Highly corrosion-resistant heat exchanger system using control of alloy composition and alloy potential
AssigneeSP Tech
InventorHee Sik SOHN
Life of this patent
Estimating the term…
Abstract
Disclosed is a technology for improving corrosion resistance of aluminum tubes, aluminum fins, and aluminum headers of a heat exchanger. The heat exchanger includes one or more tubes made of aluminum alloy, one or more headers made of aluminum alloy, one or more brazing header clads, one or more fins (or heat sinks) made of aluminum alloy, and one or more brazing fin clads. The corrosion potential of the tube ranges from −950 mV to −650 mV, the corrosion potential of the header has a difference of 0 mV to 150 mV with respect to the corrosion potential of the tube, and the corrosion potential of the header clad has a difference of −20 mV to 100 mV with respect to the corrosion potential of the tube.
Claims11
A highly corrosion resistant heat exchanger system in which an alloy composition and an alloy potential are differently set for each component of the heat exchanger system, the heat exchanger system comprising:
- one or more tubes made of an aluminum alloy;
- one or more headers made of an aluminum alloy;
- one or more brazing header clads;
- and
- one or more fins (or heat sinks);
- and
- one or more brazing fin clads,
- wherein a corrosion potential of the tube ranges from −950 mV to −650 mV,
- a corrosion potential of the header has a difference of +0 mV to +150 mV with respect to the corrosion potential of the tube,
- a corrosion potential of the header cladding has a difference of −20 mV to +100 mV with respect to the corrosion potential of the tube,
- a Cu content in the aluminum alloy ranges from 0.001% to 0.50% by weight,
- a Zn content in the aluminum alloy ranges from 0.001% to 5.00% by weight, and the tubes, the headers, and the fins are joined by brazing the header clads and the fin clads.
A highly corrosion resistance heat exchanger system in which an alloy composition and an alloy potential are differently set for each component of the heat exchanger system, the heat exchanger system comprising a tube made of an aluminum alloy satisfying conditions specified below (wherein M in a formula below is 1 to 5):
- a content of Cu ranges from 0.001% to 0.50% by weight;
- a content of Zn ranges from 0.001% to 5.00 wt %;
- a content of at least one selected from among Zr and B is 0.001% to 0.25% by weight;
- a content of at least one rare earth metal selected from the group consisting of rare earth metals ranging from lanthanum atoms (La, atomic number 57) to lutetium (Lu, atomic number 71) ranges from 0.001% to 1.00% by weight;
- and
- S % in the following equations ranges from 0.05% to 0.30% by weight,
- Equations:
- where Z % is the content of one or more elements selected from among Zr and B;
- R % is the content of at least one element selected from elements ranging from La (atomic number 57) to Lu (atomic number 71);
- and
- S %=((R %/M)+Z %)
(canceled)
Dependencies are inferred from the claim text.