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Aluminium alloy with intergranular corrosion resistance, metods of manufacture and its use

A technology of aluminum alloy and alloy, which is applied in the field of aluminum alloy and can solve problems such as grain growth

Inactive Publication Date: 2009-10-14
ALUMINUM CO OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Another problem with the improved alloys is that in some cases the processed or extruded product must be further cold worked or drawn to meet the dimensional requirements of the product
This additional cold working results in a higher stored energy in the matrix of the material and, during subsequent brazing cycles, this additional energy manifests as grain growth. As a result, although these materials are designed with fine grains to Controlling intergranular corrosion, however, obtaining fine grains in the product prior to brazing does not always ensure adequate corrosion protection of the material in its final assembled state.

Method used

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  • Aluminium alloy with intergranular corrosion resistance, metods of manufacture and its use
  • Aluminium alloy with intergranular corrosion resistance, metods of manufacture and its use
  • Aluminium alloy with intergranular corrosion resistance, metods of manufacture and its use

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Embodiment Construction

[0039] DESCRIPTION OF THE PREFERRED EMBODIMENT

[0040] The present invention has significant advantages in the field of corrosion-resistant aluminum alloys, in particular for the manufacture of round and flat tubes, for example for heat exchanger applications such as those used in vehicles such as condensers and others Uses, such as air conditioners, refrigerators, etc.

[0041] The present invention is different from the prior art of improving corrosion resistance by controlling the chemical composition of intermetallic compounds and obtaining fine grain size. The alloy of the present invention utilizes the content and ratio of alloying elements so that the electrical properties of the alloy matrix and grain boundaries The chemical potential is matched. By specifying / controlling the amount and ratio of alloying elements, a balance can be established between the electrochemical potential of the matrix and the grain boundary, that is, the corrosion potential difference between...

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Abstract

A corrosion-resistant aluminum alloy with controlled amounts of iron, manganese, chromium, and titanium, and containing copper, silicon, nickel, and zinc at no more than impurity levels. The chemical composition of the alloy is adjusted to match the electrolytic potential at the grain boundaries with the alloy matrix, thereby reducing intergranular corrosion. The alloy is particularly suitable for the production of tubes in heat exchangers using extrusion and brazing techniques.

Description

technical field [0001] The present invention relates to an aluminum alloy and its preparation method and application, in particular to a controllable amount of iron, manganese, chromium and titanium for obtaining corrosion resistance, especially intergranular corrosion resistance, and a controllable amount zinc aluminum alloy. Background technique [0002] In the prior art, several corrosion-resistant aluminum alloys have been developed for use in round and flat pipes, such as heat exchangers and condensers. Some of these alloys are described in US Patents 5,906,689 and 5,976,278. These two The applicants for the two US patents are all Sircar. [0003] U.S. Patent 5,906,689 (the '689 patent) discloses an aluminum alloy using manganese, titanium, small amounts of copper, and zinc. [0004] U.S. Patent 5,976,278 (the '278 patent) discloses an aluminum alloy having controlled amounts of manganese, zirconium, zinc, small amounts of copper, and titanium. The '278 patent is in s...

Claims

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Application Information

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IPC IPC(8): C22C21/00F28F21/08C22F1/00C22F1/04
CPCC22C21/00
Inventor B·任
Owner ALUMINUM CO OF AMERICA
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