Effect of pH on Stress Corrosion Cracking of 7050-T7451 Aluminum Alloy in 3.5 wt% NaCl Solution

Tsai, W.-T.; Duh, J.-B.; Yeh, J-J.; Lee, J-T.; Chang, Yaoguang

doi:10.5006/1.3585130

Cited by 18 publications

(7 citation statements)

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“…The SCC susceptibility would be increased when the stress corrosion testing environment became more corrosive, as previously reported by some researchers. [26,27,28] Therefore, in the same microstructure, a more serious corrosion reaction due to superplastic forming means that more atomic hydrogen would be generated, then transported and stored up at the intersection of dislocation and grain boundary by mobile dislocations. [9] It indicates that increasing the extent of superplastic deformation will increase the SCC susceptibility under the same postforming tempered condition.…”

Section: Discussionmentioning

confidence: 99%

Stress corrosion cracking of superplastically formed 7475 aluminum alloy

Tsai

Chang

Chuang

1997

Metall Mater Trans A

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The effects of biaxial superplastic deformation and postforming heat treatment upon the stress corrosion cracking (SCC) of a fine-grained 7475Al alloy plate have been investigated. For all postforming tempered conditions, increasing the extent of superplastic deformation, which created more cavitations, would decrease the mechanical properties, the SCC resistance, and the corrosion resistance. The influence of cavitation on the decay of elongation of the superplastically formed workpieces is larger than that on the decay of its strength. Post-forming tempered by retrogression and reaging (RRA) treatment could effectively improve the SCC resistance of workpieces in postforming T6 temper while not sacrificing the strength. However, the benefit of improving the SCC resistance by means of the postforming RRA temper was decreased with increasing the extent of superplastic deformation, because the SCC susceptibility increased as the extent of superplastic deformation increased for each postforming tempered condition. The cavitation led to more anodic corrosion potential and pitting potential and to an increase in both corrosion current density and passive current density, which would increase the SCC susceptibility.

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Section: Discussionmentioning

confidence: 99%

Stress corrosion cracking of superplastically formed 7475 aluminum alloy

Tsai

Chang

Chuang

1997

Metall Mater Trans A

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“…Localized corrosion such as pitting [1,2], crevice corrosion [2,3], and stress corrosion cracking [4,5] of metals depends much on the pH of the environment within the occluded cells present in them. The cations dissolved into the occluded environments establish the pH of the occluded cells [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of buffer chemistries on the electrochemical corrosion behaviour of three metallic materials

Palli

Raja

2020

Corrosion Engineering, Science and Technology

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The influence of chemistry apart from the pH of buffers on the electrochemical corrosion behaviours of mild steel (MS) and 7004 aluminium alloy (AA) was studied using acetate, citrate, and citratephosphate buffers having an identical pH of 4. While the buffers showed marginal to insignificant variations in their anodic and cathodic kinetics on Pt, the cathodic current density for MS and AA in these buffers increased in the order citrate < citrate-phosphate < acetate. As for the anodic current density, it increased in the order: acetate < citrate < citrate-phosphate for MS and citrate < acetate < citrate-phosphate for AA. Such variations were explained based on the direct reduction of the weak acids and the complexing behaviour of the metal ions with the buffer species. The study suggests the importance of considering buffer chemistries while studying the influence of pH on electrochemical corrosion including localized corrosion behaviour of metals.

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“…Besides, fluctuating tensile stress during the application process can lead to the variation of strain rate. Solution pH or strain rate can notably affect the SCC process of 7xxx series alloys [23,24]. However, it is still unknown whether Sc addition can enhance the SCC resistance of 7xxx series alloys under different environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Scandium Addition on Stress Corrosion Cracking Susceptibility of Al-Zn-Mg Alloy in Different Corrosive Environments

Jiang

Yan

et al. 2018

Metals

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Stress corrosion cracking (SCC) susceptibilities of Al-Zn-Mg alloys without and with Scandium addition were evaluated in 3.5% NaCl solution at different pH and different strain rate, using slow strain rate test technique. The results indicate that Sc addition reduces grain size and width of precipitation free zones, and transforms grain boundary precipitates from continuous distribution into interrupted distribution by inhibiting recrystallization. In solution at pH 1, pH 3 and pH 7, Sc addition reduces the degree of localized corrosion of alloy surface and SCC susceptibility of Al-Zn-Mg alloy. However, in solution at pH 10 and pH 12, grain refinement significantly promotes the diffusion of hydrogen atoms into matrix, thus Sc addition increases SCC susceptibility of Al-Zn-Mg alloy. Under different strain rate conditions, Sc addition can all reduce SCC susceptibility of Al-Zn-Mg alloy in solution at pH 1, pH 3 and pH 7, and can all increase SCC susceptibility of Al-Zn-Mg alloy in solution at pH 10 and pH 12. As a result, Sc modified Al-Zn-Mg alloy in practical applications should be avoided in alkaline environments.

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Effect of pH on Stress Corrosion Cracking of 7050-T7451 Aluminum Alloy in 3.5 wt% NaCl Solution

Cited by 18 publications

References 0 publications

Stress corrosion cracking of superplastically formed 7475 aluminum alloy

Stress corrosion cracking of superplastically formed 7475 aluminum alloy

Effect of buffer chemistries on the electrochemical corrosion behaviour of three metallic materials

Influence of Scandium Addition on Stress Corrosion Cracking Susceptibility of Al-Zn-Mg Alloy in Different Corrosive Environments

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