Volatile anodizing electrolytes for tantalum

Details Volatile anodizing electrolytes for tantalum Volatile anodizing electrolytes for tantalum

1986-08-11

1987-09-08

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 141, 204 585, 428469, C25D 1100

Patent

active

046922245

ABSTRACT:
A dielectric film is formed on tantalum pellets by anodization up to 350 V in an electrolyte of an aqueous solution of an organic carboxylic acid with an ionization constant between 10.sup.-2 and 10.sup.-5. The tantalum pellets are suspended from aluminum-magnesium alloy bars into the electrolytic solution with the bar itself being suspended in the electrolyte. The organic carboxylic acid solute residue from anodization is readily volatile at 200.degree. C. The acid is sometimes combined in the electrolyte with ammonia or an amine having a boiling point less than 200.degree. C.; the electrolyte residues from anodization in these systems are also volatile at 200.degree. C. After anodization, tantalum pellet and aluminum-magnesium bar cleanup is thus accomplished by a brief heat treatment at 200.degree. C., eliminating the need for an extended rinse procedure.

REFERENCES:
"Basic Princ. of Org. Chem." Roberts et al, Cal. Tech., W. A. Benjamin Inc., 1965, p. 507.
Handbook of Chem. & Physics, 32nd Ed., Chem. Rubber Co., 1950, pp. 662-663, 666-667, 114-115, 1116-1117.

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