Digital faradaic impedance measurements on corroding copper in acid solutions
Conference
·
OSTI ID:5799692
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 nonunifom current distribution.
- Research Organization:
- Sandia Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 5799692
- Report Number(s):
- SAND-78-2222C; CONF-790574-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
COPPER
CORROSION
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
IMPEDANCE
INORGANIC ACIDS
METALS
MIXTURES
MOTION
OXYGEN COMPOUNDS
PEROXIDES
ROTATION
SOLUTIONS
SULFURIC ACID
TRANSITION ELEMENTS
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
COPPER
CORROSION
DISPERSIONS
ELEMENTS
HYDROGEN COMPOUNDS
IMPEDANCE
INORGANIC ACIDS
METALS
MIXTURES
MOTION
OXYGEN COMPOUNDS
PEROXIDES
ROTATION
SOLUTIONS
SULFURIC ACID
TRANSITION ELEMENTS