2015
DOI: 10.1016/j.corsci.2015.05.016
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Some effects of alloy composition on stress corrosion cracking in Al–Zn–Mg–Cu alloys

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Cited by 132 publications
(53 citation statements)
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“…Therefore, the localized alkalization caused by oxygen reduction leads to the breakdown of passive film and the active dissolution of aluminum metal matrix near the cathodic particles; and thus pits initiate and propagate. In this work, the copper and iron rich particles located in coarse grains have a higher copper and iron content, making them more cathodic relative to surrounding matrix, resulting in higher electrochemical activity and faster oxygen reduction rate [7,21,23,37,47,48]. The volt potential difference between cathodic particles and surrounding matrix is also higher in coarse grains than that in fine grains, due to higher content of alloying elements in particles, resulting in higher driving force for pitting initiation and propagation in coarse grains.…”
Section: Effects Of Particles Microchemistry On Pittingmentioning
confidence: 88%
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“…Therefore, the localized alkalization caused by oxygen reduction leads to the breakdown of passive film and the active dissolution of aluminum metal matrix near the cathodic particles; and thus pits initiate and propagate. In this work, the copper and iron rich particles located in coarse grains have a higher copper and iron content, making them more cathodic relative to surrounding matrix, resulting in higher electrochemical activity and faster oxygen reduction rate [7,21,23,37,47,48]. The volt potential difference between cathodic particles and surrounding matrix is also higher in coarse grains than that in fine grains, due to higher content of alloying elements in particles, resulting in higher driving force for pitting initiation and propagation in coarse grains.…”
Section: Effects Of Particles Microchemistry On Pittingmentioning
confidence: 88%
“…The volt potential of copper and iron rich particles which depends on alloying elements content is 200-600 mV higher than that of surrounding matrix [9,11,24,37,72,73]; and thus this type of particle acts as cathode in micro-galvanic cell during corrosion. It is well known that the iron rich particles have higher cathodic activity than pure aluminum [22,74].…”
Section: Effects Of Particles Microchemistry On Pittingmentioning
confidence: 99%
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“…7xxx aluminium alloys are widely applied in aerospace, automatic and rail vehicle, owing to their excellent combination of high specific strength, fatigue resistance, toughness and corrosion resistance . However, when the tensile stress is higher than the stress corrosion cracking (SCC) threshold value, 7xxx aluminium alloys are prone to generate SCC in aggressive environments, such as in Cl − , Br − and I − aqueous solutions and also in moist air . The SCC behaviour of 7xxx aluminium alloys is affected by composition, microstructure, heat treatment, stress, corrosion environment and surface treatment …”
Section: Introductionmentioning
confidence: 99%
“…The electrical conductivity of aluminum alloy may serve as an indicator of stress crack corrosion (SCC) resistance [33]. Figure 8 shows the evolution of electrical conductivity for the retrogressed 7B04-T651 aluminum alloy during various aging treatments at 140 °C.…”
Section: Effects Of Creep Aging On Corrosion Resistancementioning
confidence: 99%