Method for protecting the inner surface of a copper alloy condenser tube from corrosion
US4369073A · kind A · utility
4Cited by
0References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1981 |
| Grant date | Jan 18, 1983 |
| Priority date | — |
| Expiry date | Apr 21, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F19/06
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.