Brazing fin stock for use in aluminum base alloy heat exchanger
AssigneeSumitomo Light Metal Industries, Ltd.
InventorsYoshio Baba, Zenichi Tanabe, Toshiyasu Fukui, Hiroshi Ikeda
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Abstract
A sacrificial brazing fin stock for use in an aluminum base alloy heat exchanger comprises an aluminum base alloy core having a grain size of 100 .mu.m or more and consisting essentially of 0.5 to 2 wt. % manganese plus iron, said manganese being more than iron, 0.1 to 0.7 wt. % zinc, 0.001 to less than 0.02 wt. % tin, and balance aluminum and a cladding consisting of one material selected from an Al-Si base alloy and an Al-Si-Mg base alloy. The above fin stock protected a main tube of the heat exchanger from a pitting corrosion and led to a greatly expanded use of the aluminum base alloy heat exchanger.
Claims6
A brazing fin stock comprising a core clad with a cladding layer,
- said core having a grain size of 100 .mu.m or more and being made of an aluminum base alloy consisting essentially of
- from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 .mu.m or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum,
- said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon and the balance is aluminum.
A brazing fin stock comprising a core clad with a cladding layer,
- said core having a grain size of 100 .mu.m or more and being made of an aluminum base alloy consisting essentially of
- from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 .mu.m or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum,
- said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon, from 0.1 to 2 wt.% of magnesium and the balance is aluminum.
A brazing fin stock comprising a core clad with a cladding layer,
- said core having a grain size of 100 .mu.m or more and being made of an aluminum base alloy consisting essentially of
- from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 .mu.m or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum,
- said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon, from 0.001 to 0.2 wt.% of bismuth, from 0.001-0.1 wt.% of beryllium and the balance is aluminum.
Dependencies are inferred from the claim text.