Method for protecting the inner surface of a copper alloy conden

Details Method for protecting the inner surface of a copper alloy conden Method for protecting the inner surface of a copper alloy conden

1981-04-21

1983-01-18

Hoffman, James R.

Metal treatment

Compositions

Heat treating

148 631, 148 635, B05D 304, B05D 102, B05D 722, B05D 312

Patent

active

043690734

ABSTRACT:
A thin corrosion protective film of an iron oxide can be formed on the inner surface of a condenser tube made of a copper alloy by first applying on the inner surface a thin layer of an acidic suspension containing iron powder and then exposing the thus-coated inner surface to an atmosphere of an oxidizing gas. The above method can be carried out in a relatively short period of time and also in a relatively simple fashion. The resultant protective film is uniform and hardly reduces the thermal conductivity of the condenser tube, thus ideal as a protective film for condenser tubes of a heat exchanger.

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