Method for determining the faradaic impedance of an electrode reaction: Application to metal corrosion rate measurements

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3293582· OSTI ID:6495266

Berthier, F ^[1]; Diard, J P; Le Gorrec, B; Montella, C ^[2]

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1. Univ. de Paris 11, Orsay (France). Lab. de Metallurgie Physique
2. Domaine Univ., Saint Martin d'Heres (France)

A method was developed to determine the faradaic impedance (Z[sub t]) of an electrode reaction on the basis of a measurement of the electrode impedance (Z). Neither the reaction mechanism nor the equivalent electric circuit needed to be known. Z[sub f] was determined by a method based on determination of the minimum of the length of the electrode admittance diagram minus the capacitive term. A similar method applied to Z[sub f] could be used to obtain the electronic transfer and electrode polarization resistances (R[sub t] and R[sub p], respectively) automatically and thus the corrosion rate for measurements carried out at the corrosion potential (E[sub corr]). The proposed method was applied to zinc (Zn) corroding in a 3% sodium chloride (NaCl) solution.

• OSTI ID: 6495266
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 51:2; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
CHARGE TRANSPORT
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CORROSION
CURRENT DENSITY
ELECTRIC IMPEDANCE
ELECTROCHEMICAL CORROSION
ELEMENTS
IMPEDANCE
KINETICS
MEASURING METHODS
METALS
REACTION KINETICS
REDOX REACTIONS
ZINC