Method of chromizing large size articles

Details Method of chromizing large size articles Method of chromizing large size articles

1990-01-31

1990-10-16

Morgenstern, Norman

Coating processes

Coating by vapor, gas, or smoke

Metal coating

427252, 427250, 4272554, 427237, 118717, 118725, C23C 1600

Patent

active

049633953

ABSTRACT:
A chromium coating process for coating large size articles such as boiler tubes and boiler tube assemblies, comprises the steps of: (a) mounting on a stationary foundation a retort having a removable cover; (b) covering the articles to be coated in the retort by a chromium source powder containing 3% of ammonium chloride and 42% ferrochromium, the balance consisting of alumina; (c) sealing the cover on the retort; (d) heating the retort to a uniform temperature of 2100.degree. F. for 10 hours; (e) supplying concurrent with the commencement of the heating an inert gas to the interior of the retort; (f) terminating the heating of the retort and shutting off the flow of the inert gas to the retort; (g) cooling the retort and the articles within the retort uniformly throughout to a temperature of 400.degree. F.; (h) removing the cover from the retort; (i) removing the coated articles therefrom.

REFERENCES:
patent: 3622374 (1971-11-01), Pike
patent: 4156042 (1979-05-01), Hayman et al.
patent: 4232098 (1980-11-01), Park et al.
patent: 4290391 (1981-09-01), Baldi
patent: 4308160 (1981-12-01), Baldi
patent: 4528215 (1985-07-01), Baldi et al.

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