Corrosion resistance of a two-stage stress-aged Al–Cu–Mg alloy: Effects of external stress

Lin, Yuhong; Guan, Lan; Chen, Mingsong; Zhang, Jinlong; Chen, Zhiguo; Jiang, Yu-Qiang; Li, Jia

doi:10.1016/j.jallcom.2015.11.173

Cited by 34 publications

(13 citation statements)

References 47 publications

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“…The effect of grain size (D) can be better visualized by the Hall-Petch plot as can be obtained. Some representative polarization curves are shown in figure 3(a), where the corrosion current density (i corr ) was obtained by the Tafel extrapolation method [21][22][23][24][25][26][27][28] according to the anodic and cathodic extrapolation lines shown in figure 3(a). The results are summarized in figure 3(b), where by grain refinement, it can be seen that i corr firstly increased slowly but increased rapidly afterwards.…”

Section: Resultsmentioning

confidence: 99%

Effect of grain size on the corrosion resistance of low carbon steel

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

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Systematic works on the effect of grain size on the corrosion resistance of low carbon steel are scant. In the present work, a spectrum of grain sizes was obtained by simple heat treatment routes in a typical low-carbon steel. It was revealed that two distinct stages for the dependency of corrosion current density (i corr ) on the grain size exist. Above a limiting average grain size of ∼22 μm, i corr decreased slowly with increasing grain size. However, below this limiting value, i corr increased rapidly, which was related to the increased density of grain boundaries as interpreted by theoretical calculation of number of grains per unit area. Conclusively, a grain size of ∼22 μm (ASTM grain-size number of 8) was considered to be an optimum value according to the mechanical and corrosion standpoints.

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Section: Resultsmentioning

confidence: 99%

Effect of grain size on the corrosion resistance of low carbon steel

Soleimani

Mirzadeh

Dehghanian

2020

Mater. Res. Express

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“…The repassivation processes depend on competitive (electro)chemical and metallurgical events in the interfacial reactions (Scully, 1971;Okada, 1984). Studies of Al and Al alloys in chloride-containing solutions have shown that the repassivation response from single-cycle anodic polarization is sensitive to such competitive processes (Yasuda et al, 1990;Pride et al, 1994;Wall & Stoner, 1997;Zhang & Frankel, 2003;Meng & Frankel, 2004;Little et al, 2007;Moore et al, 2008;Jilani et al, 2014;Trueba & Trasatti, 2015;Abreu et al, 2016;Lin et al, 2016). In addition to time effects, material composition and microstructure, test environment, electrochemical condition and mechanical stress determine the occurrence of a potential drop at high currents during the potential scan into the negative direction.…”

Section: Introductionmentioning

confidence: 99%

“…This feature as linked to the electrochemistry of a copper depleted region along microstructural boundaries of high strength 2xxx series alloys has been suggested (Wall & Stoner, 1997;Little et al, 2007). Few studies report on the effect of the mechanical state on the response to repassivation (Liu & Frankel, 2006;Jilani et al, 2014;Abreu et al, 2016;Lin et al 2016). Fine grained Al (99.9%) has shown steeper potential gradients at the transition with accumulated strains by pressing (Jilani et al, 2014), whereas the opposite has been found for Al 2024-T3 subjected to residual elastic compressive stress after uniaxial tensile load (Liu & Frankel, 2006).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending

et al. 2017

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This work reports an electrochemical investigation of corrosion and repassivation in NaCl solutions of structural Al 7075-T6 and Al 2024-T3 as a function of permanent load in bending by means of single-cycle anodic polarization. Experimental variables other than the load level were the extent of corrosion, chloride ion concentration and initial pH of the test solution, in addition to the pre-exposure in the aggressive environment and of the viscosity of the test solution for Al 7075-T6. The susceptibility to local stress during corrosion and repassivation depends on the alloy microstructure and corrosion mechanisms. In the case of Al 2024-T3, the mechanical activation is driven by cathodically controlled dissolution of this alloy at open circuit in concentrated NaCl, being indicative of a chemomechanical effect. Conversely, for Al 7075-T6, the effect of applied load is better discerned from the repassivation response. Film rupture/formation sequence and related interfacial (electro)chemical processes determine the stress-enhanced metastable repassivation of this alloy

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“…Single cycle anodic polarization has been widely used for investigating the repassivation behaviour of Al and alloys in chloride containing solutions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A potential drop at high currents during the potential scan into the negative direction has been frequently detected [1][2][3][4][6][7][8][9][10][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The response to repassivation in aftermath of microstructural effects (e.g. impurities, precipitate phase, solute-depleted region) [6,10,12] and of mechanical deformation (residual [13] and applied [9,16,17] stresses) is not fully clear. The not distinguishable inflection detected for commercially pure Al 1050 exhibiting either etched or crystallographic pits [10] suggests that the presence of a salt layer in mass-transport limited repassivation is not mandatory.…”

Section: Introductionmentioning

confidence: 99%

The repassivation response from single cycle anodic polarization: The case study of a sensitized Al-Mg alloy

Trueba

Trasatti

2018

Electrochimica Acta

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The repassivation behaviour of artificially aged 5083-H111 Al-Mg alloy in near neutral NaCl solutions was investigated by means of single cycle anodic polarization. Artificial aging was carried out at 150°C during different times up to 360 h. The characterization of the microstructure and composition by XRD, SEM/EDS and metallographic analyses indicated most favoured grain-boundary β(Al 3 Mg 2) phase precipitation for 168 h of isothermal treatment time. Nitric acid mass loss test (NAMLT) and microhardness measurements indicated the highest degree of sensitization (DoS) and developed strength for 168 h as well. For all the aging conditions, the potential drop at high currents during the reverse scan of the cyclic polarization was detected at the pit transition potential E ptp with similar but higher values than the corrosion potential of β phase (E corr ≈ −900 mV vs SCE). The associated current density i ptp and the steepness of the potential drop increase as the amount and contiguity of β phase precipitates along grain boundaries. The onset and sustenance of metastable conditions that limit the simultaneous repassivation of all the corroded surfaces are driven by the anodic dissolution of β(Al 3 Mg 2). Metastable processes that limit the hydration of metal ions while producing high local hydrogen concentration are more likely to involve the formation/decomposition of reactive hydride intermediates. E ptp corresponds to the mixed electrode potential at which both metal dissolution and hydrogen evolution occur beyond some distance into the cavity, while i ptp evaluates the catalytic activity of the corroding surfaces. The effective anodic charge transfer coefficient α eff determined from the steepness of the potential drop estimates the contribution of Cl − electromigration in response to local electrodissolution processes.

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Corrosion resistance of a two-stage stress-aged Al–Cu–Mg alloy: Effects of external stress

Cited by 34 publications

References 47 publications

Effect of grain size on the corrosion resistance of low carbon steel

Effect of grain size on the corrosion resistance of low carbon steel

Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending

The repassivation response from single cycle anodic polarization: The case study of a sensitized Al-Mg alloy

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