Lightweight aluminum alloy sheet and method for manufacturing the same

Abstract

The application provides a lightweight aluminum alloy plate and a preparation method thereof. The preparation method comprises the following steps: S1, heating aluminum alloy ingot to 480-510 DEG C for extrusion molding, and controlling the profile temperature at the extrusion outlet to be 520-545 DEG C to obtain an extruded profile; S2, quenching the extruded profile at the extrusion outlet, the cooling speed is 40-80 DEG C / s, the surface temperature of the extruded profile is reduced to less than or equal to 60 DEG C to obtain a quenched profile; S3, pretreating the quenched profile, then performing electrostatic powder spraying to obtain a sprayed profile; and S4, feeding the sprayed profile into a curing oven, performing heat preservation treatment, and cooling to obtain the lightweight aluminum alloy plate. The application integrates extrusion, online solid solution, rapid quenching, pretreatment and powder spraying baking into one, and the independent solid solution and artificial aging are omitted, the production cycle is shortened from 2-3 days to 4-6 hours; the profile does not need to be heated to 530 DEG C for solid solution, and an independent aging furnace is not needed, and the comprehensive energy consumption is reduced by 50-60%.

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