Process for reducing the passive layer from the surface of a metal
AssigneeCanadus Technologies LLC
InventorPeter Morton
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Abstract
The present invention is directed to a process for reducing the passive layer on a metal. The process includes reacting a treatment composition having a non-metallic compound with metal ions in the passive layer of a metal, thereby forming an organometallic complex precipitate, and removing the organometallic complex precipitate. In one embodiment the non-metallic compound is a thiuram. In another embodiment, the treatment composition further includes a non-metallic compound that is a dithiocarbamate.
Claims20
A process for reducing the passive layer on the surface of a metal, the process comprising:
- reacting a monomeric treatment composition comprising a non-metallic compound, which comprises thiuram, with metal ions in the passive layer of a metal, thereby forming an organometallic complex precipitate;
- and
- removing the organometallic complex precipitate from the surface of the metal.
A process for reducing the passive layer on the surface of a metal in situ, the process comprising:
- reacting, in an aqueous solution having a wetting agent, a treatment composition comprising a monomeric non-metallic compound, which comprises thiuram, with metal ions in the passive layer of a metal, thereby forming an organometallic complex precipitate;
- and
- removing the organometallic complex precipitate from the surface of the metal.
Dependencies are inferred from the claim text.