3D study of intermetallics and their effect on the corrosion morphology of rheocast aluminium alloy

Mingo, B.; Arrabal, R.; Pardo, Á.; Matykina, E.; Skeldon, P.

doi:10.1016/j.matchar.2015.12.006

Cited by 44 publications

(33 citation statements)

References 32 publications

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“…Corrosion pits start nearby cathodic Si particles, where the protective layer is diminished and grain boundaries are weaker as well. This results in an agreement with experimental results of Arrabal [4], Mingo [30], Davis [32], and Osório [33]. We suppose that the Fe cathodic particles can have a similar effect and can promote a higher density of corrosion pits in specimens with a bigger content of Fe.…”

Section: Exposure Testsupporting

confidence: 91%

“…The effect of Fe on pitting corrosion of Al-alloys was confirmed earlier by Samuel [13] and Aziz [29]. Mingo et al [30] and Arrabal et al [4] mentioned in their work that in A356 (AlSi7Mg0.3) alloy corrosion initiates at the interface between the α-Al matrix and the Fe-rich intermetallic as a result of microgalvanic corrosion processes. Specimens of the AlZn10Si8Mg alloy were attacked by general irregular corrosion and their surface was covered by grey corrosion products.…”

Section: Exposure Testsupporting

confidence: 53%

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Role of Chemical Composition in Corrosion of Aluminum Alloys

Kuchariková

Liptáková

Tillová

et al. 2018

Metals

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Aluminum alloys are the most important part of all shaped castings manufactured, especially in the aerospace and automotive industries. This work focuses on the corrosion properties of the heat-hardening aluminum alloys commonly used for production of automotive castings AlSi7Mg0.3 and on self-hardening AlZn10Si8Mg. Iron is a common impurity in aluminum cast alloy and its content increases by using secondary aluminum alloys. Therefore, experimental materials were developed, with chemical composition according to standards (primary alloys) and in states with an increasing content of Fe. The experimental aluminum alloys are briefly discussed in terms of their chemical composition, microstructure, mechanical properties and corrosion behavior. Corrosion properties were examined using three types of corrosion tests: exposure test, potentiodynamic tests, and Audi tests. Corrosion characteristics of materials were evaluated using stereo, optical and scanning electron microscopy, energy dispersive X-ray analysis, too. Correlation of pit initiation sites with microstructural features revealed the critical role of iron-rich phases, silicon particles and corresponding alloy matrix.

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Section: Exposure Testsupporting

confidence: 91%

Section: Exposure Testsupporting

confidence: 53%

Role of Chemical Composition in Corrosion of Aluminum Alloys

Kuchariková

Liptáková

Tillová

et al. 2018

Metals

View full text Add to dashboard Cite

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“…This type of corrosion attack can be related to electrolytic stagnation that induces autocatalytic corrosion occurrence [13,14]; hence, since the mass loss was similar but the pit density of the printed alloy was much lower, the pits in the printed alloy must have been much larger. In addition, it was also apparent that the corrosion attack in the cast alloy had taken place preferably in the vicinity of the casting defects and close to the Fe-Mn enriched precipitates due to their microgalvanic effect [15][16][17][18]. In the printed alloy it could be seen that the corrosion attack tends to progress along the melt pool overlap that contains porosity as an inherent characteristic of the SLM process.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of AlSi10Mg Alloy Produced by Additive Manufacturing (AM) vs. Its Counterpart Gravity Cast Alloy

Leon

Shirizly

Aghion

2016

Metals

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Abstract:The attractiveness of additive manufacturing (AM) relates to the ability of this technology to rapidly produce very complex components at affordable costs. However, the properties and corrosion behavior, in particular, of products produced by AM technology should at least match the properties obtained by conventional technologies. The present study aims at evaluating the corrosion behavior and corrosion fatigue endurance of AlSi10Mg alloy produced by selective laser melting (SLM) in comparison with its conventional counterpart, gravity cast alloy. The results obtained indicate that the corrosion resistance of the printed and cast alloys was relatively similar, with a minor advantage to the printed alloy. The corrosion fatigue endurance of the printed alloy was relatively improved compared to the cast alloy. This was mainly attributed to the significant differences between the microstructure and defect characteristics of those two alloys.

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“…10). [68][69][70] and in general more Si on the surface increases the surface resistance values. Our previous study on these two Al-Si alloy confirms this fact 64 .…”

Section: Electrochemical Behaviormentioning

confidence: 99%

Deposition and Characterization of Cerium-Based Conversion Coating on HPDC Low Si Content Aluminum Alloy

Eslami¹,

Fedel²,

Speranza³

et al. 2017

J. Electrochem. Soc.

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Cerium-based conversion coatings were deposited on high pressure die cast (HPDC) Al-Si alloys using an immersion method. Hydrogen peroxide and sodium chloride were added to the conversion solution to accelerate the coating formation and to understand its formation mechanism. These studies showed that the deposition of cerium hydroxide/oxide conversion layer starts from iron-rich intermetallic particles, which are located inside the eutectic region and then the coating growth continues to cover the entire alloy surface. This phenomenon passivates the active interfaces between iron-rich intermetallic particles and/or the eutectic silicon phase and the aluminum matrix, which are prone to localized corrosion in chloride ions containing environments. Accordingly, values of the total impedance in EIS measurements significantly increased for the treated substrates. Morphologies of the conversion coatings and the oxidation state of cerium compounds were found to be dependent on the composition of the solution and the presence of chloride ions and/or hydrogen peroxide. Aluminum alloy with higher silicon content showed a more active surface during immersion in the conversion solution. This makes it more difficult to be treated using aggressive conversion solutions.

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3D study of intermetallics and their effect on the corrosion morphology of rheocast aluminium alloy

Cited by 44 publications

References 32 publications

Role of Chemical Composition in Corrosion of Aluminum Alloys

Role of Chemical Composition in Corrosion of Aluminum Alloys

Corrosion Behavior of AlSi10Mg Alloy Produced by Additive Manufacturing (AM) vs. Its Counterpart Gravity Cast Alloy

Deposition and Characterization of Cerium-Based Conversion Coating on HPDC Low Si Content Aluminum Alloy

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