Heat exchanging apparatus and a method of preventing corrosion

Details Heat exchanging apparatus and a method of preventing corrosion Heat exchanging apparatus and a method of preventing corrosion

1992-06-24

1995-01-03

Makay, Albert J.

Refrigeration

Processes

Evaporation induced by sorption

62476, 62DIG20, F25B 2900

Patent

active

053774949

ABSTRACT:
A heat exchanging apparatus includes a composite structure of a ferrosoferric oxide and a molybdenum oxide at the internal surface of a heat exchange cycle tube located in a generator. A process of suppressing corrosion of this heat exchanging apparatus includes the step of preparing an ammonia solution including dissolved oxygen of a concentration of approximately 3-8 ppm. Approximately 1 wt %-5 wt % molybdate is added into the ammonia solution. This ammonia solution is sealed within the heat exchange cycle tube to be heated to at least a predetermined temperature in the generator of the heat exchanging apparatus. Thus, a composite structure of a ferrosoferric oxide and molybdenum oxide is formed on the internal surface of the generator. This composite structure allows the suppression of corrosion in the internal surface of the generator.

REFERENCES:
patent: 1922203 (1933-08-01), Hedlund
patent: 2755170 (1956-07-01), Stubblefield
patent: 2797557 (1957-07-01), Kogel
patent: 4801393 (1989-01-01), Erickson
patent: 4912934 (1990-04-01), Itoh et al.
patent: 5127234 (1992-07-01), Woods, Jr.
Industrial Material List (First Edition) by Saichi Banno, Nikkan Industrial Newspaper, p. 934.
Proceedings International Congress Metals Corrosion, 1984, vol. 3, pp. 50-56.

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