Growth kinetics and passive behavior of the native oxide film on additively manufactured AlSi10Mg versus the conventional cast alloy

Revilla, Reynier I.; Terryn, Herman; Graeve, Iris De

doi:10.1016/j.corsci.2022.110352

Cited by 3 publications

(3 citation statements)

References 43 publications

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“…Previous studies on Al and Al-Si alloy showed that relatively high CPD variations with time (of more than 220 mV and 170 mV respectively for Al and Al-Si alloy) are obtained while measuring on freshly scratched surfaces. 79,80 These variations of the CPD values were due to the (re)-growth of the native oxide on the damaged section. Most CPD variations were observed within the first 20 min for pure Al and within the first 60 min for Al-Si alloy.…”

Section: Factors That Can Compromise the Validity Of Skpfm Measurementsmentioning

confidence: 99%

“…However, even after 2 h (for the case of pure Al) and 25 h (for the Al-Si alloy), considerable changes were detected in the measured CPD values. 79,80 Therefore, to avoid measuring on a non-stationary surface oxide, a waiting time is recommended after sample polishing/etching or after any other surface treatment that can remove or damage the surface oxide. This should allow the growth and stabilization of the surface oxides.…”

Section: Factors That Can Compromise the Validity Of Skpfm Measurementsmentioning

confidence: 99%

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Methods—On the Application of Ambient Scanning Kelvin Probe Force Microscopy to Understand Micro-Galvanic Corrosion Phenomena: Interpretation and Challenges

Revilla¹

2023

J. Electrochem. Soc.

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The capabilities of scanning Kelvin probe force microscopy (SKPFM) to directly measure local Volta potential differences with relatively high spatial resolution has made it a very popular technique to assess the relative nobility of intermetallic phases and therefore to understand corrosion susceptibility and microgalvanic corrosion activity in several alloys. However, the direct correlation between galvanic corrosion activity and Volta potential differences measured in air is not straightforward. Several factors, which can easily go unnoticed, can directly affect the potential values measured by SKPFM, hence compromising their validity and relevance in explaining certain galvanic corrosion activities. Several recent studies presenting conflicting/varied results or failing to properly interpret/discuss the obtained data can be found. This work discusses specific factors that can compromise the validity of SKPFM measurements and/or the understanding acquired from them. It presents a discussion on the SKPFM working principle, the basics of galvanic corrosion, and the relevant terminology around these topics, emphasising the possible correlations between them, with the intention of increasing comprehension of SKPFM-based micro-galvanic corrosion studies. A summary of best recommended practices is presented, aiming at standardizing the use of the SKPFM technique and the representation of the data, and to ensure consistency of the results.

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Section: Factors That Can Compromise the Validity Of Skpfm Measurementsmentioning

confidence: 99%

Section: Factors That Can Compromise the Validity Of Skpfm Measurementsmentioning

confidence: 99%

Methods—On the Application of Ambient Scanning Kelvin Probe Force Microscopy to Understand Micro-Galvanic Corrosion Phenomena: Interpretation and Challenges

Revilla¹

2023

J. Electrochem. Soc.

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“…These large connected silicon precipitates, which are present near or at the melt pool boundary (as shown in Figure 3a-d), decelerated the corrosion, leading to a lower corrosion rate compared with that of the as-cast AlSi10Mg alloy. The microstructure has a great influence on the corrosion resistance of the SLMed AlSi10Mg alloy, and by tailoring the microstructure, it is possible to increase the corrosion resistance in this alloy [35]. The EIS data analysis showed a higher (R f + R c ) value for the SLMed AlSi10Mg alloys compared with the as-cast alloy (as shown in Table 2), which provide a less defective, more compact and more protective oxide layer on AM samples and indicates a lower corrosion rate.…”

Section: Post Corrosion Morphologymentioning

confidence: 99%

Improved Corrosion Resistance Behaviour of AlSi10Mg Alloy due to Selective Laser Melting

2023

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The corrosion behaviour of AlSi10Mg alloy produced by selective laser melting (SLM) under two different atmospheres, namely argon and nitrogen, was compared to that of AlSi10Mg alloy that had been cast. The present study demonstrates the systematic electrochemical behaviour of selective-laser-melted (SLMed) AlSi10Mg. Potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical behaviour, illustrating the degrading features of SLMed AlSi10Mg alloy in 0.1 M NaCl solution. The corrosion resistance of AlSi10Mg produced using selective laser melting was found to be 2–3 times greater than that of AlSi10Mg that had been cast. The degradation behaviour was also explained by SEM analysis of the corroded samples of SLMed AlSi10Mg and as-cast AlSi10Mg alloy. It may be deduced that the better corrosion resistance of AlSi10Mg produced through selective laser melting is due to the fast cooling rate associated with the solidification of AlSi10Mg alloy fabricated through selective laser melting, compared with the slow cooling rate associated with the solidification of AlSi10Mg produced by casting.

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Effect of Direct Aging on Corrosion Behavior of AlSi10Mg Alloy Fabricated by Laser Powder Bed Fusion

Zhang,

Zhao,

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Growth kinetics and passive behavior of the native oxide film on additively manufactured AlSi10Mg versus the conventional cast alloy

Cited by 3 publications

References 43 publications

Methods—On the Application of Ambient Scanning Kelvin Probe Force Microscopy to Understand Micro-Galvanic Corrosion Phenomena: Interpretation and Challenges

Methods—On the Application of Ambient Scanning Kelvin Probe Force Microscopy to Understand Micro-Galvanic Corrosion Phenomena: Interpretation and Challenges

Improved Corrosion Resistance Behaviour of AlSi10Mg Alloy due to Selective Laser Melting

Effect of Direct Aging on Corrosion Behavior of AlSi10Mg Alloy Fabricated by Laser Powder Bed Fusion

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