Water-based shielding compositions for locally protecting metal

Details Water-based shielding compositions for locally protecting metal Water-based shielding compositions for locally protecting metal

1992-01-21

1993-12-14

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524204, 524375, 524376, 524555, 148 28, 427156, C08K 308

Patent

active

052703746

ABSTRACT:
An anti-nitriding composition comprising a water-based alkyd resin having suspended therein particulate tin and titanium dioxide; a thixotropic agent maintains the particulates in suspension during storage and application; the composition includes surfactant and co-solvent to impart paint-like characteristics. The composition is suitable for use as a local shield during the heat treatment of metals to prevent nitriding or ferritic nitro-carburization at temperatures in the range of about 850.degree. F. to about 1150.degree. F. The water-based formulation is safe to use and to transport, and has an air drying time at normal working temperatures comparable to those drying times previously achievable only with organic-solvent based anti-nitriding compositions.

REFERENCES:
patent: 2367978 (1945-01-01), Troy
patent: 2485176 (1940-10-01), Waterfall
patent: 3661820 (1992-05-01), Foreman et al.
patent: 4146516 (1979-03-01), Braun et al.
patent: 4366185 (1982-12-01), Tanaka et al.
patent: 4719038 (1988-01-01), Sobata et al.
patent: 5110854 (1992-05-01), Ratcliff

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