Abstract
The active dissolution and passivation of Fe-Cr alloys are analyzed with the use of concepts of the appearance, operation, and blockade of active dissolution sites on the actual metal surface. General regularities of the effect of chromium on the rate of the anodic process at the change in the alloy composition and electrode potential are considered. The less noble, but easily passivable chromium component provides a dual effect on the anodic behavior of the binary alloys; it stimulates the anodic reaction at the low content in the alloy and suppresses the process at the high content. The principally different electrochemical properties of the alloy components result in the step-by-step passivation of the alloy with an increase in the potential, which is reflected by regular breaks in perfect anodic curves.
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Original Russian Text © V.P. Razygraev, M.V. Lebedeva, published in Korroziya: Materialy, Zashchita, 2009, No. 8, pp. 5–11.
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Razygraev, V.P., Lebedeva, M.V. Relation between individual properties of alloy components and anodic behavior of multicomponent alloys in acidic environments: I. Active dissolution and passivation of Fe-Cr alloys in sulfuric acid solutions. Prot Met Phys Chem Surf 46, 748–754 (2010). https://doi.org/10.1134/S2070205110070026
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DOI: https://doi.org/10.1134/S2070205110070026