Local electrochemical properties of laser beam‐welded high‐strength Al–Zn–Mg–Cu alloys

Wloka, J.; Hack, T.; Virtanen, Sannakaisa

doi:10.1002/maco.200704081

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…The macro-scale pitting potentials are shifted to at least 700 mV lower values compared to micro-scale pitting potentials. This potential shift was already evidenced for a 2024 alloy in T3 temper state [33] and for Al-Zn-Mg-Cu alloys [34]. Evidently, this is because of the number of pit initiating constituent particles present in the testing area.…”

Section: Pitting Corrosion Potential Derived From Macro-and Micro-elementioning

confidence: 60%

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Nickel

Dietrich

Mehner

et al. 2015

Metals

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Abstract:The corrosion susceptibility of an age-hardened aluminum alloy in different processing conditions, especially after a single pass of equal-channel angular pressing (ECAP), is examined. The main question addressed is how corrosive attack is changed by strain localization. For that purpose, an AlMgSi0.5 alloy with a strain localized microstructure containing alternating shear bands was subjected to potentiodynamic polarization on a macro-scale and micro-scale using the micro-capillary technique. Pitting potentials and the corrosion appearance (pit depth, corroded area fractions and volumes) are discussed with respect to microstructural evolution due to casting, extrusion and ECAP. Size, shape and orientation of grains, constituent particle fragmentation, cell size and microstrain were analyzed. Stable pitting of shear bands results in less positive potentials compared to adjacent microstructure. More pits emerge in the shear bands, but the pit depth is reduced significantly. This is attributed to higher microstrains influencing the stability of the passivation layer and the reduced size of grains and constituent particles. The size of the crystallographic pits is associated with the deformation-induced cell size of the aluminum alloy. OPEN ACCESSMetals 2015, 5 173

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Section: Pitting Corrosion Potential Derived From Macro-and Micro-elementioning

confidence: 60%

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Nickel

Dietrich

Mehner

et al. 2015

Metals

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“…Several investigations have been carried out to study the corrosion behavior of Mg-based alloys in aggressive solutions. It was generally supposed that the corrosion resistance of Mg alloys depended on many factors: environment, alloy composition and microstructure, and properties of the film developed in the medium to which they were exposed [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of 3C magnesium alloys in simulated sweat solution

Zhang

Tao

2011

Materials & Corrosion

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AZ series Mg alloys AZ31, AZ61, and AZ80 are widely applied in 3C (computer, communication, and consumer electronic) industry. Their corrosion characters in simulated sweat solution have been investigated by electrochemical technology, surface analysis, and pH measurements. Electrochemical test results showed that the three magnesium alloys revealed different corrosion resistance (R t ) in simulated sweat solution, R t(AZ31) < R t(AZ61) < R t(AZ80) . Three major components of simulated sweat solution played different roles during corrosion processes. Lactic acid was a kind of strong erosive medium for the magnesium alloys, and NaCl can induce pitting corrosion on alloys surface, while urea acted as a corrosion inhibitor. The corroded surface morphology of the three magnesium alloys was observed using scanning electron microscopy (SEM) and corrosion products were analyzed by X-ray diffraction (XRD). Result of pH measurement tests showed that there were differences in climbing speed and final values of pH for the three magnesium alloys in simulated sweat solution.

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