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A kind of highly corrosion-resistant multi-layer composite aluminum alloy pipe and its production method

A multi-layer composite and corrosion-resistant technology, which is applied in the field of brazing high-corrosion-resistant multi-layer composite aluminum alloy pipes and its production, can solve the problems of reducing alloy strength, reducing strength, corrosion, etc., to improve corrosion resistance, Effect of improving strength and improving corrosion resistance

Active Publication Date: 2021-02-02
HUAFON NIKKEI ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But what the barrier layer in this invention adopts is AA7072 alloy, can reduce the intensity of alloy to a certain extent
And although the corrosion potential of the AA7072 alloy is relatively low, it can play a good "anodic protection" effect on the core material with a relatively positive potential, but the potential difference between the barrier layer and the core layer is not very large, and it cannot play a role in some special environments. to good protection
[0006] CN 103122427A of Zhang Bin et al. discloses an aluminum alloy composite plate for brazing and its manufacturing method, wherein the core layer contains higher Si elements, which can consume more waste materials in the production process and reduce raw material costs and energy consumption , but in the process of high temperature furnace brazing, serious corrosion and other problems are prone to occur
The barrier layer alloy used is AA1050 plus 0.5% to 3.5% Zn. Although the barrier layer can play a better role in "anodic protection" of the core material, it will reduce the overall strength of the material

Method used

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  • A kind of highly corrosion-resistant multi-layer composite aluminum alloy pipe and its production method
  • A kind of highly corrosion-resistant multi-layer composite aluminum alloy pipe and its production method
  • A kind of highly corrosion-resistant multi-layer composite aluminum alloy pipe and its production method

Examples

Experimental program
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Effect test

Embodiment A1、A2

[0026] Embodiment A1, A2, B1~B4, comparative example A3, A4, B5, B6

[0027] Examples A1, A2, B1-B4 and comparative examples A3, A4, B5, B6 are examples of alloy material smelting. Select the high-purity aluminum (Al) material with a purity of 99.99% (mass fraction, the same below), the zinc (Zn) material with a purity of 99.9%, the magnesium (Mg) material with a purity of 99.9%, and the silicon (Mg) material with a purity of 99.9%. Si) powder, and Al-50% Cu, Al-10% Mn master alloy material are raw materials, carry out proportioning according to the composition of barrier layer alloy and core layer alloy listed in Table 1 and Table 2 according to alloy respectively, in melting Melting in a furnace at a melting temperature of 720-780°C; adding a slag remover and removing slag; casting into barrier layer alloy ingots, cladding layer alloy ingots and core layer alloy ingots; Annealing for 10 hours to obtain the required core alloy ingot and barrier layer alloy ingot.

[0028] T...

Embodiment 1～6、 comparative example 1～5

[0034] The barrier layer alloy ingots obtained in Examples A1-A4 and the core layer alloy ingots obtained in B1-B6 were cut and milled to remove risers and skins; after face milling, they were heated to 480° C. Chemical treatment, heat preservation for 2 to 4 hours, hot rolling at 470 to 500°C, final rolling temperature at 340°C, rolling to 10 to 40mm according to different compounding ratios; cutting and milling the purchased cladding alloy ingot , remove the riser and skin; according to the composite ratio listed in Table 3, laminate in the order of 1-cladding layer alloy 1, 2-barrier layer alloy, 3-core layer alloy and 4-cladding layer alloy 2, connect After combination, heat to 480°C in an annealing furnace, keep warm for 2-4 hours, carry out hot rolling, the rolling thickness is 3-5mm; then cold rolling, the processing rate of the finished product is 80%-95%, and the rolling thickness is 0.15-0.5mm , and finally annealed at 240-300°C for 1-3 hours to the finished product ...

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Abstract

The invention relates to a high-corrosion-resistant multilayer composite aluminum alloy pipe and its production method. It is composed of cladding layer alloy 1, barrier layer alloy, core layer alloy and cladding layer alloy 2, which are sequentially laminated and rolled. The barrier layer alloy is composed of the following elements by mass fraction: 0.5% to 1.0% of Si, 0.15% to 0.7% of Fe, 1.0% to 2.0% of Mn, 0.05% to 0.2% of Mg, 1.5% to 3.5% of Zn, 0-0.15% Cu, other elements with a single content ≤ 0.05% and a total content ≤ 0.15%, and the balance is Al. The barrier layer is an Al-Mn alloy with a certain content of Zn added to provide sacrificial protection. The optimal content of Zn in the barrier layer is 1.5% to 3.5% by mass fraction, and the potential difference with the core layer is 60 to 140mV. The layer provides protection and maximizes the corrosion resistance of the material.

Description

technical field [0001] The invention relates to a multilayer composite aluminum alloy pipe and its production method, in particular to a high corrosion-resistant multilayer composite aluminum alloy pipe suitable for brazing of B-shaped pipes, U-shaped pipes and hourglass pipes of aluminum radiators. and its production method. [0002] technical background [0003] Multi-layer composite brazing aluminum alloy materials are widely used in heat exchanger systems, such as automobile radiators, intercoolers, air conditioner condensers, evaporators, etc. Carriers for heat exchange are generally liquids such as water, refrigerant, oil, etc. These liquids are combined with automobile exhaust gas or refrigerant to circulate in the heat exchanger tube material, which will have a great corrosion effect on the material. Once the tube material is damaged If corrosion occurs and leaks, the product will be scrapped, so improving the corrosion resistance of multilayer composite brazing alum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C21/00C22C21/02C22C21/14C22C21/16C22C1/03C22F1/04C22F1/043C22F1/053C22F1/057
Inventor 谢永林高勇进李正伟廖永启
Owner HUAFON NIKKEI ALUMINUM
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