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Selective removal of material using self-initiated galvanic activity in electrolytic bath

Image Number 7 for United States Patent #6007695.

Material of a given chemical type is selectively electrochemically removed from a structure by subjecting portions of the structure to an electrolytic bath. The characteristics of certain parts of the structure are chosen to have electrochemical reduction half-cell potentials that enable removal of the undesired material to be achieved in the bath without applying external potential to any part of the structure. The electrolytic bath can be implemented with liquid that is inherently corrosive to, or inherently benign to, material of the chemical type being selectively removed.

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