Experimental and boundary element method study on the effect of stress on the polarization curve of cast aluminum alloy in sodium chloride solution

Kuwazuru, Osamu; Ode, Kazuhiro; Yamada, Makoto; Kassab, Alain J.; Divo, Eduardo

doi:10.1016/j.corsci.2017.12.019

Cited by 14 publications

(6 citation statements)

References 19 publications

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“…where B, C, D, E 0 and E 1 are the fitting parameters [9]. This curve is used as the polarization curve of intact portion of the material surface.…”

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

“…Then, many microcells are constituted and the micro-current flows from damaged portions to intact portions keeping the self-equilibrium, which means that the average current density is null. In this condition, the potential distribution is almost uniform [9]. Hence, by assuming the uniform potential and null average current density, the potential and local current density on the damaged portions can be calculated as follows.…”

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

“…The potential of damaged portions E dam is almost the same as E int [9]. Thus, several sets of E dam and I dam corresponding to selected stress values were calculated and plotted as red open circles in Fig.…”

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

“…5 was evaluated by BEM. The number and size of microcells does not affect the average potential and average current density [9]; therefore, this single unit cell analysis is justified. The intact portion of the passive film and the damaged portion have the polarization curves obtained in eqn (13) and Table 1, respectively.…”

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

See 3 more Smart Citations

Pitting corrosion analysis of stainless steel by boundary element method with strain-dependent polarization curve

Kuwazuru¹,

Kawakami²,

Miura³

et al. 2021

Int. J. CMEM

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This study aims at evaluating the corrosion rate at the first stage of stress corrosion cracking by a numerical simulation. The stress corrosion cracking starts with a pitting corrosion which appears from a damaged portion of passive film induced by plastic deformation. From micromechanical standpoint, the stress and strain are concentrated around the grain boundaries due to the heterogeneity of microstructures; therefore, the plastic slip occurs mainly around the grain boundaries and generates a fresh surface without passive film. This produces a microcell and affects the macroscopic polarization curve. We obtained this polarization curve of stainless steel from the open-circuit tensile tests associated with the microscopic electrostatic simulations. Moreover, this paper shows the two-dimensional formulation for coupling analysis of elastic stress and electrolytic potential. Both fields are solved by the boundary element method with the discontinuous quadratic element. The strain-dependent polarization curve is used as a nonlinear boundary condition of the potential problem. First, the elastic problem is solved to obtain the surface strain which governs the polarization curve on the surface. Next, the potential problem is solved to obtain the current density on the surface which determines the corrosion rate. Since each node has two corrosion rates in different directions coming from the neighbouring elements, we average these two rates and directions, so as to conserve the volumetric reduction rate unchanged. After moving the nodes as a result of corrosion during the time step, we return to the stress analysis and iterate this procedure during the interested period of time. We demonstrate a corrosion pit growth from a small hemi-elliptic surface defect and show the availability of the proposed method.

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“…where B, C, D, E 0 and E 1 are the fitting parameters [9]. This curve is used as the polarization curve of intact portion of the material surface.…”

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

Section: Strain-dependent Polarization Curvementioning

confidence: 99%

See 2 more Smart Citations

Pitting corrosion analysis of stainless steel by boundary element method with strain-dependent polarization curve

Kuwazuru¹,

Kawakami²,

Miura³

et al. 2021

Int. J. CMEM

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the electrochemistry theory, corrosion resistance of the hot-rolled Fe 85 Ga 15 alloy is better than the as-cast Fe 85 Ga 15 alloy. Previous studies have shown that crystal defects can affect material corrosion [40][41][42]. Grain size has also proven to be a key factor that affects the corrosion property.…”

Section: Influence Of Polarization Potential On Constant Load Sccmentioning

confidence: 99%

A Comparison of SCC Behaviors for Two States of Fe85Ga15 Alloys in a 3.5 wt % NaCl Solution

Zhao

Zhang

et al. 2020

Materials

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The new magnetostrictive material Fe-Ga alloy has drawn considerable attention due to its excellent performance. The microstructure of the Fe-Ga alloy, which varies with the state of preparation or processing, not only affects the magnetostriction but also the mechanical service stability, i.e., the stress corrosion cracking (SCC) property. In this paper, we report a comparison of the SCC behaviors for two states of Fe85Ga15 alloys by using constant load experiments and the electrochemical method. Results showed that the hot-rolled Fe85Ga15 alloy exhibited better mechanical properties compared to the as-cast Fe85Ga15 alloy. SCC was found in both Fe85Ga15 alloys in a 3.5 wt % NaCl solution, and the as-cast alloy was more sensitive to SCC. The normalized thresholds of SCC for the as-cast and hot-rolled Fe85Ga15 alloys are 0.34 and 0.81, respectively. Furthermore, results also indicated that the SCC mechanism is an anodic dissolution for the Fe85Ga15 alloy.

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SCC evaluation of a 2297 Al-Li alloy rolled plate using the slow-strain rate technique

Zhao

Liu

et al. 2019

Chinese Journal of Aeronautics

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Experimental and boundary element method study on the effect of stress on the polarization curve of cast aluminum alloy in sodium chloride solution

Cited by 14 publications

References 19 publications

Pitting corrosion analysis of stainless steel by boundary element method with strain-dependent polarization curve

Pitting corrosion analysis of stainless steel by boundary element method with strain-dependent polarization curve

A Comparison of SCC Behaviors for Two States of Fe85Ga15 Alloys in a 3.5 wt % NaCl Solution

SCC evaluation of a 2297 Al-Li alloy rolled plate using the slow-strain rate technique

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