Novel compound brazed aluminum alloy material for heat exchanger of automobile

Abstract

The invention relates to a compound brazed aluminum alloy material for a heat exchanger of an automobile, which comprises an upper layer leather material, a core material and a lower layer leather material, wherein the upper layer leather material is coated on the upper surface of the core material. The novel compound brazed aluminum alloy material is characterized in that: the lower surface f the core material is coated with an alloy leather material; the lower layer leather material is coated outside the alloy leather material; the core material comprises the following components in percentage by weight: 0.15 to 0.25 percent of Si, 0.35 to 0.50 percent of Fe, 0.08 to 0.15 percent of Cu, 1.10 to 1.20 percent of Mn, less than or equal to 0.10 percent of Zn, less than or equal to 0.03 percent of Ti, less than or equal to 0.05 percent of impurities, and the balance of aluminum; and the AA7072 alloy leather material comprises the following components in percentage by weight: 0.10 to 0.30 percent of Si, 0.20 to 0.40 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.07 percent of Mn, less than or equal to 0.01 percent of Mg, 0.90 to 1.20 percent of Zn, less than or equal to 0.05 percent of individual impurity, and the balance of aluminum. The novel compound brazed aluminum alloy material for the heat exchanger of the automobile has the advantages of increasing the AA7072 alloy leather material, improving the corrosion resistance of the four-layer compound material by 30 percent compared with that of the traditional three-layer compound material, and keeping identical intensity, plasticity and structural homogeneity.

Description

technical field [0001] The invention relates to a composite brazing aluminum alloy material, which is widely used in automobile heat exchanger products such as condensers and evaporators of automobile air-conditioning systems, water tank radiators of engine cooling systems, and the like. Background technique [0002] The automotive heat exchanger is located at the front end of the vehicle and is subject to pollution from rain, dust, mud, gravel and vehicle exhaust, which poses a severe challenge to the anticorrosion of the heat exchanger. The traditional two-layer or three-layer composite brazing aluminum alloy plate is corrosion-resistant The performance is not very good. The aging and scrapping of many heat exchangers working in water environment, such as water tanks, are usually due to surface or inner wall corrosion, especially in areas with a humid climate such as the south, where the corrosion rate and degree are higher. The traditional two-layer or three-layer composi...

AI Technical Summary

Problems solved by technology

[0002] The automotive heat exchanger is located at the front end of the vehicle and is subject to pollution from rain, dust, mud, gravel, and vehicle exhaust, which poses a severe challenge to the anticorrosion of the heat exchanger. The traditional two-layer or three-layer composite brazing aluminum alloy plate is corrosion-resistant The performance is not very good. The aging and scrapping of many heat exchangers working in the water environment, such as water tanks, are usually due to surface or inner wall corrosion, especially in areas with a humid climate such as the south, where the corrosion rate and degree are higher

The traditional two-layer or three-layer composite brazing aluminum alloy plate has low mechanical properties and low corrosion resistance of the core material.