case of manufacturing the tube or the pipe for a heat exchanger using the aluminium alloy, corrosion resistance and strength may be improved.

Description

[0001] The present invention relates to an aluminum alloy having improved corrosion resistance, an aluminum tube or pipe using the alloy, and a heat exchanger system using the aluminum alloy,

More particularly, the present invention relates to an aluminum alloy having improved corrosion resistance by adding a special element such as a rare earth element (X element) to an aluminum alloy and a method for producing the alloy. Particularly, the present invention relates to aluminum alloys for processing aluminum 1XXX, 3XXX And improved aluminum alloys for the 6XXX series.

For heat exchangers such as evaporators, condensers, and piping, aluminum or aluminum alloy materials, which are generally lightweight and have good thermal conductivity, are used. These heat exchangers consist of a condenser tube and fin of aluminum alloy extruded material, a head pipe, and various pipes. These heat exchangers are generally constructed by assembling a tube and a pin (generally a plate material for brazing to the pin core material is covered or clad) with a predetermined structure, and then brazing in a heating furnace in an inert gas atmosphere. Is completed.

       Tube or pipe material widely used is Al 1XXX series and Al 3XXX series materials, and Al 6XXX series materials are also used partially when more strength is required. Al 4XXX series is also widely used as a clad material for brazing tubes or pipes to pins and head pipes.

Since the extruded tube or pipe of the heat exchanger is used as the refrigerant passage tube, if the penetration due to corrosion occurs during use, the refrigerant leaks and the function as the heat exchanger can not be achieved. For this reason, conventionally, Zn (zinc) is attached to the surface of the extruded tube by spraying or the like in advance, and Zn is diffused by brazing (soldering). As a result, the Zn diffusion layer formed on the surface layer of the tube acts as a sacrificial anode against the deep portion, thereby suppressing corrosion in the plate thickness direction, thereby prolonging the corrosion penetration life. In this case, Zn is required to be attached to the tube after the Zn coating (spraying, etc.) is extruded, resulting in an increase in manufacturing cost.

In particular, in view of the corrosion resistance of the tube, Japanese Patent Laid-Open No. 11-21649 discloses a steel sheet comprising 0.15 to 0.35 wt% of iron, 0.15 wt% or less of silicon, less than 0.03 wt% of zinc, 0.55 wt% of copper, % Of titanium, and 0.003 to 0.010 wt% of titanium, iron / silicon ≥2.5, and the remainder being aluminum and inevitably added.

However, since copper is added as an additive element in order to secure the corrosion resistance of the alloy, a large amount of copper (0.55% by weight) is added to form a large number of Al-Cu intermetallic compounds, There is a problem that the corrosion potential is lowered in the local region of the base material (material) due to precipitation of the intermetallic compound, and the corrosion resistance characteristics are deteriorated.

In order to improve this, Korean Patent Laid-Open No. 10-2011-0072237 proposes a method in which Zr and B are added to an aluminum alloy containing 0.15 to 0.45% of copper to omit the Zn spraying process outside the tube . This document contains a technical idea that the crystal of the aluminum alloy becomes finer due to the effect of addition of Zr and B, thereby increasing the corrosion resistance. However, when the content of copper is 0.1 wt% or more, copper precipitates at the grain boundaries during operation of the heat exchanger, resulting in increased susceptibility to intergranular corrosion, resulting in generation of grain boundaries and shortening of the corrosion life of the tube .

       In the above documents, Cu was added as a main element to improve the corrosion resistance, but the disadvantages of Cu addition were not sufficiently overcome.

In order to increase the corrosion resistance, copper (Cu) is minimized to 0.01% or less, and 0.50 to 1.0% by weight of manganese (Mn) and 0.2% by weight or less of copper Although 0.05 to 0.15 wt% of zirconium (Zr) is added to the composition of silicon (Si), the advantage of increasing the corrosion potential of Cu due to the removal of Cu is sacrificed. It is difficult to adopt it in a heat exchanger system.

On the other hand, since the Rare Earth metals of La (atom) No. 57 (La) to La (Ru) 71 are currently under extensive research and development due to their beneficial properties, development activities are mainly in the fields of corrosion resistance and strength increase of magnesium (alloy) And increasing corrosion resistance by conversion coating on aluminum alloy surface. (J. Alloys Compd, 2012, 538 (0):... 21., Mater Des, 2009, 30 (7): 2372., Mater Des, 2010, 31 (Supplement 1):... S24, Mater. Sci. Eng., A , 2012, 532: 606., J. Rare Earths , 2011, 29 (10): 961.)

     A very limited literature has studied the effect of adding up to 0.45% of Ce on Al ?? Cu ?? Mg ?? Ag alloys, where the addition of Ce forms finer and more dense precipitates, In the United States. (J. Alloys Comp. 352 (2003) 84.). In addition, the addition of 0.2% Ce in Al-2519 and T87 alloys of Al 2XXX series increases the room temperature strength of the alloy by promoting the precipitation of dense and fine phases, and the addition of 0.4% Ce enhances the thermal stability at 300 ° C There is a bar. (Journal of Alloys and Compounds 491 (2010) 366-371)

Most of the above documents on the addition of rare earth metals have been developed to increase the strength of the alloy and to develop the surface coating. Up to now, 1XXX, 3XXX and 6XXX series which are widely used for tubes or pipes in aluminum alloys for processing and 4XXX series for brazing In order to improve the properties such as corrosion resistance, it is difficult to find a related literature in which rare earth elements and the like are directly added to an alloy.

       However, in very limited literature, you can find records for the Al 1XXX series and the Al 4XXX series. Korean Patent No. 10-1335680 and Korean Patent No. 10-1349359 have modified the Al 1 XXX series and added Sc, Y and MM (misch metal) up to 0.6% in order to increase the strength. However, Si The production of alloy is difficult and the production cost is increased. In addition, in the Korean Patent No. 10-1194970, Ce, La, and MM were added up to 0.5% in the aluminum 4XXX series for brazing, but as a result of approaching from the viewpoint of bonding property of brazing, There is a problem in that the addition amount of metal and the like is not optimized and thus it does not greatly contribute to improvement in corrosion resistance.

Therefore, in the present invention, rare earth elements and the like are added to the aluminum alloys of 1XXX, 3XXX, 4XXX and 6XXX for processing, thereby increasing the corrosion resistance and strength of the aluminum alloy and overcoming the disadvantage of adding Cu.

Japanese Patent Application Laid-Open No. 11-21649 Korean Patent Publication No. 10-2011-0072237 Korean Patent Publication No. 10-2014-0000406 Korean Patent No. 10-1335680 Korean Patent No. 10-1349359 Korean Patent No. 10-1194970

J. Alloys Compd., 2012, 538 (0): 21 Mater. Des., 2009, 30 (7): 2372 Mater. Des., 2010, 31 (Supplement 1): S24 Mater. Sci. Eng., A, 2012, 532: 606 J. Rare Earths, 2011, 29 (10): 961        J. Alloys Compd. 352 (2003) 84        J. Alloys Compd. 491 (2010) 366

It is an object of the present invention to solve the above-described problem in relation to an aluminum coolant tube or piping of a heat exchanger. It is an object of the present invention to provide an aluminum alloy composition for a tube or pipe which maintains the life of a heat exchanger, a refrigerant tube or a pipe even in a harsh environment with an excellent strength and extrudability and an improved corrosion resistance, .

SUMMARY OF THE INVENTION [0006]

0.005 to 1.00% by weight of X element and 0.50% by weight or less of copper (Cu);

Mn of 0.01 to 2.0% by weight, Si + Mg < 0.65 and Zn <4.0;

Wherein the X element is at least one of rare earth metals, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu) .

It is an object of the present invention,

0.005 to 1.00% by weight of X element and 0.50% by weight or less of copper (Cu);

Si? 0.03, (Mn + Mg + Zn) < 1.0 and Al? 98.97 as weight%

Wherein the X element is at least one of rare earth metals, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu) .

It is an object of the present invention,

0.005 to 1.00% by weight of X element and 0.50% by weight or less of copper (Cu);

0.25 ~ 1.4 Si, 0.4 ~ 1.3 Mg, Mn &lt; = 1.0, Zn &lt; = 0.25,

The X element may be at least one of rare earth metals, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu) .

According to an aspect of the present invention,

The X element may be in the range of 0.01 to 0.60 wt% or 0.05 to 0.50 wt%.

According to another aspect of the present invention,

Cu may be in the range of 0.002 to 0.45 wt% or 0.02 to 0.45 wt%.

Another object of the present invention is to provide:

0.51 to 5.0% by weight of X element and 0.50% by weight or less of copper (Cu);

Si 4.0 to 17.0, Mn? 0.5, Mg? 2.0, and Zn? 2.0 as weight%

Wherein the X element is one or more of rare earth metals of atomic number 57 (La) to 71 (Lu), scandium (Sc), niobium (Nb), or hafnium (Hf) &Lt; / RTI &gt;

According to still another aspect of the present invention,

The aluminum alloy may further include at least one selected from Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y.

Another object of the present invention is to provide:

The content of X element which is at least one selected from rare earth metals, scandium (Sc), niobium (Nb) or hafnium (Hf) in atomic numbers 57 (La) to 71 (Lu) is 0.005 to 1.0% 0.50 wt% or less;

[Mn: 0.01 to 2.0, (Si + Mg) < 0.65 and Zn < 4.0]

[Si? 0.03, (Mn + Mg + Zn) < 1.0 and Al? 98.97% by weight] or

[Si 0.25 to 1.4, Mg 0.4 to 1.3, Mn? 1.0 and Zn? 0.25 in weight%;

In a temperature range of 670 to 950 占 폚;

Casting the molten metal to produce a base material in the form of a billet or a wire rod;

Subjecting the base material to heat treatment at a temperature of 450 to 650 ° C for 5 to 25 hours;

Extruding or drawing the base material;

The present invention also provides a method of manufacturing an aluminum tube or pipe.

According to an aspect of the present invention, the X element may be in the range of 0.01 to 0.60 wt% or 0.05 to 0.50 wt%.

According to another aspect of the present invention,

Cu may be in the range of 0.002 to 0.45 wt% or 0.02 to 0.45 wt%.

According to still another aspect of the present invention,

The base material may further include at least one selected from Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y.

According to still another aspect of the present invention,

The method for producing the above-mentioned alloyed molten metal is characterized in that the X metal of the individual element, the X parent alloy of two or more elements (the parent alloy of the X element when the X element is two or more) or the parent alloy of Al- And a parent alloy of an alloy of X elements).

According to still another aspect of the present invention,

The X-parent alloy or the parent alloy of Al-X of at least two elements may be at least one selected from Cu, Mn, Si, Mg, Zn, Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, , Ag, Pd, Sb, and Y, and may be in the form of a multi-element parent alloy having a ternary system or more.

According to still another aspect of the present invention,

The manufacturing method may further include any one of aging hardening heat treatment, zinc coating, chemical coating, resin coating, and combinations thereof.

A further object of the present invention is to provide

The content of X element which is at least one selected from rare earth metals, scandium (Sc), niobium (Nb) or hafnium (Hf) in atomic numbers 57 (La) to 71 (Lu) is 0.005 to 1.0% 0.50 wt% or less;

[Mn: 0.01 to 2.0, (Si + Mg) < 0.65 and Zn < 4.0]

[Si? 0.03, (Mn + Mg + Zn) < 1.0 and Al? 98.97% by weight] or

[Si 0.25 to 1.4, Mg 0.4 to 1.3, Mn? 1.0 and Zn? 0.25 in weight%;

Is connected to a fin, a header or both having a lower corrosion potential than the tube or pipe. &Lt; RTI ID = 0.0 &gt; [0002] &lt; / RTI &gt;

The heat exchanger system is characterized in that the content of X element which is at least one selected from a rare earth metal, scandium (Sc), niobium (Nb) or hafnium (Hf) of atomic number 57 (La) % By weight, Cu content is 0.50% by weight or less;

Si 4.0 to 17.0 in weight%, Mn? 0.5, Mg? 2.0, Zn? 2.0;

May be used as the brazing alloy to bond to the fin, the header, or both.

The tube or pipe and the brazing alloy may further contain at least one selected from Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y .

According to still another aspect of the present invention,

Any one of the tubes, pipes, fins, headers, and combinations thereof may be further subjected to an age hardening heat treatment, a zinc coating, a chemical coating, a resin coating, or a combination thereof.

According to the present invention, the corrosion resistance and the strength can be improved by improving the composition of the aluminum alloy used for the heat exchanger tube or piping by adding a special element (referred to as "X element" in the present invention) for improving corrosion resistance. As a result, it is possible to simplify the manufacturing process and reduce the cost by increasing the lifetime of the parts, omitting the zinc coating process and omitting the additional post-treatment process.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a conceptual diagram for explaining improvement of corrosion resistance according to the present invention. Fig.
2 is another conceptual diagram illustrating the principle of improving corrosion resistance according to the present invention.
3 is a photograph of an aluminum alloy tube produced by the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an aluminum alloy composition and a manufacturing process thereof according to the present invention will be described with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

The corrosion-resistant aluminum alloy (hereinafter referred to as &quot; aluminum alloy &quot;) according to the present invention essentially contains an X element based on aluminum. The term "X element" used in the present invention refers to at least one element selected from the group consisting of rare earth metals (Sc), niobium (Nb), and hafnium (Hf) Is defined as an element consisting of

According to the present invention, in the case of an aluminum alloy for a tube or a pipe, X element is contained in the range of 0.005 to 1.0 wt% with respect to the total weight of the aluminum alloy, and Cu is contained in the range of 0.50 wt% or less. The aluminum alloy composition for tubes or pipes in the present invention can be classified into three types.

First, in addition to the X element and Cu, the content of Mn is 0.01 to 2.0, (Si + Mg) < 0.65 and Zn < 4.0 in weight%. In this case, the modified Al 3 XXX series alloy to which the X element according to the present invention is added is added to a commercial Al 3 X X X series alloy.

"Note: Relating to the content of a particular element (A) throughout this specification and claims, the expression A <4.0 means that the element A is in the range 0 <A <4.0."

Secondly, in addition to the X element and Cu, Si? 0.03, (Mn + Mg + Zn)? 1.0 and Al? 98.97 in weight% In this case, the alloy of improved A1XXX series to which the element X according to the present invention is added to the commercial Al 1XXX series is obtained.

Thirdly, in addition to the X element and the Cu, the content of Si is 0.25 to 1.4, Mg 0.4 to 1.3, Mn? 1.0, and Zn? 0.25 in weight%. In this case, the modified Al 6 X X X series alloy to which the X element according to the present invention is added is added to a commercial Al 6 X X X series alloy.

According to the present invention, in the case of the aluminum alloy for brazing, the content of X element is increased in the range of 0.51 to 5.0 wt% with respect to the total weight of the aluminum alloy, and the content of Cu is also 0.50 wt% And the content of Mn, Si, Mg and Zn is 4.0 to 17.0 in terms of weight%, Mn? 0.5, Mg? 2.0 and Zn? 2.0. In this case, the modified Al 4XXX series alloy to which the X element according to the present invention is added is added to a commercial Al 4XXX series alloy.

In all the above cases, it is preferable to further include an alloy element (Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb, Y) .

As a result, the aluminum alloy composition according to the present invention excludes the 2XXX series of Al-Cu or Al-Cu-Mg alloy, the 5XXXX series of Al-Mg alloy series and the 7XXX series of Al-Zn-Mg- Except for the X element according to the present invention, except for the X element according to the present invention, a pure aluminum alloy series 1XXX series, an Al-Mn alloy series 3XXX series, an Al-Si alloy 4XXX series, and an Al-Mg-Si alloy series 6XXX series Therefore, the aluminum alloy composition according to the present invention corresponds to the composition of the improved aluminum alloy to which the X element is added to the alloy of the above series.

The effects of Cu, Mn, Mg, Si, and Zn, which are the main alloying elements, on the characteristics of alloys in aluminum alloys are as follows.

Alloy element Cu is added to the matrix to increase the strength of the aluminum alloy, but it has a disadvantage in that the extrudability is greatly lowered compared with Mn. In general, it is known that the addition of Zn decreases the corrosion potential and the addition of Cu increases the corrosion potential. When Zn and Cu coexist, especially when the Zn content is small, the potential increasing effect by Cu is dominant. That is, when the Cu content is large, the effect of increasing the potential by Cu is dominant rather than the potential lowering effect by the Zn diffusion layer. When the content is less than 0.12 wt%, the effect of adding copper such as corrosion resistance is hardly exhibited. , The extrusion resistance and the corrosion resistance are lowered at the same time. In the present invention, the preferable content of Cu is 0.50% by weight or less, more preferably 0.002 to 0.45% by weight or 0.02 to 0.45% by weight. In the present invention, the preferable content of Zn is 4.0 wt% or less.

The alloying element Mn increases the strength of the aluminum alloy. If the Mn content is less than 0.5% by weight, the effect of increasing the strength is small. If the Mn content exceeds 1.7% by weight, the extrudability is deteriorated. The addition of Mn significantly reduces the extrudability, particularly the lower limit extrusion rate, as compared with the case where Si, Cu or Mg is added in the same amount. It also has the effect of precipitating into a fine intermetallic compound of Al 6 Mn to increase the corrosion potential of the alloy. This makes it possible to increase the potential difference with the fin when the corrosion potential of the heat exchanger tube is increased when the tube is made of a heat exchanger tube, thereby improving the corrosion resistance. When the content is less than 0.6% by weight, the effect of adding manganese, such as corrosion resistance, is small. When the content exceeds 1.2% by weight, the extrudability is decreased. The preferred content of Mn in the present invention is 2.0% by weight or less of aluminum.

The alloy element Si precipitates as an Al-Mn-Si intermetallic compound to inhibit crystal grain growth through interfering with grain boundary movement and reduce the deformation resistance upon extrusion, thereby improving the extrudability. When the amount is less than 0.05% by weight, the production cost during casting increases. When the amount of Si is 0.10% or more, the Al-Mn-Si based intermetallic compound is formed in the alloy. This may result in a drop in corrosion potential. On the other hand, when the content exceeds 0.2% by weight, the strength of the alloy is increased and the extrudability is lowered. In the present invention, the preferable content of Si is 0.65 wt% or less when the composition of the aluminum alloy is 3XXX series, and 0.25-1.40 wt% when the composition of the aluminum alloy is 6XXX series.

Alloy element Mg increases strength by influence of hardening of hardening in matrix, but decreases the extrudability as the amount increases. When the addition amount exceeds 2.0%, a compound having a high melting point is formed due to the reaction with the flux and the like, so that the bonding property tends to remarkably decrease. On the other hand, if it exceeds 3.5% by weight, Mg 2 Al 3 precipitates and becomes susceptible to grain boundary corrosion and stress corrosion. Therefore, the preferred Mg content in the present invention is 0.65 wt% or less when the compositional basis of the aluminum alloy is 3XXX series, and 0.40 to 1.30 wt% or less when the compositional basis of the aluminum alloy is 6XXX series.

On the other hand, in the case of metal, an oxide film is formed on the surface to protect the inside from corrosion. However, such an oxide film peels or breaks and gradually corrodes the material.

       Precipitates tend to form in the grain boundaries when the Cu content exceeds the proper amount in the aluminum alloy, thereby increasing the susceptibility to intergranular corrosion and local corrosion. This is because the potential of the Cu precipitate is high and the content of Cu is inversely lowered around the periphery, thereby forming a local corrosion micro-cell.

      Therefore, in order to solve such a problem, in the present invention, it is possible to improve the ductility and adhesiveness of the oxide film by adding X metal in addition to the aluminum alloy, suppress the local corrosion effect due to Cu, and improve the corrosion resistance. In addition, since the X metal has an effect of raising the corrosion potential, it is also possible to minimize Cu addition for the purpose of raising the corrosion potential or to replace Cu.

At this time, when X element is added, the following effect is exhibited.

The X element changes the microstructure of the oxide film to increase the ductility of the oxidation scale to prevent the film from escaping and form a wedge shape toward the inside of the oxide film to increase the adhesion between the base and the oxide film The adhesion between the crystal grains 7 and the protective oxide film 3 is improved). In addition, the formation of vacancies (collapsing) suppresses formation of pores and improves the chemical bonding between the oxide film and the matrix. That is, the formation of pores, which may be formed between the oxide film and the base, is suppressed to prevent a space between the oxide film and the base and a wedge-shaped oxide film to the base to increase the adhesion of the oxide film.

In addition, the element X acts to mitigate the local corrosion caused by Cu because it has the effect of reducing the local corrosion cathodic reaction of the copper precipitate deposited in the matrix and consequently reducing the local corrosion anodic reaction. In addition, the X element reduces the elements such as Fe and Ni, which are weak corrosion-resistant elements in the molten metal, when manufacturing aluminum, thereby enhancing the corrosion resistance.

In the present invention, excellent corrosion resistance can be obtained by adding the X element in order to prevent the aluminum alloy from becoming vulnerable to local corrosion and intergranular corrosion. In this case, the appropriate amount of the X element is preferably in the range of 0.005 to 1.0 wt%, more preferably 0.01 to 0.60 wt% or 0.05 to 0.50 wt%. However, when the base of the aluminum alloy composition is the 4XXX series for brazing, the range of 0.51 to 5.0 wt% is preferable.

That is, as shown in FIG. 1, when the content of Cu in the aluminum alloy is high, particularly 0.10% by weight or more, precipitation of Cu in the grain boundary becomes severe and sensitivity to corrosion becomes high. This is because when Cu precipitates at grain boundaries, the solid solubility (Cu content in the matrix) of Cu in the surrounding matrix is lowered, resulting in a less effect of increasing the corrosion potential of Cu. Therefore, the Cu content in the matrix around the grain boundary becomes lower than the Cu content in the matrix at other sites, resulting in intensive corrosion around grain boundaries and accelerated intergranular corrosion or local corrosion.

Therefore, when a small amount of the element X is added in the present invention, it is possible to minimize adverse effects of local corrosion due to Cu and to improve the ductility and adhesion of the oxide film formed at the grain boundary, thereby minimizing adverse effects when the content of Cu is increased. And improves the corrosion resistance by extending the lifetime of the oxide film on the surface of the alloy other than the grain boundary. That is, as shown in FIG. 1, an excellent oxide film is formed at the corrosion sites at the grain boundaries to inhibit the progress of corrosion. In addition, the addition of X element additionally increases the strength and corrosion potential of the aluminum alloy, so it can be used as a substitute for Cu. It improves the plasticity of the metal by increasing the fluidity of the aluminum alloy and improves the brazing characteristic There is also.

In order to maximize the corrosion resistance of the tubes or piping of the heat exchanger, it is necessary to optimize the corrosion resistance of the neighboring parts connected to the tubes or pipes. For this purpose, a fin core and a header, It is preferable that the corrosion potential of the ash is lower than the corrosion potential of the tube or the pipe. This may be accomplished through selection of a suitable alloying material for the pin shim member and the header material, and may also be achieved through control of the alloy element content, such as Cu, Mn, and Zn.

On the other hand, when the heat exchanger tube or piping is coupled to the system, the tube or piping is brazed to the pin shim member or header material by a cladding material using a brazing process. Since the clad material contains Si in a large amount of 4% or more, Si diffuses on the surface of the pinched part, the header and the tube. At this time, Si bonds with Mn present in the matrix to form an Al-Mn-Si intermetallic compound, thereby lowering the solubility of Mn in the alloy, which may lower the corrosion potential. That is, the corrosion resistance of the surface can be deteriorated.

Therefore, when the X element according to the present invention is added to the clad material, the X element is diffused and permeated into the tube or pipe and the core deep portion or the header surface. Therefore, the corrosion potential of the surface of these materials rises and compensates for the influence of Si diffusion penetration. As a result, the corrosion resistance of the tube, pin, and header surface is enhanced due to the effect of additionally increasing the ductility of the oxide film and the prevention of local corrosion due to Cu. In particular, the corrosion resistance on the brazing joint is improved and the wettability of the clad member is also improved, so that the joint can be protected, thereby improving the corrosion resistance of the overall heat exchanger system. At this time, materials such as tubes, pipes, and headers show improvement effects even when using common commercial aluminum alloys.

Fig. 2 is a conceptual diagram when X element according to the present invention is added to an aluminum alloy for brazing. The X element 11 existing in the brazing zone 9 diffuses into the surface of the pin core 13 and the tube 15 to form a diffusion layer 17 to improve the corrosion resistance of the surface of the pin and the tube Strengthen.

When the cladding material is melted to diffuse the pinned portion and the header to the tube, the tube or the pipe to which the X element is added according to the present invention and a general commercially available clad material are used. The X element of the present invention present in the surface layer of the piping is diluted by the diffusion layer to lower the corrosion resistance and the potential. At this time, if the X element is added to the clad material as in the present invention, it can be compensated.

According to the present invention, it is preferable that the content of X element in the brazing material for brazing of 4XXX series is in the range of 0.51 to 5.0 wt% in consideration of X element to be dispersed and lost, and that of Cu is also 0.50 wt% or less. In this case, the composition of the preferable aluminum alloy is in the range of 4.0 to 17.0 in terms of% by weight, Mn? 0.5, Mg? 2.0 and Zn? 2.0 in weight%. And may further include additional alloying elements (Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y) and unavoidable impurities. In this case, the modified Al 4XXX series alloy to which the X element according to the present invention is added is added to a commercial Al 4XXX series alloy.

On the other hand, in claim 1 of the registered patent application No. 10-1335680, the alloy element Fe is contained in an amount of 0.05 to 0.5 wt%, Zr is 0.1 to 0.5 wt%, MM is 0.01 to 0.5 wt%, Sc is 0.01 to 0.2 wt%, Y is 0.001 to 0.01 wt% Two or more materials are selected from the group of alloying elements to make the total amount of alloying elements to be 0.6 wt% or less and the remainder is aluminum alloy to form aluminum alloy, thereby improving the pressure resistance characteristic of the condenser tube .

This patent document contains the contents of MM (rare earth alloy) and Sc in the X element in the present invention. However, in order to increase the strength of the aluminum alloy, some of Zr, MM, Sc, It is equivalent to an Al composition of 99.4% or more and corresponds to a strain alloy of 1XXX series aluminum alloy. Generally, silicon (Si) is added to the aluminum alloy of the 1XXX series, but it is judged that the above-mentioned Patent Document replaces Si with Zr, MM, Sc, Y or the like.

The above patent documents do not include Si, which is a feature of the modified 1XXX series alloy according to the present invention, and does not include Cu, Mn, Si and Mg, which are the main elements in the present invention, It is also distinct from ideology. In addition, since the Si content is omitted, there is a problem that the production of the alloy is difficult and the production cost is greatly increased. The same applicant's patent document No. 10-1349359 is also the same as described above.

       In claim 1 of the patent 10-1194970, more than one surface of the aluminum alloy plate is made of a metal such as silicon, 4 to 15%, Ag, Be, Bi, Ce, La, Pb, Pd, Sb, Y or misch metal ) Is contained in a brazing aluminum alloy containing 0.01% to 0.5% of at least one element selected from the group consisting of aluminum, This is a modified alloy composition of the 4XXX series, in which the X element is in the range of 0.51 to 1.50 weight%, and the composition range is different from that of the present invention containing Cu, which is also different from the technical idea of increasing the corrosion resistance.

In recent years, research on the addition of rare earth metals has been actively carried out in the field of magnesium alloys. In the field of aluminum alloys, in order to improve corrosion resistance, coatings have been focused on the development of conversion coatings using rare earth elements on the surface of aluminum alloys .

Therefore, in addition to conventional commercial aluminum alloys, the addition of X elements as direct alloying elements is extremely limited, including for cast aluminum alloys, 2XXX series, 1XXX series and 4XXX series. Especially, as in the present invention, there is no literature covering the 3XXX and 6XXX series, which are aluminum alloys for processing, and the composition ranges and the principles of technology are different from those of the present invention in the 1XXX and 4XXX series. In particular, it is judged that there is no literature that relates to the relation with copper (Cu), the increase of the potential of the base material, the lifetime of the oxide film, the improvement of the corrosion resistance and the increase of the strength.

Next, a method of manufacturing a heat exchanger tube or pipe made of an aluminum alloy according to the present invention will be described.

A method of manufacturing a heat exchanger tube or pipe according to the present invention comprises the steps of:

The content of a rare earth metal, scandium (Sc), niobium (Nb), or hafnium (Hf) in the atom X (La) to 71 (Lu) 0.005 to 1.0 wt%, and the Cu content is 0.50 wt% or less,

 (Si + 0.03, (Mn + Mg + Zn) < 1.0 and Al &gt; 98.97 as weight% or Mn 0.25 to 1.4, Mg 0.4 to 1.3, Mn? 1.0 and Zn? 0.25). The base material may further include at least one selected from Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y. There may be more inevitable impurities here. Then, the prepared base material, that is, the aluminum alloy is formed in a molten state by a general aluminum alloy manufacturing method at a temperature range of 670 to 950 캜.

 As an addition method of the X element, it is possible to form a molten alloy by injecting into the melt in the form of individual X element metal or X element alloy of two elements or more or master alloy of Al-X (intermediate alloy). In order to increase the convenience of manufacturing, the X-parent alloy or Al-X parent alloy of the above-mentioned two or more elements may be Cu, Mn, Si, Mg, Zn, Fe, Ti, Zr, Cr, V, Ni, , Or a ternary system or more of a multi-element parent alloy further containing at least one selected from among Pb, Bi, Ca, Be, Ag, Pd, Sb and Y and unavoidable impurities.

A billet or a wire rod formed by casting is formed into the above-formed molten metal or, if necessary, formed into an ingot.

The billet or wire rod is then heat treated at a temperature ranging from 450 to 650 ° C. for 5 to 25 hours, and then the heat-treated billet or wire rod is extruded or drawn to produce a heat exchanger tube or pipe. At this time, it is preferable to preheat the billet in the temperature range of 300 to 550 ° C, to start the extrusion temperature in the temperature range of 300 to 550 ° C, and to terminate the heat exchanger tube at 250 to 350 ° C.

If necessary, it may be manufactured as a non-billet casting product, and then manufactured by a metal firing method such as cold forging or hot forging. If the material is based on the Al 6XXX series, a general age hardening heat treatment can be added.

The composition (% by weight) of the material according to one preferred embodiment of the present invention may be as shown in Tables 1 and 2 below.

 Alloy composition  Cu  X  Mn  Si + Mg  Zn  Al  Preferred Embodiment 0.5 0.005 to 1.0 0.01 to 2.0 <0.65 <4.0  honey.

 Alloy composition  Cu  X  Mn  Si + Mg  Zn  Al  Preferred Embodiment 0.5 0.005 to 1.0 ? 1.0 0.65 to 2.7 ≤ 0.25  honey.

Hereinafter, for better understanding of the present invention, concrete examples (1 to 7) of Table 3 and comparative examples (1 to 2) corresponding thereto will be described in more detail. However, the following examples are only illustrative of the present invention, and the scope of the present invention is not limited thereto.

Aluminum alloys according to the present invention (Examples 1 to 7) and aluminum alloys (Comparative Examples 1 to 2) were prepared. The compositional analysis results of these alloy compositions are shown in Table 3. In Table 3, the composition of these alloys is expressed as% by weight, and it is considered that each alloy may contain unavoidable impurities.

The above-described aluminum alloys (Examples 1 to 7 and Comparative Examples 1 and 2) controlled the temperature of the molten alloy during the casting of the alloy to a temperature in the range of 670 to 950 캜, casted through a casting, and then heat treated. Thereafter, a heat exchanger tube was produced through extrusion.

Thereafter, the heat exchanger tube was subjected to heat treatment at a commonly used brazing treatment temperature and treatment time to reflect the results after the brazing treatment. Since the typical brazing process temperature and treatment time range from 580 to 650 ° C for several minutes to several tens of minutes, the present invention uses heat treatment at 600 ° C for 10 minutes.

In order to evaluate the corrosion resistance of the heat exchanger tube, SWAAT was evaluated according to ASTM standard. The results are shown in Table 3. The SWAAT evaluation was conducted in accordance with ASTM Standard G85, in which glacial acetic acid was added to a 4.2 wt% NaCl solution to maintain the pH of 2.8 to 3.0, and the test was carried out at a pressure of 0.07 MPa under a temperature atmosphere of 49 캜. At this time, the spray amount was maintained at 1 to 2 ml / hr.

 Cu  X Mn  Fe  Si  Zn Mg, Cr, Ti  Al SWAAT
Leak
Time (hr)  Example One 0.30 Ce 0.02 0.50 0.25 0.15 0.10 0.15max  honey. 780 2 0.30 Ce 0.10 0.50 0.25 0.15 0.10 0.15max  honey. 930 3 0.30 Ce 0.30 0.50 0.25 0.15 0.10 0.15max  honey. 880 4 0.30 Hf 0.30 0.50 0.25 0.15 0.05 0.15max  honey. 860 5 0.30 Nb 0.30 0.50 0.25 0.15 0.05 0.15max  honey. 840 6 0.30 La 0.50 0.50 0.25 0.15 0.05 0.15max  honey. 900 7 0.30 Sc 0.30 0.50 0.25 0.15 0.05 0.15max  honey. 860 8 0.05 La 0.35 - 0.25 0.15 - 0.15max  honey. 750 9 0.30 La 0.80 0.05 0.25 0.60 0.05 Mg 1.00  honey. 730 Comparative Example One 0.30 - 0.50 0.25 0.15 0.10 0.15max  honey. 480 2 0.12 - 1.20 0.25 0.40 0.10 0.15max  honey. 350 3 0.05 - - 0.25 0.15 - 0.15max  honey. 360 4 0.30 - 0.05 0.25 0.60 0.05 Mg 1.00  honey. 340

As can be seen from the above Table 3, it can be seen that Examples 1 to 9 are superior to Comparative Examples 1 to 4.

Table 4 shows examples and comparative examples of the aluminum alloy for brazing according to the present invention. The addition of X element and Cu to the clad material shows the effect of adding Al 3003 to the tube, pin core, and header of the heat exchanger. That is, the addition of the X element improves the corrosion resistance, and the addition of Cu also improves the corrosion resistance to some extent.

 Cu  X Mn  Fe  Si  Zn Mg, Cr, Ti  Al SWAAT
Leak
Time (hr)  Example One - La 1.20 - - 8.0 - 0.15max  honey. 730 2 0.12 La 1.20 - - 8.0 - 0.15max  honey. 770 3 0.12 La 3.60 - - 8.0 - 0.15max  honey. 840 Comparative Example One - - - - 8.0 - 0.15max  honey. 420 2 0.12 - - - 8.0 - 0.15max  honey. 460

The heat exchanger tube or piping has the advantage of increasing the corrosion resistance because it can be higher in potential than the fin material and the clad material due to the addition of copper. However, when the copper content is more than 0.1%, copper precipitation in the grain boundary causes copper The content tends to be smaller than in other regions. This results in the dislocations of the grain boundary area being lower than that of the other parts, causing the grain boundary to intensively corrode, resulting in penetration corrosion in the tube or pipe, and the function of the heat exchanger is lost.

According to the present invention, as shown in FIG. 1, the addition of the element X increases the corrosion potential of the alloy, prevents local corrosion of copper, and forms a protective oxide film 3 having good ductility in the grain boundary 1 . Since the protective oxide film 3 has good adhesion, corrosion through the grain boundaries 1 can be minimized. That is, even if corrosion occurs, the corrosion area 5 can not penetrate the crystal grains 7 by the protective oxide film 3.

Therefore, the heat exchanger tube or pipe using the aluminum alloy according to the present invention can be used for a long time without intergranular corrosion or pitting under various corrosive environments.

Meanwhile, when the tube or piping according to the present invention requires greater corrosion resistance, the surface of the heat exchanger tube or pipe may be subjected to a zinc coating (spraying or the like) treatment to give a sacrificial anode effect. It is possible. In order to improve macroscopic corrosion resistance, corrosion resistance of tubes or pipes can be further improved by optimally designing the corrosion potential of the heat exchanger tubes or pipes by appropriately selecting the pin shaft member, head member and clad material which are components of the heat exchanger other than the tubes have. At this time, it is preferable that the corrosion potential of the pin and the head is lower than the corrosion potential of the tube or pipe. In addition, the zinc spraying or coating treatment, the chemical coating treatment and the potential design technique may be applied at the same time. Further, the surface of the heat exchanger tube according to the present invention may further be further coated with silicone or resin to further improve corrosion resistance, and if necessary, additional age hardening heat treatment may be performed for increasing the strength.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

1: grain boundary 3: protective oxide film
5: Corrosive area 7: Grain (grain)
9: brazing zone 11: X element
13: Fin core 15: Tube (tube)
17: diffusion layer

Claims (18)

0.005 to 1.00% by weight of X element and 0.50% by weight or less of copper (Cu);
Mn of 0.01 to 2.0% by weight, Si + Mg < 0.65 and Zn &lt;4.0;
Wherein the X element is at least one of a rare earth metal, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu).
0.005 to 1.00% by weight of X element and 0.50% by weight or less of copper (Cu);
Si? 0.03, (Mn + Mg + Zn) < 1.0 and Al? 98.97 as weight%
Wherein the X element is at least one of a rare earth metal, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu).
0.005 to 1.00% by weight of X element and 0.50% by weight or less of copper (Cu);
0.25 ~ 1.4 Si, 0.4 ~ 1.3 Mg, Mn &lt; = 1.0, Zn &lt; = 0.25,
Wherein the X element is at least one of a rare earth metal, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu).
4. The method according to any one of claims 1 to 3,
Wherein the X element is in the range of 0.01 to 0.60% by weight or 0.05 to 0.50% by weight.
4. The method according to any one of claims 1 to 3,
Wherein the content of Cu is in the range of 0.002 to 0.45% by weight or 0.02 to 0.45% by weight.
0.51 to 5.0% by weight of X element and 0.50% by weight or less of copper (Cu);
Si 4.0 to 17.0, Mn? 0.5, Mg? 2.0, and Zn? 2.0 as weight%
Wherein the X element is at least one of a rare earth metal, scandium (Nb), or hafnium (Hf) of atomic number 57 (La) to 71 (Lu).
The method of any one of claims 1, 2, 3, and 6,
Wherein the aluminum alloy further comprises at least one selected from among Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y Aluminum alloy with improved corrosion resistance.
The content of X element which is at least one selected from rare earth metals, scandium (Sc), niobium (Nb) or hafnium (Hf) in atomic numbers 57 (La) to 71 (Lu) is 0.005 to 1.0% 0.50 wt% or less;
[Mn: 0.01 to 2.0, (Si + Mg) < 0.65 and Zn < 4.0]
[Si? 0.03, (Mn + Mg + Zn) < 1.0 and Al? 98.97% by weight] or
[Si 0.25 to 1.4, Mg 0.4 to 1.3, Mn? 1.0 and Zn? 0.25 in weight%;
In a temperature range of 670 to 950 占 폚;
Casting the molten metal to produce a base material in the form of a billet or a wire rod;
Subjecting the base material to heat treatment at a temperature of 450 to 650 ° C for 5 to 25 hours;
Extruding or drawing the base material;
Wherein the pipe is made of aluminum.
9. The method of claim 8,
Wherein the X element is in the range of 0.01 to 0.60% by weight or 0.05 to 0.50% by weight.
9. The method of claim 8,
Wherein the content of Cu is in the range of 0.002 to 0.45% by weight or 0.02 to 0.45% by weight.
9. The method of claim 8,
Wherein the base material further comprises at least one selected from among Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y A method for manufacturing a tube or a pipe.
9. The method of claim 8,
The method for producing the above-mentioned alloyed molten metal is characterized in that the X metal of the individual element, the X parent alloy of two or more elements (the parent alloy of the X element when the X element is two or more) or the parent alloy of Al- And a parent alloy consisting of an alloy of X elements), wherein the X element is introduced into the molten metal.
13. The method of claim 12,
The X-parent alloy or the parent alloy of Al-X of at least two elements may be at least one selected from Cu, Mn, Si, Mg, Zn, Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, , Ag, Pd, Sb and Y, and is in the form of a multi-component parent alloy having a ternary system or higher.
9. The method of claim 8,
A zinc coating, a harmless coating, a resin coating, and a combination thereof, is further performed on the aluminum tube or the pipe.
The content of X element which is at least one selected from rare earth metals, scandium (Sc), niobium (Nb) or hafnium (Hf) in atomic numbers 57 (La) to 71 (Lu) is 0.005 to 1.0% 0.50 wt% or less;
[Mn: 0.01 to 2.0, (Si + Mg) < 0.65 and Zn < 4.0]
[Si? 0.03, (Mn + Mg + Zn) < 1.0 and Al? 98.97% by weight] or
[Si 0.25 to 1.4, Mg 0.4 to 1.3, Mn? 1.0 and Zn? 0.25 in weight%;
Wherein the aluminum tube or tube having a composition of a lower corrosion potential is coupled to a fin, a header or both with lower corrosion potential than the tube or pipe.
0.5 to 5.0% by weight of an X element which is at least one selected from rare earth metals, scandium (Sc), niobium (Nb) or hafnium (Hf) in atomic numbers 57 (La) to 71 (Lu) 0.50 wt% or less;
Si 4.0 to 17.0 in weight%, Mn? 0.5, Mg? 2.0, Zn? 2.0;
Wherein the aluminum alloy is used as a brazing alloy and is bonded to the fin, the header, or both.
17. The method according to any one of claims 15 to 16,
Wherein the tube or pipe and the brazing alloy further comprise at least one selected from Fe, Ti, Zr, Cr, V, Ni, Co, In, B, Pb, Bi, Ca, Be, Ag, Pd, Sb and Y &Lt; / RTI &gt;
17. The method according to any one of claims 15 to 16,
Wherein any one of the tube, the pipe, the fin, the header and any combination thereof is further subjected to an age hardening heat treatment, a zinc coating, a chemical coating, a resin coating or a combination thereof.
KR1020150144696A 2015-03-25 2015-10-16 Corrosion resistant aluminium alloy for heat exchanger tube, manufacturing method for tube or pipe using the aluminium alloy, and heat exchanger using the same KR101811332B1 (en)

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