Room temperature blackening solution

Details Room temperature blackening solution Room temperature blackening solution

1986-08-11

1988-03-01

Morris, Theodore

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 123, 148 614R, 148 624, C23C 2200, C23C 2248

Patent

active

047283653

ABSTRACT:
A room temperature black coating for ferrous metal is formed in a solution based on selenium dioxide, an inorganic copper salt and an organic acid. The solution virtually eliminates the formation of a selenium iron precipitate which results from conventional blackening agents in which an inorganic acid such as phosphoric, sulfuric, nitric or hydrochloric acid is used. Further, the virtual elimination of the precipitate produces the additional benefit that the user needs handle and ultimately dispose of only an insignificant amount of toxic selenium iron or selenium phosphate compound materials.

REFERENCES:
patent: 2303350 (1942-12-01), Fuller
patent: 2527232 (1950-10-01), Scroxton
patent: 2836526 (1958-05-01), Marosi
patent: 2846343 (1958-08-01), Mason
patent: 2937594 (1960-05-01), Miesse

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