Production method of aluminum alloy sheet

Abstract

The invention provides a production method of an aluminum alloy sheet. The production method comprises the following steps in sequence: homogenizing and thermally treating aluminum alloy ingot with mass percentage of magnesium of 4.0 to 4.5%; heating; carrying out hot rolling while reserving deflection; cooling to obtain an intermediate aluminum alloy sheet; and rolling the intermediate aluminum alloy sheet to obtain the aluminum alloy sheet. Compared with 5083 alloy in the prior art, the aluminum alloy sheet produced by the production method provided by the invention has the advantages that firstly, the content of the magnesium element is controlled to 4.0 to 4.5%, thus the possibility that the second phase Beta is separated along the grain boundary and subgrain boundary can be reduced, and the corrosion sensitivity of the alloy can be reduced; secondly, the mechanical property and the corrosion resistance of the aluminum alloy sheet are improved under the coordination of the rolling deformation and twice-rolling technology; and thirdly, the internal organization of the alloy can be improved through the homogenizing and thermal treatment, the phenomenon that the structure and content of the aluminum alloy ingot cannot meet the uniformity can be eliminated, and the plastic deformation capacity of the alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a production method of an aluminum alloy plate. Background technique [0002] Aluminum alloy is an alloy based on aluminum, the main alloying elements are copper, silicon, magnesium, zinc and manganese. Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. [0003] The production method of aluminum alloy sheet is to pass aluminum alloy or direct cold casting into ingots, or continuous casting into thick strips, followed by hot rolling to a predetermined thickness, and then cold rolling the strips to the final thickness in a separate process, followed by Heat treatment process to improve the mechanical properties and corrosion resistance of aluminum alloy sheets, improve their processing properties, and o...

AI Technical Summary

Problems solved by technology

Among them, the 5083 alloy is the most used. Its production process mainly relies on secondary cold rolling deformation to improve the mechanical properties of the plate, and then improves its strength and corrosion resistance through heat treatment. Through this production process, the mechanical properties of the aluminum alloy plate can meet the requirements. However, its anti-corrosion performance is unstable, especially for the harsh environment of use, and it cannot meet the requirements of high anti-corrosion performance.