Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1981-03-10
1984-08-07
Silverberg, Sam
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
427252, 427253, 4273839, 427259, 427300, 428208, 428209, B05D 300
Patent
active
044644302
ABSTRACT:
Very good masking of pack diffusion aluminizing on any metal to keep portions from being diffusion coated, is effected by localized coating the lowest layer of which is depletion-reducing masking powder that can have same composition as substrates, mixed with non-contaminating film-former such as acrylic resin. The upper coating layer can be of non-contaminating particles like nickel of Cr.sub.2 O.sub.3 that upon aluminizing or chromizing become coherently held together to form a secure sheath. Such sheath can also be used for holding localized diffusion-coating layer in place. Film-former can be dissolved in volatile solvent, preferably methyl chloroform, in which masking powder or sheath-forming powder is suspended. Chromizing can be performed before aluminizing for greater effects. Aluminized cases are stripped from superalloys by alternating dips in fluoride-containing and fluoride-free aqueous nitric acid.
REFERENCES:
patent: 3764371 (1973-10-01), Baldi
patent: 3785854 (1974-01-01), Baldi
patent: 3801357 (1974-04-01), Baldi
Alloy Surfaces Company, Inc.
Silverberg Sam
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