Method for chromizing small parts

Coating processes – Coating by vapor – gas – or smoke – Metal coating

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427191, 427305, 427347, 4273768, 4273837, 427421, 427427, 148264, 148605, B05D 312, B05D 112, C23C 2224

Patent

active

059120509

ABSTRACT:
An improved process for chromizing commercial quantities of small, industrial, ferrous-based parts, such as but not limited to threaded connectors, pins, bolts, nuts, washers, fasteners, fittings, couplings, studs, etc., uses a retort filled with layers of parts coated with a chromium-containing slurry. The plurality of parts are arranged in layers on sheets of refractory felt paper and are heat treated simultaneously for causing the chromizing reaction between the slurry and the ferrous-based parts.

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patent: 4041196 (1977-08-01), Baldi et al.
patent: 4066806 (1978-01-01), Speirs et al.
patent: 4157001 (1979-06-01), Pickles
patent: 4350719 (1982-09-01), Baldi
patent: 4904501 (1990-02-01), Davis
patent: 5041309 (1991-08-01), Davis et al.
patent: 5135777 (1992-08-01), Davis et al.

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