Microstructural impact on intergranular corrosion and the mechanical properties of industrial drawn 6056 aluminum wires

Zander, Daniela; Schnatterer, Christian; Altenbach, Christoph; Chaineux, Veronika

doi:10.1016/j.matdes.2015.05.079

Cited by 55 publications

(29 citation statements)

References 25 publications

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“…The aim of the present paper was to investigate the usability of the electrochemical method for Cu‐rich 6000 alloys and to analyze the comparability with the results from Method B. The latter one is widely used in academic corrosion investigations and its suitability for the 6056 aluminum alloy was already shown by other investigations and confirmed by the present study. Figure shows the results of the different experiments conducted within the present investigation in terms of absolute values for the maximum penetration depth.…”

Section: Discussionsupporting

confidence: 61%

“…The Al‐Mg‐Si based 6000 aluminum alloy series is often considered rather insusceptible to intergranular corrosion (IGC), especially when compared to the other precipitation hardening 2000, 5000, or 7000 alloys . Nonetheless, certain factors are known that can lead to IGC vulnerability, most particularly the Mg/Si ratio, the amount of Cu and the heat treatment condition . Even though the exact corrosion mechanisms remain still unclear, some evidence of the involvement of noble Q‐phases, nano‐scale Cu‐rich films precipitated on the grain boundaries, and formation of depletion zones during artificial aging is shown in the literature .…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the intergranular corrosion susceptibility of Al‐Mg‐Si‐Cu alloys using electrochemical methods

Schnatterer

Bulinger

Zander

2016

Materials & Corrosion

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The susceptibility of the 6056 aluminum alloy in the solution annealed (T4) and artificially aged (T6) condition to intergranular corrosion (IGC) was investigated utilizing the established testing standard ISO 11846 B and an electrochemical procedure specified as ISO 11846C. The first method showed significant differences in the corrosion properties of the materials, namely a high pitting susceptibility of the T4 treated material and an exclusive intergranular attack in the artificially aged samples. The electrochemical technique was not suitable to confirm these distinct corrosion properties. However, an alloy specific adaption of the standard was conducted to give comparable results and to qualify the method for high Cu containing 6000 alloys.

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Section: Discussionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Evaluating the intergranular corrosion susceptibility of Al‐Mg‐Si‐Cu alloys using electrochemical methods

Schnatterer

Bulinger

Zander

2016

Materials & Corrosion

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“…Consequently, the change of corrosion mechanisms can be attributed to the artificial aging process. [19] No microstructural modification as a result of the aging process could be identified using SEM. However, the STEM investigations indicated an appreciable alteration of the grain boundary microchemistry due to the T6 treatment.…”

Section: Discussionmentioning

confidence: 99%

Influence of the grain boundary chemistry on the intergranular corrosion mechanisms of a high‐strength Al‐Mg‐Si alloy

Schnatterer

Zander

2015

Surface & Interface Analysis

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The influence of solution annealing (T4) and artificial aging (T6) on the corrosion properties of a technical Al-Mg-Si alloy was investigated. In the T4 condition, the material was not susceptible to intergranular corrosion; however, pitting was identified to occur. Subsequent artificial aging of the solution annealed and quenched alloys introduced susceptibility to intergranular corrosion. This phenomenon was attributed to two microgalvanic coupling situations: one that occurred between the noble Cu-phases located on the grain boundary and the anodic adjacent area and one between a Mg-and Si-depleted zone along the grain boundaries and the adjacent area. Pitting corrosion was proposed to occur as a result of the absence of these microgalvanic coupling situations, and therefore with the absence of a distinct, preexisting corrosion path in the solution annealed condition.

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“…However, this concentration also forms an abundance of the b-phases (Al 3 Mg 2 , Al 8 Mg 5 , Mg 2 Al 3 ) which are known to be deleterious in the corrosion performance. Because the b-phase is anodic, its presence enhances the selective dissolution on the coating surface, thus creating sites for deep pits in seawater [8][9][10][11]33]. The local corrosion type of Al-5Mg spray coating layer lowers the efficiency of sacrificial anode and will have the negative effect on the sacrificial anode for corrosion protection [37].…”

Section: Resultsmentioning

confidence: 99%

“…This reason is that the solubility of Mg is very high at elevated temperature, about 15% at 450°C, but it dose not exceed 1% at the room temperature [10]. The intermetallic particles in Al-Mg alloys include mainly the b-phase (Al 3 Mg 2 or Al 8 Mg 5 ) which can be the action as anodes to the aluminum matrix and become the common sites for pitting nucleation [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

Park

Kim

2016

Acta Metall. Sin. (Engl. Lett.)

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For corrosion protection of carbon steel in a marine environment, cold arc thermal spray coating was applied to the surface with Al and Al-Mg alloy wires. The surface hardness of Al and Al-Mg thermal spray coatings increased with Mg content. And the various electrochemical experiments were carried out to evaluate corrosion damage characteristics of the thermal spray coating layers. The Al and Al-Mg thermal spray coating layers presented negative potentials compared to carbon steel in corrosion potential measurements. And an anodic polarization experiment revealed a tendency of activation polarization with no passivation. Furthermore, the corrosion damage of the thermal spray coating layer in galvanostatic experiment was observed mainly at the defect area, and the Al-3Mg thermal spray coating layer presented less surface damages than others. In addition, the Al-3Mg thermal spray coating layer showed the lowest corrosion rate while having a sufficient driving voltage for cathodic corrosion protection. Therefore, it is an optimal thermal spray material for sacrificial anode.

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Microstructural impact on intergranular corrosion and the mechanical properties of industrial drawn 6056 aluminum wires

Cited by 55 publications

References 25 publications

Evaluating the intergranular corrosion susceptibility of Al‐Mg‐Si‐Cu alloys using electrochemical methods

Evaluating the intergranular corrosion susceptibility of Al‐Mg‐Si‐Cu alloys using electrochemical methods

Influence of the grain boundary chemistry on the intergranular corrosion mechanisms of a high‐strength Al‐Mg‐Si alloy

Electrochemical Characteristics in Seawater for Cold Thermal Spray-Coated Al–Mg Alloy Layer

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