ChemInform Abstract: DEVELOPMENT OF THE THEORY OF ANODIC ACTIVATION OF PASSIVE METALS (REVIEW)

Давыдов, А. Д.; Kamkin, A. N.

doi:10.1002/chin.197846358

Cited by 4 publications

(3 citation statements)

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“…With decreasing θ, the activation potential for the chloride dominating activation potential is shifted to more anodic potentials. The nitrate anions disturb the activation [23]. With respect to the proposed mechanistic model, increasing θ leads to higher current densities at which the change of dominating mechanism occurs due to the transport of chloride anions from the bulk of the electrolyte through the diffusion layer to the steel surface.…”

Section: Influence Of Anion Transport On the Transition From Active Tmentioning

confidence: 93%

External control of anodic dissolution mechanism of 100Cr6 in nitrate/chloride mixed electrolytes

Lesch

Wittstock

Burger

et al. 2011

J. Electrochem. Sci. Eng.

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Section: Influence Of Anion Transport On the Transition From Active Tmentioning

confidence: 93%

External control of anodic dissolution mechanism of 100Cr6 in nitrate/chloride mixed electrolytes

Lesch

Wittstock

Burger

et al. 2011

J. Electrochem. Sci. Eng.

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“…Obviously, when the number of growing pits becomes sufficiently large, the whole process is similar to an intense metal dissolution as if there were one continuous pit. In this case the process follows deterministic laws as those obtained by most workers in this field (16).…”

mentioning

confidence: 85%

Stochastic Approach for Pitting Corrosion Modeling: I . The Case of Quasi‐Hemispherical Pits

Mola

Mellein

Schiapparelli

et al. 1990

J. Electrochem. Soc.

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The present paper is devoted to a first approach to a theoretical model for pitting corrosion, which applies to a process initiated at reacting inclusions in the metal yielding the development of quasi‐hemispherical pits. The model describes the distribution of reacting inclusions, the pit birth, pit death, and pit growth processes, and steady pitting corrosion, so that the gap between stochastic and deterministic aspects of the entire pitting process is covered. The predictions of the theory are compared to experimental data resulting from 316SS specimens in a borate‐phosphate buffer containing sodium chloride. The geometry of pits formed in this system satisfies the hypothesis of the theoretical model. In the present model we consider a stochastic approach for pit growth, and to our knowledge there is no attempt so far to introduce a stochastic description of the pit growth process. The proposed approach to pitting corrosion is determined by a critical condition which is related to a critical volume. The time required to attain the critical condition is given by a random variable, as well as the pit passivation which is given in terms of equivalent stochastic characteristics.

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“…ions released in dissolution of FeCl 3 are depassivators displacing or partially substituting, by the adsorption mechanism, the passivating oxygen in the surface film to form a surface complex [22] capable of subsequently passing into the solution. Also, aggressive ions can directly contact the metal surface as a result of mechanical degradation of the oxide layer [23]. Oxidation of aluminum is accompanied by reduction of proton donors (hydrogen depolarization) and of the oxidant (iron ions).…”

mentioning

confidence: 99%

Pseudo-Topochemical Synthesis of α-Fe in Aqueous Solution Using an Aluminum Matrix

Dresvyannikov

Колпаков

2005

Russ J Gen Chem

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Processes occurring in synthesis of a-Fe from a Fe(III) solution using an aluminum matrix were studied. The reaction kinetics strongly depends on the state of the matrix.Dispersed and ultradispersed iron metal and its alloys are widely used in various branches of science and engineering thanks to their unique magnetic, mechanical, catalytic, and other properties. The properties of these materials largely depend on the procedure of their preparation. It should be noted that the known processes for reduction of Fe(III) from aqueous solutions are very few and often do not ensure high yield of iron metal under normal conditions. Also, it is known that the history of iron metal preparation appreciably affects its physical and chemical properties, which should be taken into account in preparation of materials with preset characteristics.Metal formulations with an aluminum matrix attract much researchers' attention [135]. Thanks to a unique combination of protective properties of surface oxide3hydroxide layers and intrinsic chemical activity, aluminum under definite conditions chemically reacts with the surrounding medium to form compounds exhibiting a series of specific properties [6,7]. According to numerous papers, finely dispersed aluminum powder considerably surpasses compact aluminum in the chemical activity toward water and aqueous solutions of various compounds [8,9]. It is believed [6,8,9] that this is due to the developed surface of the powders, to strongly defective state of the surface oxide3hydroxide films on fine particles, and to strong heat-up of the solid phase in the course of oxidation [9]. These factors can appreciably affect the course and extent of the reaction of finely dispersed and compact aluminum with an aqueous solution containing metal ions. It should be noted, however, that we found no detailed information on the reduction of Fe(III) ions with aluminum in solution. In this connection, it seems important to study how the aluminum matrix affects the redox process involving reduction of Fe(III).Our goal was to elucidate the mechanism of the reaction of compact and dispersed (with different particle size) aluminum with an aqueous solution of Fe(III) chloride and to reveal characteristic kinetic features of separate steps of the process.

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ChemInform Abstract: DEVELOPMENT OF THE THEORY OF ANODIC ACTIVATION OF PASSIVE METALS (REVIEW)

Abstract: Review: Die Zerstörung des passiven Zustandes von Metallen durch aggressive Ionen bei ausreichend hohen Anodenpotentialen, die zu einer intensiven lokalen Auflösung in Mikroabschnitten führt (Lochfraß), ist eine der häufigsten Korrosionsformen.

Cited by 4 publications

References 0 publications

External control of anodic dissolution mechanism of 100Cr6 in nitrate/chloride mixed electrolytes

External control of anodic dissolution mechanism of 100Cr6 in nitrate/chloride mixed electrolytes

Stochastic Approach for Pitting Corrosion Modeling: I . The Case of Quasi‐Hemispherical Pits

Pseudo-Topochemical Synthesis of α-Fe in Aqueous Solution Using an Aluminum Matrix

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