Analysis of Metal Corrosion under Conditions of Mechanical Impacts and Aggressive Environments

V. M. Yuzevych$^{1}$, R. M. Dzhala$^{1}$, B. P. Koman$^{2}$

$^{1}$Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5, Naukova Str., 79060 Lviv, Ukraine
$^{2}$Ivan Franko National University of Lviv, 1 Universytetska Str., UA-79000 Lviv, Ukraine

Received: 10.11.2017. Download: PDF

Based on standpoints of the surface physics, fracture mechanics and electrochemistry, a mathematical model of the physical and chemical processes near the crack tip of a metal under mechanical loads in aqueous electrolyte solutions is developed. Calculations of the energy and electrochemical characteristics are performed for the steel 20 in the 3% solution of sodium chloride. Parameters of the Tafel-type relationship between the anode current and the difference of electrode potentials are analysed. Well-known Kaeshe expression for the current density on the juvenile surface of a crack bottom is generalized both by linear approximation of the dependence of corrosion current density on surface energy of plastic deformation of the metal and with accounting for increase of mechanical tensile stress up to yield limit.

Key words: metal, crack, juvenile surface, mechanical tension, electrochemical overpotential, surface energy, corrosive current.



PACS:,, 68.35.Gy, 68.35.Md, 81.40.Np, 81.65.Kn, 82.45.Bb

Citation: V. M. Yuzevych, R. M. Dzhala, and B. P. Koman, Analysis of Metal Corrosion under Conditions of Mechanical Impacts and Aggressive Environments, Metallofiz. Noveishie Tekhnol., 39, No. 12: 1655—1667 (2017)

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