CN104264005A

CN104264005A - Corrosion-resistant aluminum alloy and air conditioner heat exchanger

Info

Publication number: CN104264005A
Application number: CN201410502102.3A
Authority: CN
Inventors: 郭宏林; 李中伟; 高延刚; 张利娟; 张磊
Original assignee: Golden Dragon Precise Copper Tube Group Inc
Current assignee: Golden Dragon Precise Copper Tube Group Inc
Priority date: 2014-09-26
Filing date: 2014-09-26
Publication date: 2015-01-07

Abstract

The invention provides a corrosion-resistant aluminum alloy and air conditioner heat exchanger with low cost and good corrosion resistance. The corrosion-resistant aluminum alloy comprises the following components in percentage by weight: 0.70-1.20% of Mn, less than 0.25% of Si, 0.05-0.45% of Fe, less than 0.10% of Cu, less than 0.10% of Cr, less than 0.05% of Zr, 0.02-0.10% of Ti and the balance of aluminum. By adopting the corrosion-resistant aluminum alloy and the air conditioner heat exchanger provided by the invention, the grain structure of the aluminum alloy can be significantly refined, the mechanical performance of the alloy can be improved, and the hot cracking tendency of the alloy can be reduced, therefore, the heat processing performance, welding performance and corrosion resistance of the aluminum alloy can be improved, and the cost of the aluminum alloy can be reduced; and the corrosion-resistant aluminum alloy is particularly suitable for an industrial product such as the air conditioner heat exchanger with high requirements for the environment.

Description

Anticorrosion aluminium and air-condition heat exchanger

Technical field

The present invention relates to a kind of aluminium alloy, especially a kind of anticorrosion aluminium and air-condition heat exchanger.

Background technology

In recent years, the product such as aluminum alloy pipe fitting, fin is more and more widely used on air-condition heat exchanger and relevant annex thereof.1 is (comprising 1050,1060 etc.) because having good resistance to corrosion and plastic performance and good welding property, be widely used, but its product strength is slightly low, limits it and use.3 be (mainly 3003,3102 etc.) by adding a certain amount of Mn in the alloy, improve the intensity of alloy, and keep good ductility, thermal conductivity and good weldability energy, now be widely used in the industries such as automobile, refrigeration, chemical industry, in order to make radiating pipe and the radiator element of heat exchanger.

3003 alloys of present widespread use, have higher intensity and plastic performance, and acceptable corrosion resistance nature.In recent years, along with perfect further for copper technology of refrigeration industry aluminium, the tube wall thickness adopted is even lower from the near 0.4mm of 0.8mm gradually.The reduction inevitable requirement material of tube wall thickness has suitable intensity, good plastic and excellent resistance to corrosion.

3003 alloys are except easily occurring except spot corrosion, and in refrigeration industry use procedure, generally find that intensity is slightly high, unit elongation is lower slightly, affect curved, swollen, the expansion process of tubing.

Summary of the invention

The invention provides that a kind of cost is low, the anticorrosion aluminium of corrosion resistance and good and air-condition heat exchanger.

Realize the anticorrosion aluminium of one of the object of the invention, comprise following composition (by weight percentage):

Mn content 0.70 ~ 1.20%;

Si content is less than 0.25%;

Fe content 0.05 ~ 0.45%;

Cu content is less than 0.10%;

Cr content is less than 0.10%;

Zr content is less than 0.05%;

Ti content 0.02 ~ 0.10%;

All the other are aluminium.

Described Mn content is preferably 0.80 ~ 1.1%, and described Si content is preferably less than 0.2%, and described Fe content is preferably 0.10 ~ 0.4%.

Described Mn content is preferably 0.90 ~ 1.0%, and described Si content is preferably less than 0.10%, and described Fe content is preferably 0.15 ~ 0.35%.

Described Cu content is preferably less than 0.05%.

Described Cr content is preferably 0.02 ~ 0.08%, and described Ti content is preferably 0.02 ~ 0.08%.

Described Cr content is preferably 0.02 ~ 0.05%, and described Ti content is preferably 0.02 ~ 0.05%.Described Zr content is preferably 0.02 ~ 0.05%.

Realize the air-condition heat exchanger of the object of the invention two, comprise radiating pipe and/or radiator element, the material of described radiating pipe and radiator element is above-mentioned anticorrosion aluminium.

The beneficial effect of anticorrosion aluminium of the present invention and air-condition heat exchanger is as follows:

Unexpectedly, the trace element of anticorrosion aluminium is controlled proportioning as described in the present invention, can the grain structure of remarkable refining aluminum alloy, put forward heavy alloyed mechanical property, low-alloyed hot cracking tendency falls, simultaneously under the prerequisite of electroconductibility substantially not affecting material of the present invention, the hot workability of alloy, welding property and solidity to corrosion can be improved, and reduce aluminium alloy cost.

In addition, the anticorrosion aluminium of constituent content of the present invention is used can to significantly improve the corrosion resistance of material.

Embodiment

The embodiment of anticorrosion aluminium of the present invention is as follows:

Composition configuration is carried out by following weight ratio:

Be that the aluminum pipe of 7mm carries out performance measurement to above-mentioned aluminium alloy extruded diameter of making, tensile property is by " metallic substance may well ask stretching test method " GB/T228.1-2010; The corrosion-resistant salt-fog test of SWAAT is by " remodeling salt-fog test method " ASTM/G85-1998 A3 (seawater salification cycles test method); Tubing enlarging inspection is by " flaring test on tube of metal method " GB/T242-2007; Bending pipes test is by " metal tube bend test method " GB/T244-2008; Welding test uses copper pipe and 3003/4045 composite pipe to weld respectively.

Test result is as follows:

Note:

1, SWAAT test-results is exemplar hydraulic pressure numerical value after 720h.

2, enlarging rate test is for ensureing that in use procedure, enlarging is not split.

Other performance tests:

Bending: orange peel and wrinkling does not all appear in 4 ~ No. 9 aluminum pipe surfaces in subsequent forming.1, No. 3 aluminum tube bending crackings.

Weldability: link with copper pipe and weld well is good with 3003/4045 multiple-unit tube soldering.

, there is not the product quality defect because starting material cause in formability: extrusion process is smooth and easy.

According to the test-results of embodiment, in alloy, the too high tubing intensity that causes of Cu, Fe, Si constituent content is too high, and unit elongation declines, and cracking appears in bend pipe, especially poor corrosion resistance.In the alloy adding Zr element, common manifestation goes out good corrosion resistance characteristic, and show good formability and welding property, but Zr constituent content improves few more than continuing to improve content after 0.05wt% to the corrosion resistance nature of tubing, but resistance to yield strength reduces, and presents the bad structure of other performances.

Embodiment recited above is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; do not departing under the present invention designs spiritual prerequisite; the various distortion that the common engineering technical personnel in this area make technical solution of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.

Claims

1. an anticorrosion aluminium, comprises following composition (by weight percentage):

Mn content 0.70 ~ 1.20%;

Si content is less than 0.25%;

Fe content 0.05 ~ 0.45%;

Cu content is less than 0.10%;

Cr content is less than 0.10%;

Zr content is less than 0.05%;

Ti content 0.02 ~ 0.10%;

All the other are aluminium.

2. anticorrosion aluminium according to claim 1, is characterized in that: described Mn content is 0.80 ~ 1.1%, and described Si content is for being less than 0.2%, and described Fe content is 0.10 ~ 0.4%.

3. anticorrosion aluminium according to claim 2, is characterized in that: described Mn content is 0.90 ~ 1.0%, and described Si content is for being less than 0.10%, and described Fe content is 0.15 ~ 0.35%.

4. anticorrosion aluminium according to claim 1, is characterized in that: described Cu content is less than 0.05%.

5. anticorrosion aluminium according to claim 1, is characterized in that: described Cr content is 0.02 ~ 0.08%, and described Ti content is 0.02 ~ 0.08%.

6. anticorrosion aluminium according to claim 5, is characterized in that: described Cr content is 0.02 ~ 0.05%, and described Ti content is 0.02 ~ 0.05%.

7., according to the arbitrary described anticorrosion aluminium of claim 1 ~ 6, it is characterized in that: described Zr content is 0.02 ~ 0.05%.

8. an air-condition heat exchanger, comprises radiating pipe and radiator element, and the material of described radiating pipe and/or radiator element is the arbitrary described anticorrosion aluminium of claim 1 ~ 7.