Electrochemical property of Al-Si alloy brazing filler.

Kuroda, Shuu; Itagaki, Takeshi; Tohma, Ken

doi:10.2464/jilm.46.113

Cited by 15 publications

(6 citation statements)

References 6 publications

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“…Consequently, the corrosion may occur mainly in the aAl phases for ADC12. Similar corrosion characteristics for Al-Si alloys have been observed in previous work, 22 in which the eutectic a-Al phases are strongly corroded, resulting in exposure to the eutectic Si and primary a-Al phases on the corrosion surface. A comparison of the HMC and GC sample shows that more severe corrosion occurs in both GC-ADC6 and GC-ADC12.…”

Section: Resultssupporting

confidence: 80%

Corrosion and mechanical properties of cast aluminium alloys

Okayasu

Takeuchi

Shiraishi

2013

International Journal of Cast Metals Research

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The corrosion and mechanical properties of cast aluminium alloys [ADC6(Al-Mg) and ADC12(AlSi-Cu)] have been investigated. Specifically, cast samples with different microstructural characteristics were produced using two different casting techniques, namely, gravity casting (GC) and heated mould continuous casting (HMC). For ADC6, intergranular corrosion occurs mainly through the eutectic Mg 2 Si and Al 6 (Mn,Fe) phases and the precipitate free zone around the eutectic structures. On the other hand, pitting corrosion in the a-Al phase is the dominant feature for ADC12. Such corrosion characteristics can be interpreted from the material properties (polarisation resistance and electrode potential) of the individual structures, such as the a-Al phase, eutectic a-Al phase and precipitate phase. It also appeared that the extent of corrosion is affected by the size of the microstructure; the ADC6 sample with small second phases has a high corrosion resistance due to the limited area for corrosion. In addition, the higher proportion of solid solution in the a-Al phase of ADC6, arising from the high cooling rate, makes a high corrosion resistance because of the change of electrode potential. A different trend is obtained for ADC12 due to the pitting corrosion, where low corrosion resistance is obtained for the sample with tiny grain. The tensile strength and ductility for both HMC samples (ADC6 and ADC12) are higher than those for the GC equivalents, which is caused by the presence of tiny microstructures and uniform crystal orientation. However, the mechanical properties of HMC samples decrease dramatically during corrosion, although these are still high compared to those of the GC samples without corrosion.

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Section: Resultssupporting

confidence: 80%

Corrosion and mechanical properties of cast aluminium alloys

Okayasu

Takeuchi

Shiraishi

2013

International Journal of Cast Metals Research

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“…1, while for Cu a relatively high Cu-content (b 0.1 %) in 6063 extrusions may, also to some relatively minor extent, favour filiform corrosion on chromated aluminium [12]. The open circuit potential of an Al-Si alloy will increase as a function of Si concentration in solid solution when exposed to an acidic chloride containing solution [23]. The minor corrosion observed on chromated samples as a function of metal composition is not filiform corrosion in the classical manner, but characterised by successive pitting as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Filiform corrosion formation on painted aluminium extrusions

Nordlien

Defrancq

Zust

et al. 2000

Materials and Corrosion

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The filiform corrosion susceptibility of extruded, chromated and coated AA 6060/6063 alloys has been investigated. It is shown that, provided sufficient metal is removed before chromating, these alloys will exhibit high filiform corrosion resistance. In those cases where extensive filiform corrosion attack is observed during corrosion testing it is shown to be due to a reactive surface region, formed during the thermo‐mechanical processing of the alloy and remaining after chemical pretreatment for painting.

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“…4. It can be observed that the preferentially corroded spots consist of an a-Al solid solution as well as Al -Si and Al -Si -Cu eutectic phases [11,12], while the CuAl 2 (q) intermetallic compounds and Si particles remain immune from corrosion due to attributes nobler than those corroded phases.…”

Section: Al -Si -Cu Filler Metalsmentioning

confidence: 99%