Uacj Corporation

Denso Corporation

Uacj Copper Tube Corporation

Njt Copper Tube Corporation

Yoshihiko Kyo

Yoshiyuki Oya

Atsushi Fukumoto

Tomohiro Shoji

Takahiro Shinoda

Naoto Goto

Hirokazu Tamagawa

Koichi Nakashita

An aluminum alloy heat exchanger includes a core material formed of an aluminum alloy comprising Mn of 0.60 to 2.00 mass % and Cu of 1.00 mass % or less, with the balance being Al and inevitable impurities, and a sacrificial anode material formed of an aluminum alloy comprising Zn of 2.50 to 10.00 mass %, with the balance being Al and inevitable impurities. Pitting potential of a sacrificial anode material surface of a tube of the aluminum alloy heat exchanger in a 5% NaCl solution is −800 (mV vs Ag/AgCl) or less, and pitting potential of an aluminum fin of the aluminum alloy heat exchanger in a 5% NaCl solution is less than the pitting potential of the sacrificial anode material surface of the tube of the aluminum alloy heat exchanger in a 5% NaCl solution.

Aluminum alloy heat exchanger

Provided is a corrosion resistant copper tube which can exhibit a further improved resistance to ant nest corrosion, and which is suitably usable as a heat transfer tube and refrigerant tube in air-conditioning equipment and refrigerating equipment. The copper tube is formed of a copper material comprising a copper alloy consisting of 0.15-0.50% by weight of phosphorus and the balance being copper and impurities, wherein the copper material includes phosphorus oxide particles, such that a number density of particles having a circle equivalent diameter of not less than 0.1 &#x3bc;m among the phosphorus oxide particles is not more than 50000/mm.

Highly resistant copper tube against ant nest corrosion

Growing community of inventors

Tokyo, Japan

Yoshihiko Kyo