Electrochimica Acta

2016

DOI: 10.1016/j.electacta.2015.12.098

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Exploring the electrochemistry of 6xxx series aluminium alloys as a function of Si to Mg ratio, Cu content, ageing conditions and microstructure

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Finnegan and Woods1

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Cited by 80 publications

(32 citation statements)

References 57 publications

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“…Several existing reports have discussed the results related to the IGC susceptibility of Cu containing Al‐Mg‐Si alloys. These authors suggested that precipitation of Q‐phase (Al 4 Cu 2 Mg 8 Si 7 ) at grain boundaries (GBP) of the Cu‐containing alloy increases the susceptibility to IGC because of the micro‐galvanic coupling between them and the less noble precipitate free zones .…”

Section: Resultsmentioning

confidence: 99%

“…The precise sequence of precipitation for Al‐Mg‐Si alloy during the process of ageing is well documented by several researchers . However, the precipitates, inclusions, solute depleted zones and surface defects that exist in the matrix of the alloy could also induce an unfavorable electrochemical heterogeneity diminishing its corrosion resistance . Thus, the microstructural state of an age‐hardenable alloy is also important in defining its corrosion characteristics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Corrosion behavior of under‐, peak‐, and over‐aged 6063 alloy: A comparative study

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2019

Materials & Corrosion

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The mechanical property of age‐hardenable Al‐alloys is governed by the state of ageing, which determines the microstructure and consequently, their corrosion behavior which is a vital aspect for a number of applications. This article presents a comparative assessment of corrosion behavior of under‐, peak‐ and over‐aged Al‐Mg‐Si alloy. Corrosion characteristics have been determined via immersion tests in 0.1 M ortho‐phosphoric acid solution and intergranular corrosion (IGC) tests. Corroded surfaces are examined by field emission scanning electron micrographs‐energy dispersive spectroscopy and 3D optical profilometer. The obtained results reveal that the corrosion rate at a specific immersion time as well as the depth of IGC increases in the order for under‐, peak‐, and over‐aged states. Irrespective of the state of ageing, corrosion loss increases linearly but the rate of corrosion decreases rapidly with increasing immersion time. The dominant mode of corrosion in under‐aged alloy is identified as localized pitting, while peak‐aged is highly susceptible to IGC in contrast extensive pitting corrosion is observed for over‐aged alloy. The observed differences in corrosion behavior are explained considering characteristics of precipitates. Formation of β (Mg2Si) in case of over‐aged alloy and presence of inclusions like AlFeMnSi particles are found to accelerate pitting corrosion.

“…Several existing reports have discussed the results related to the IGC susceptibility of Cu containing Al‐Mg‐Si alloys. These authors suggested that precipitation of Q‐phase (Al 4 Cu 2 Mg 8 Si 7 ) at grain boundaries (GBP) of the Cu‐containing alloy increases the susceptibility to IGC because of the micro‐galvanic coupling between them and the less noble precipitate free zones .…”

Section: Resultsmentioning

confidence: 99%

“…The precise sequence of precipitation for Al‐Mg‐Si alloy during the process of ageing is well documented by several researchers . However, the precipitates, inclusions, solute depleted zones and surface defects that exist in the matrix of the alloy could also induce an unfavorable electrochemical heterogeneity diminishing its corrosion resistance . Thus, the microstructural state of an age‐hardenable alloy is also important in defining its corrosion characteristics.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of under‐, peak‐, and over‐aged 6063 alloy: A comparative study

¹

,

²

2019

Materials & Corrosion

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The mechanical property of age‐hardenable Al‐alloys is governed by the state of ageing, which determines the microstructure and consequently, their corrosion behavior which is a vital aspect for a number of applications. This article presents a comparative assessment of corrosion behavior of under‐, peak‐ and over‐aged Al‐Mg‐Si alloy. Corrosion characteristics have been determined via immersion tests in 0.1 M ortho‐phosphoric acid solution and intergranular corrosion (IGC) tests. Corroded surfaces are examined by field emission scanning electron micrographs‐energy dispersive spectroscopy and 3D optical profilometer. The obtained results reveal that the corrosion rate at a specific immersion time as well as the depth of IGC increases in the order for under‐, peak‐, and over‐aged states. Irrespective of the state of ageing, corrosion loss increases linearly but the rate of corrosion decreases rapidly with increasing immersion time. The dominant mode of corrosion in under‐aged alloy is identified as localized pitting, while peak‐aged is highly susceptible to IGC in contrast extensive pitting corrosion is observed for over‐aged alloy. The observed differences in corrosion behavior are explained considering characteristics of precipitates. Formation of β (Mg2Si) in case of over‐aged alloy and presence of inclusions like AlFeMnSi particles are found to accelerate pitting corrosion.

“…The presence of noise in the cathodic region (absent in the anodic region) of the graphene-coated Cu-Ni alloy is instrumental noise, unlike electrochemical noise. The electrochemical noise persists up to the pitting potential [29]. The instrumental noise was not observed in the case of the uncoated Cu-Ni alloy because these measurements were in the coarser range of the current measurement.…”

Section: Electrochemical Characterisationmentioning

confidence: 93%

Long-Term Corrosion Protection of a Cupro-Nickel Alloy Due to Graphene Coating

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2017

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This study demonstrates the corrosion resistance of a Cu-Ni alloy coated with a multi-layer graphene. This is one of the first demonstrations of long-term corrosion resistance due to graphene coating, which is crucial since earlier studies have suggested graphene-coated copper to be considerably inferior to bare copper in terms of corrosion during long-term exposure to a corrosive environment. The inferior corrosion resistance of graphene-coated copper arises due to defects and poor surface coverage by graphene. Since it is prohibitively difficult to develop defect-free graphene on metals at a commercially feasible scale, this study investigated the hypothesis for an alternative approach, i.e., to develop multi-layer graphene with a reasonable assumption that the areas of defects/poor coverage of a layer will be masked by the subsequent over-layer(s). This study has validated this hypothesis. Electrochemical investigations have demonstrated multi-layer graphene to improve the corrosion resistance of a Cu-Ni alloy by an order of magnitude. However, the most striking finding of this study is that the improvement in corrosion resistance due to the multi-layer graphene coating sustained the entire duration of a long-term test (~350 h).

“…Solidification structure of alloy is the most significant for the performance and the surface appearance of the final products. A large number of scientific literature focused on the effect of alloying elements (Mg, Ti, Zr, Sb, Re, etc) on the microstructure and corrosion resistance of zinc-based coating [13][14][15][16][17][18][19]. It is believed that the corrosion and mechanical properties was strongly affected by the microstructure of zinc alloy coatings.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ti and Zr elements addition on the microstructure and corrosion resistance of Zn-2.5Al-2Mg alloy

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et al. 2020

Mater. Res. Express

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In this article, the effects of Ti and Zr elements addition on the microstructure and corrosion resistance of Zn-2.5Al-2Mg alloy were studied. The microstructure, micro hardness, corrosion resistance of Zn-2.5Al-2Mg alloy were investigated by x-ray diffraction (XRD), Scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), Rockwell hardness tester and Electrochemical workstation, respectively. The result shows that the solidified structure of Zn-2.5Al-2Mg alloys was refined by Al 3 Ti, Al 3 Zr and Al 3 (Ti, Zr) which act as a heterogeneous nucleation site. Moreover, the Rockwell hardness of Zn-2.5Al-2Mg alloys with the addition of Zr was significantly increased. The hardness of this alloy with the same amount of Zr and Ti addition is lower than that of the alloy with Zr addition alone, but obviously higher than that of the alloy with Ti alone. The corrosion resistance of the Zn-2.5Al-2Mg alloys with the same amount of Zr and Ti addition was improved significantly.

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