SYMPOSIA PAPER Published: 01 January 1981
STP28034S

Digital Faradaic Impedance Measurements on Corroding Copper in Acid Solutions

Source

The faradaic impedance of a rotating copper disk has been investigated in oxygenated acid solutions. The impedance measurement system is based on a digital acquisition and analysis of multiple frequency signals. The frequency range investigated was 0.1 to 500 Hz. In sulfuric acid the corrosion involves the peroxide intermediate whose transport behavior strongly influences the impedance results. Peroxide is not important in hydrochloric acid, but the transport of cuprous ions determines the impedance behavior. Measurements at frequencies higher than about 400 Hz in sulfuric acid show a strong frequency dispersion of the capacitance due to a nonuniform current distribution.

Author Information

Smyrl, WH
Sandia Laboratories, Albuquerque, N.M.
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Details
Developed by Committee: G01
Pages: 198–214
DOI: 10.1520/STP28034S
ISBN-EB: 978-0-8031-4795-9
ISBN-13: 978-0-8031-0704-5