Aluminum Alloy Heat Exchanger

摘要

A core material contains Mn: 0.3-2.0 mass % (hereinafter, abbreviated to %), Si: 1.5% or less, Fe: 0.1-1.0% and Cu: 0.05-1.0%, and comprises a remainder Al and unavoidable impurities, and the sacrificial anode material contains Fe: 0.05-1.0% and Zn: 0.5-5.0%, and comprises a remainder Al and unavoidable impurities. A potential at the joint section between the header pipe and the tube is lower by 30 mV or less than potentials at the header pipe surface and the tube surface, and the potential at the joint section is lower by 30-100 mV than a potential at a position in a depth of one quarter of the overall thickness from the header pipe surface and a potential at a position in a depth of one quarter of the overall thickness from the tube surface.

主权项

1. An aluminum alloy heat exchanger, wherein
a plurality of tubes comprising fluid passages therein are arranged in parallel to each other, a corrugated fin is sandwiched between the adjacent tubes, header pipes are arranged on both ends of the tubes, and the tubes, the fins and the header pipes are integrated by brazing, wherein: the header pipe is composed of an aluminum alloy cladding material comprising an aluminum alloy core material and a sacrificial anode material for cladding at least one side of the core material; the core material contains Mn: 0.3-2.0 mass % (hereinafter, abbreviated to %), Si: 1.5% or less, Fe: 0.1-1.0% and Cu: 0.05-1.0%, and comprises a remainder Al and unavoidable impurities; the sacrificial anode material contains Fe: 0.05-1.0% and Zn: 0.5-5.0%, and comprises a remainder Al and unavoidable impurities; a potential at the joint section between the header pipe and the tube is less noble by 30 mV or less than potentials at the header pipe surface and the tube surface; and the potential at the joint section is less noble by 30-100 mV than a potential at a position in a depth of one quarter of the overall thickness from the header pipe surface and a potential at a position in a depth of one quarter of the overall thickness from the tube surface.