Aluminum alloy for heat exchange and production method thereof

Abstract

The invention discloses an aluminum alloy for heat exchange and a production method thereof, and belongs to the technical field of light alloy materials. The aluminum alloy is prepared from, by weight, not larger than 0.015%, not larger than 0.015% of Fe, not larger than 0.005% of Cu, 0.95% to 1.05% of Mg, 0.25% to 0.35% of Mn, 0.05% to 0.12% of Sn, 0.05% to 0.15% of Zr, 0.10% to 0.20% of Er, 0.05% to 0.10% of La, 0.10% to 0.15% of Ce and the balance Al and inevitable impurities. Smelting is carried out through a vacuum intermediate frequency coreless induction furnace, secondary foamed ceramic filtering is carried out under argon pressure maintaining, and the aluminum alloy is continuously cast and extruded into a needed heat exchange pipe with a 90-degree wrap angle in a quantitative CASTEX manner. The problem that due to the fact that metal ions of Cu, Cr, Zn, Ni, Ag, Hg, Pb, Co and other elements are contained in an existing aluminum alloy for a heat exchanger and complexly react with ammonia, the aluminum alloy cannot be applied to the heat exchanger with ammonia as a refrigerant is solved. The aluminum alloy has good corrosion resistance, plasticity and breaking tenacity, high thermal conductivity, long-term heat resistance and other properties. The aluminum alloy is widely used for industrial refrigeration with ammonia as the refrigerant, waste heat utilization, air conditioning, chemical industry, heat-pump water heaters and other heat exchangers.

Description

technical field [0001] The invention discloses an aluminum alloy for heat exchange and a production method thereof, belonging to the technical field of light alloy materials. Background technique [0002] Heat exchange tubes are widely used in industrial refrigeration, waste heat utilization, automotive air conditioners, household air conditioners, and heat pump water heaters. In industrial refrigeration, both ammonia (R717) and Freon (R22) can be used as the refrigerant. When ammonia (R717) is used as the refrigerant, copper with high thermal conductivity (volume heat capacity 3405J / dm 3 K, thermal conductivity 4.01w / cm k) The metal ions in the tube cannot be used as the heat exchange tube of the heat exchanger due to the complexation reaction with ammonia (R717), and the thermal conductivity is usually about 1 / 5 of the thermal conductivity of the copper tube. steel (volume heat capacity 3465J / dm 3 K, thermal conductivity 0.802w / cm k) tube or 1 / 10 stainless steel tube as ...

AI Technical Summary

Problems solved by technology

[0006] The present invention is an aluminum alloy used as a heat exchanger and its preparation method, in order to solve the complexation between metal ions containing Cu, Cr, Zn, Ni, Ag, Hg, Pb, Co and other elements in the existing aluminum alloy used for heat exchangers and ammonia reaction and cannot be used in heat exchangers using ammonia as a refrigerant; this aluminum alloy has good corrosion resistance, plasticity and fracture toughness, high thermal conductivity and long-term heat resistance; it is widely used Used in heat exchangers such as industrial refrigeration with ammonia as refrigerant, waste heat utilization, air conditioning, chemical industry, heat pump water heaters, etc.