Electrolytic Etching of Dense Tantalum

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Abstract
A practical method of etching dense tantalum for the purpose of magnifying its effective surface area is described. The degree of surface area magnification is related to such parameters as electrolyte composition, anodic current density, temperature, and characteristics of metal specimens to be treated. The decrease in surface area magnification as a function of postetch anodizing voltage apparently signifies the filling in of certain etch pits with tantalum oxide and gives a clue to the size of these pits.

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