Preparation method of medium-strength corrosion-resistant aluminum alloy sheet materials

Abstract

The invention belongs to the field of metal materials and a machining and a preparation thereof, and discloses the preparation method of medium-strong corrosion-resistant aluminum alloy sheet materials. The preparation method comprises the following steps of designing the components of the aluminum alloy sheet materials; (2) smelting and casting, smelting the components, and casting into an aluminum alloy slab ingot; (3) homogenizing heat treatment and hot rolling, the aluminum alloy slab ingot head-removing milling six-surface, the aluminum alloy slab ingot is heated at the temperature of 480DEG C-510 DEG C, the heat preservation time is 6-12 hours, and the aluminum alloy slab ingot does not need to be cooled to the room temperature; when the temperature is reduced to be 480 DEG C or below, hot rolling is started, the hot rolling temperature ranges from 300 DEG C to 480 DEG C, and after 5-8 passes, the total deformation amount reaches 80%, (4) cold rolling, carrying out cold rollingto enable the cold rolling to reach the required thickness size of the sheet materials; and (5) carrying out the heat treatment and control, specifically, carrying out low-temperature annealing treatment on the cold-rolled sheet materials according to the requirements of the use performance of the aluminum alloy sheet materials. According to the preparation method, the problems of poor corrosion resistance, low efficiency and great internal stress in the traditional aluminum alloy sheet materials preparation process are solved.

Description

technical field [0001] The invention belongs to the field of metal materials and their processing and preparation, and in particular relates to a method for preparing medium-strength corrosion-resistant aluminum alloy plates. Background technique [0002] Al-Mg alloy is an aluminum alloy that cannot be strengthened by heat treatment. Its main characteristics are medium and high strength, good corrosion resistance, and it is also called anti-rust aluminum. Therefore, it is widely used in packaging materials and marine equipment materials. In recent years Since then, with the rapid development of marine technology, Al-Mg alloys have been used more and more widely, such as military aircraft carriers, cruisers, destroyers, submarines, etc., and a large number of components such as bridges, decks, cabins, masts, and aircraft launchers are used. Al-Mg alloy. Al-Mg alloys are also widely used in civilian high-speed boats, fishing boats, and liquefied natural gas boats. [0003] T...

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Problems solved by technology

[0004] 1. Al-Mg alloys have high requirements for corrosion resistance, and the presence of impurity element Fe reduces the corrosion resistance of the alloy;

[0005] 2. Homogenization annealing takes a long time, resulting in low efficiency;

In addition, the rolling process is a dynamic process. It is difficult to accurately monitor the rolling temperature, especially for larger aluminum alloy slabs. The mechanical properties of the plates often meet the standards, but there is a lot of internal stress, and the corrosion resistance does not meet the requirements

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