Aluminum alloy composite sheet having long service life

Abstract

The invention provides a long-life aluminum alloy composite thin plate, which at least comprises a core layer and a surface layer, wherein the core layer comprises Al-Mn alloy, and one side or two sides of the core layer are coated with the Al-Si alloy; the Al-Mn alloy of the core layer comprises the components by the following mass percentages: 0.05 to 0.5 weight percent of Si, 0.05 to 0.5 weight percent of Fe, 0.05 to 0.3 weight percent of Cu, 1.0 to 1.6 weight percent of Mn, 0.3 to 0.7 weight percent of Mg, 0.05 to 0.3 weight percent of Zn, and 0.05 to 0.15 weight percent of Cr, and the balance components being Al and inevitable impurities. Through selecting alloy elements preferably and controlling the texture, the prepared aluminum alloy composite thin plate has excellent corrosion resistance on the basis of keeping the alloy to have good mechanical performance, anti-sagging performance and brazing performance, thus the aluminum alloy composite thin plate is very advantageous to production and manufacturing and is a perfect material for producing heat exchanger parts.

Description

technical field [0001] The invention relates to an aluminum alloy, in particular to a long-life aluminum alloy composite thin plate, which belongs to the technical field of nonferrous metals. Background technique [0002] Automobile heat exchangers are subjected to very harsh road environment influences, repeated heat cycles and vibrations during service life, and are often in contact with corrosive media such as ammonia, hydrogen sulfide, hydrides, and acids. Therefore, automotive heat exchangers are required to use Aluminum alloy composite plates, strips, and foil materials must have good strength, brazing, heat dissipation, corrosion resistance, good sagging resistance, and excellent processing properties. [0003] At present, there are few types of aluminum alloy composite panels, strips, and foils produced by domestic enterprises. There is a big gap compared with foreign countries in terms of output and quality. Can not meet the requirements of use very well. With the...

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Problems solved by technology

However, if the Zn content is too high, the corrosion rate of the heat sink is too fast, which will cause the heat sink to lose its heat dissipation effect and reduce its service life

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