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Additional resources for Encyclopedia of Electrochemistry. Corrosion and Oxide Films
Example text
The current Solution potential E [V] SCE Fe Pt Measured potential gradient vs SCE Distance Fig. 15 Potential distribution between coupled Fe and Pt electrodes. 4 E [V] Fig. 16 Influence of ohmic potential drop on galvanic couple. at the coupled potentials is the galvanic current, and is less than for the case in which R = 0. The existence of an ohmic potential drop in the solution decreases the effect of galvanic corrosion. In the limiting case, when the ohmic resistance becomes sufficiently high, the system behaves as if the electrodes were not coupled at all.
3(E − Ecorr ) |bc | (41) Equation (41) is identical in form to Eqs. (18 and 24). The curve is centered around Ecorr rather than E rev , and the current density at zero ‘‘overpotential’’ is icorr instead of i0 . This expression, along with the theory for mixed potentials, was derived by Wagner and Traud, and therefore will be referred to as the Wagner–Traud equation. 2 on experimental techniques, the Wagner–Traud equation is used in software analysis packages that accompany modern computer-controlled potentiostats.
The rate of any reaction can be determined from the intersection of the couple potential coordinate and the given Tafel line. It is seen that iN−M , the corrosion rate of the more active metal N when contacted to the more noble metal M, is higher than the corrosion rate of N in the uncoupled state, icorr,N . Conversely, the corrosion rate of M is lower when coupled to N (iM−N ) than in the uncoupled state. The rate of the cathodic reaction, hydrogen evolution, increases on M (from icorr,M to iH2 /H+ on M ) and decreases on N (from icorr,N to iH2 /H+ on N ) when coupled, compared to the uncoupled state, which follows from the respective changes in potential from the corrosion potentials to the couple potential.
Encyclopedia of Electrochemistry. Corrosion and Oxide Films by unknown author
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