Method for removing cobalt-containing deposits from surfaces
AssigneeHalliburton Company
InventorJohn M. Wilson
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Abstract
By this invention there is provided a method for dissolving cobalt (II) and cobalt (III) compounds by contacting said compounds with an aqueous acidic solution comprising a compound containing a radical selected from the group consisting of cyano, cyanato, thiocyanato, ferricyano and mixtures thereof.
Claims25
A method of removing cobalt-containing deposits from surfaces comprising the step of contacting said deposits with a deposit removing composition for a period of time sufficient for said deposits to be dissolved therein, said composition being comprised of an aqueous acidic solution of a water soluble acid and a water soluble salt, the anionic portion of said salt being selected from the group consisting of cyano, thiocyanato, ferricyano, cyanato and mixtures thereof.
A method of removing deposits of cobalt compounds from the exterior surfaces of cobalt-cemented tungsten carbide objects comprising the steps of:
- contacting said deposits with a composition capable of rapidly dissolving said deposits for a period of time sufficient for said deposits to be dissolved therein, said composition being comprised of an aqueous acidic solution of a water soluble acid and a water soluble salt, the anionic portion of said salt being selected from the group consisting of thiocyanato, ferricyano, cyano, cyanato and mixtures thereof;
- contacting said surfaces with an aqueous solution containing a base to thereby neutralize said composition remaining on said surfaces.
A composition for dissolving cobalt (II or III) compounds comprising an aqueous acidic solution of a water soluble acid and a water soluble thiocyanate salt.
Dependencies are inferred from the claim text.