Effect of the strain sign in corrosion under stress

Русанов, А. И.; Uriev, N. B.; Eryukin, P. V.; Мовчан, Т. Г.; Esipova, N. E.

doi:10.1070/mc2004v014n02abeh001875

Cited by 18 publications

(11 citation statements)

References 2 publications

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“…The data only show that the dissolution rate is decreasing slightly under compression compared to that under zero stress. Several other studies [20,21] on localized aqueous corrosion indicate that tensile stresses accentuates corrosion rate, but the results are inconclusive.…”

Section: Anodic Dissolutionmentioning

confidence: 73%

Applied Stress Affecting the Environmentally Assisted Cracking

Vasudevan

2013

Metall Mater Trans A

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Stress corrosion cracking (SCC) is affected by the mode of applied stress, i.e., tension, compression, or torsion. The cracking is measured in terms of initiation time to nucleate a crack or time to failure. In a simple uniaxial loading under tension or compression, it is observed that the initiation time can vary in orders of magnitude depending on the alloy and the environment. Fracture can be intergranular or transgranular or mixed mode. Factors that affect SCC are solubility of the metal into surrounding chemical solution, and diffusion rate (like hydrogen into a tensile region) of an aggressive element into the metal and liquid metallic elements in the grain boundaries. Strain hardening exponent that affects the local internal stresses and their gradients can affect the diffusion kinetics. We examine two environments (Ga and 3.5 pct NaCl) for the same alloy 7075-T651, under constant uniaxial tension and compression load. These two cases provide us application to two different governing mechanisms namely liquid metal embrittlement (7075-Ga) and hydrogen-assisted cracking (7075-NaCl). We note that, in spite of the differences in their mechanisms, both systems show similar behavior in the applied K vs crack initiation time plots. One common theme among them is the transport mechanism of a solute element to a tensile-stress region to initiate fracture.

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Section: Anodic Dissolutionmentioning

confidence: 73%

Applied Stress Affecting the Environmentally Assisted Cracking

Vasudevan

2013

Metall Mater Trans A

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“…As a result, the matter flux from the visible unit area becomes larger for the convex side than for the concave one [6].…”

Section: A Weight Methodsmentioning

confidence: 99%

“…A general thermodynamics theory of this phenomenon [4] predicts the mechanochemical strain-sign effect for any solid-state surface chemical reaction. Recently, we reported on the discovery of the strain sign effect at corrosion of bent steel plates [5,6]. The results are represented here in more detail.…”

Section: Introductionmentioning

confidence: 93%

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Mechanochemical Effects in Processes of Corrosion of Metals

et al. 2005

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Mechanochemical effects have been investigated in the processes of corrosion of bent plates of unalloyed and high-alloy steel in aqueous solutions of sulfuric and hydrochloric acids. Special attention was paid to the strain sign effect discovered recently and caused by the existence of a surface stress in solids. The use of the weight method and the hydrogen method of corrosion control has yield well consistent results confirming the existence of the mechanochemical effect of the strain sign even under condition of the starting corrosion cracking. The domination of corrosion on the concave side gives evidence of the negative sign of surface stress at the steel/solution boundary, which can be explained by the formation of the electrical double layer.

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“…The case of a chemical reaction can be considered simi larly. The recent discovery of the mechanochemical effect of the sign of deformation in stress corrosion can be cited as an example [67]. Generally, corrosion can be considered to be a gradual fracture of material in the course of chemical reactions that proceed upon contact of a material with the environment.…”

Section: Mechanochemical Effect Of Dissolutionmentioning

confidence: 99%

The development of the fundamental concepts of surface thermodynamics

Русанов

2012

Colloid J

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Author's results concerning the most fundamental problems of the thermodynamics of surface phenomena are reviewed. The generalized Laplace-Young-Kelvin equation, phase rules, and Gibbs adsorp tion equations are presented. Analogs of Konovalov's laws are describes as applied to surface phenomena. The surface tension dualism, the Gibbs equation for adsorption on solid surfaces, and the phase equilibrium con dition for a soluble nanoparticle are explained. The general mechanochemical approach, chemical affinity tensor, and the discovery of the mechanochemical dissolution effect are characterized. A novel approach to the monolayer state equation is formulated based on an excluded area. The problems of nucleation and the theory of surface separation are reperted.

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Effect of the strain sign in corrosion under stress

Cited by 18 publications

References 2 publications

Applied Stress Affecting the Environmentally Assisted Cracking

Applied Stress Affecting the Environmentally Assisted Cracking

Mechanochemical Effects in Processes of Corrosion of Metals

The development of the fundamental concepts of surface thermodynamics

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