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Electrochemical Thermodynamics and Kinetics and Their Application to the Study of Stress-Corrosion Cracking

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Chemistry and Physics of Fracture

Part of the book series: NATO ASI Series ((NSSE,volume 130))

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Abstract

After a short review of some fundamental concepts related to electro-chemical thermodynamics and kinetics, a statement is made on the application of these concepts to the study of stress-corrosion cracking (SCC).

The dangerous electrode potential range where stress corrosion cracking may occur in a given solution may often be predicted by superimposing a polarization curve determined in the bulk of the solution and polarization curves determined in the solution existing inside the cracks. Above this potential range SCC may stop due to passivation of the cracks; below this potential range, SCC may stop due to immunity.

Solutions similar to those existing inside cracks, which are often “occluded corrosion cells” (OCC), may be prepared artificially, in any quantity desirable for chemical and electrochemical studies, by simply dissolving in oxygen-free water, and in the presence of the metal or alloy in powder- or shavings-form, increasing quantities, up to saturation, of the less soluble salt likely to be formed inside the crack; for instance, FeCl2.4H20 in the case of non-alloyed steel in the presence of chloride.

Examples of the prediction of such SCC conditions are given for a non-alloyed steel and for a 12% Cr chromium steel.

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© 1987 Martinus Nijhoff Publishers, Dordrecht

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Pourbaix, M. (1987). Electrochemical Thermodynamics and Kinetics and Their Application to the Study of Stress-Corrosion Cracking. In: Latanision, R.M., Jones, R.H. (eds) Chemistry and Physics of Fracture. NATO ASI Series, vol 130. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3665-2_16

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  • DOI: https://doi.org/10.1007/978-94-009-3665-2_16

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-8140-5

  • Online ISBN: 978-94-009-3665-2

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