Electrochemistry and Corrosion Science by Nestor Perez

Author:Nestor Perez
Language: eng
Format: epub, pdf
Publisher: Springer International Publishing, Cham

(7.32)

Substituting Eq. (7.26) into (7.32) yields

(7.33)

If

(7.34)

(7.35)

then Eq. (7.33) becomes

(7.36)

where  rad.

Since the overpotential η > 0 for anodic polarization, the profile for the rate of oxide film formation, Eq. (7.36), is theoretically shown in Fig. 7.19.

Fig. 7.19Theoretical profile for the rate of oxide film formation

The thermodynamics of passivity together with the Nernst equation can be generalized in simple reaction steps for the formation of an oxide film (MO). Hence: Metal reduction

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