High-strength, high-toughness and corrosion-resistant aluminum alloy plate and preparation method thereof

Abstract

The invention discloses a high-strength, high-toughness and corrosion-resistant aluminum alloy plate and a preparation method thereof. The aluminum alloy plate comprises the following alloy element components in percentage by mass: 0.2 to 0.3 percent of Si, 0.2 to 0.35 percent of Fe, 0.03 to 0.06 percent of Cu, 0.55 to 0.7 percent of Mn, 4.3 to 4.7 percent of Mg, 0.1 to 0.2 percent of Cr, less than or equal to 0.1 percent of Zn, 0.015 to 0.03 percent of Ti and the balance of Al. An aluminum ingot, Al-Cu50, a pure magnesium ingot, Al-Cr50, a Mn alloy ingot and a titanium boron wire are sequentially subjected to smelting, refining, casting, head sawing and face milling, homogenizing heat treatment, hot rolling, cold rolling, intermediate annealing, secondary cold rolling and stabilizing heat treatment, and the aluminum alloy plate is obtained. According to the invention, the problems of unstable performance, poor corrosion resistance and the like caused by loose internal structure, segregation of chemical components and nonmetallic inclusion in the production of the high-strength, high-toughness and corrosion-resistant aluminum alloy plate in the prior art can be solved.

Description

1. Technical field: [0001] The invention relates to a production method of an aluminum alloy plate, in particular to a high-strength, high-toughness, corrosion-resistant aluminum alloy plate and a preparation method thereof. 2. Background technology: [0002] High-strength, high-toughness, corrosion-resistant aluminum alloys are key materials for lightweight and high-speed aerospace and modern transportation (including high-speed trains, light rail trains, luxury passenger cars, cars, ships, cruise ships, tank cars, containers, etc.). It enables aircraft and spacecraft to fly higher, faster and farther, reduces traction and saves a lot of energy, makes vehicles high-speed and safe, and can adapt to various operating environments. The alloy has a fine and uniform structure, good weldability, tensile strength ≥ 350Mpa, escorts safe travel, exfoliation corrosion N level, intergranular corrosion mass loss per unit area ≤ 5mg / c㎡, which provides a guarantee for the normal operatio...

AI Technical Summary

Problems solved by technology

Through the technical solution of the present invention, the existing problems in the production of high-strength, high-toughness, and corrosion-resistant aluminum alloy plates can be solved, such as unstable performance and poor corrosion resistance caused by loose internal structure, chemical composition segregation, and non-metallic inclusions.

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