Influence of a layer of undissolved cementite on the rate of the CO{sub 2} corrosion of carbon steel
- Elf Equitaine, Pau (France)
- Statoil Research Center, Trondheim (Norway)
- Inst. for Energiteknikk, Kjeller (Norway)
Theoretical models describing the influence of transport phenomena on the protectiveness of corrosion layers are briefly recalled, together with the impossibility of using the standard electrochemical techniques of imposed polarization, such as the plotting of potential-current density curves, in the case of specimens covered by such layers. This has led to the idea of using ``pseudo-polarization`` curves, which simply correspond to the trajectory of the free corrosion point in the traditional Tafel representation. This method suggests that the increase in corrosion rate beneath a layer of undissolved cementite is in fact caused by local acidification of the corrosive medium in the layer, due to exhaustion of the bicarbonate anions which buffer the external medium.
- OSTI ID:
- 70020
- Report Number(s):
- CONF-940222-; TRN: IM9529%%359
- Resource Relation:
- Conference: Corrosion 94: National Association of Corrosion Engineers (NACE) international annual conference, Baltimore, MD (United States), 28 Feb - 4 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of Corrosion/94 conference papers; PB: 5005 p.
- Country of Publication:
- United States
- Language:
- English
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