Microtunnelling during localized attack of passive aluminum: The case of salt films vs oxide films☆
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2019, Corrosion ScienceCitation Excerpt :Fig. 4a shows the attacked GB surface in an IGC fissure. The image of the area marked in Fig. 4a is magnified in Fig. 4b, showing the crystallographic-faceted etch surface commonly observed in localized corrosion forms of aluminium, such as tunnelling and pitting [17–19], due to significant acidification and Cl- enrichment of the anolyte. The etching probably occurred after the fissure was formed.
Grain distinct stratified nanolayers in aluminium alloys
2017, Materials Chemistry and PhysicsCitation Excerpt :Tunnelling plays a prominent role in the pit growth kinetics of aluminium irrespective of the environmental conditions [3]. Baumgartner and Kaesche [3–5] in their works, theorised that macroscopic pitting depends on the distribution of tunnel initiation sites. However, what has not been reported is the fact that there are tunnel initiation sites in every grain of a polycrystalline aluminium or aluminium alloy and the tunnel initiation sites (which are aligned in the <100> directions) are present in each nanolayer.
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2014, Corrosion ScienceCitation Excerpt :Different studies have suggested that the tunnel growth is depended on mass transport [5–8], ohmic resistance [9,10], or mixed mass transport and ohmic control [3,11–16]. And the previous experimental results demonstrated that both electrical variables (potential, current density and current waveform) and chemical parameters (solution composition, temperature and pressure) can control the growth rate and length of etch tunnel [8,17–25]. It is universally recognised that hydrogen gas can evolve inside the etch tunnel during the growth process.
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2012, Corrosion ScienceCitation Excerpt :In Fig. 7(d), it can be seen that small pits initiated at small particles where copper was preferentially detected. According to the literature [48–50], structural etching proceeds at high anodic potentials in sites of the matrix containing surface defects such as kink steps, dislocations, and vacancies. Observation of structural etching is also indicative of presence of HCl, which forms as a result of acidification in the pits.
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This paper was given at the German-American Colloquium on Electrochemical Passivation, which was held in Nümbrecht in the Federal Republic of Germany from 8–13 September 1987.