Numerical modelling of the galvanic coupling in aluminium alloys: A discussion on the application of local probe techniques

Murer, Nicolas; Oltra, R.; Vuillemin, Bruno; Neel, O. Le

doi:10.1016/j.corsci.2009.08.051

Cited by 112 publications

(52 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, synthetic bulk material with the same composition of intermetallic particles was used for investigations by SVET which can detect a potential gradient with reasonable resolution. For instance, many researchers [17][18][19][20][21] have successfully measured the galvanic currents during the galvanic corrosion of several couples (Zn/Fe, Al 2 Cu/Al, Al 3 Fe/Al, Al/Al4%Cu) by SVET. Shi et al 22 used SVET to study the galvanic corrosion of coupled Al 2 CuMg and Al wires embedded in an epoxy sleeve.…”

mentioning

confidence: 99%

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

Zhang

Tian

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

The galvanic corrosion behavior between pure Al and synthesized bulk Mg 2 Si in 0.01 M NaCl solution at different pH values has been investigated by the scanning vibrating electrode technique (SVET). At pH 2, bulk Mg 2 Si actively dissolves and it acts as an anode. With the increase of exposure time, the anodic activity of Mg 2 Si decreases drastically and eventually anodic activity appears on Al surface. In alkaline solution, Mg 2 Si phase always acts as the cathode. The preferential dissolution of Mg and enrichment of Si found by energy dispersive X-ray spectroscopy are responsible for the observed anodic activity decay of Mg 2 Si in acidic solution. At pH 6, the galvanic corrosion current of Al/Mg 2 Si couple is much less than those at pH 2 and pH 13, and Mg 2 Si mainly undergoes self-dissolution. These results indicate that the dealloying of binary Mg 2 Si phase depends on the solution pH value and corrosion time, which subsequently have a great influence on the galvanic corrosion current of Al/Mg 2 Si couple. Al-Mg-Si alloys are widely used in automotive, aerospace and rail transportation industries because of their high stiffness, good formability, good weldability and high corrosion resistance.1-5 Due to the low solubility of the alloying additions, second phases (such as Mg 2 Si precipitates) are commonly formed in Al-Mg-Si alloys.6 These particles have different electrochemical activities from the alloy matrix, thus galvanic corrosion can occur between the particles and surrounding matrix, 7-10 which gives rise to the degradation of Al alloys in industrial applications.Potentiodynamic polarization tests carried out by Buchheit et al. 7,8 have shown that the corrosion potential of Mg 2 Si is much lower than the alloy matrix. The Volta potential of Mg 2 Si particle measured by scanning kelvin probe force microscopy (SKPFM) is about 100∼180 mV lower than the aluminum matrix. 10 These reports indicate that Mg 2 Si particle is initially anodic relative to the aluminum matrix.Selective dissolution of Mg has been found by many research groups during the corrosion of Mg 2 Si phases. 4,9,[11][12][13] For example, Jain et al. 11 found that Mg 2 Si particle can selectively dissolve in neutral solution. Wolka et al.12 measured the open circuit potential (OCP) of Mg 2 Si using a microcapillary electrochemical cell and stated that the increase of OCP after 1 h immersion in 0.01 M NaCl solution is due to the preferential dissolution of Mg. Mg 2 Si particles in AlMg-Si alloys have also been investigated by SKPFM in combination with atomic force microscopy (AFM) observation, 13 electrochemical micro-cell measurements combined with electron probe micro analysis (EPMA) and auger electron spectroscopy (AES).4 These techniques reveal that high reactivity of Mg leads to the dealloying of Mg 2 Si particles accompanied with the enrichment of Si, which finally makes the Mg 2 Si remnant exhibit cathodic activity. Although SKPFM can measure Volta potential, it cannot provide kinetics parameters relating to the galvanic corrosion ...

show abstract

mentioning

confidence: 99%

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

Zhang

Tian

et al. 2017

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…Thus, for both assemblies, the initial step of the corrosion process was the dissolution of the Al part at the Al/Cu interface due to the alkalinisation linked to the oxygen reduction reaction on the Cu part [19]. The electrochemical reactions that justify the aluminium corrosion were as follows [38,[40][41][42]:…”

Section: Preliminary Experiments and Observationsmentioning

confidence: 99%

Corrosion behaviour of an assembly between an AA1370 cable and a pure copper connector for car manufacturing applications

Gravina

Pébère

Laurino³

et al. 2017

Corrosion Science

View full text Add to dashboard Cite

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr The corrosion behaviour of an assembly between an AA1370 cable and a pure copper connector for wiring harnesses was studied in neutral chloride and sulphate containing solution. Electrochemical impedance measurements showed that the corrosion behaviour of the cable was controlled by the ingress of the electrolyte inside cable cavities. Further, local impedance measurements were performed on two assembly cross-sections, i.e. with and without cavities in the aluminium cable. The results provided evidence for both the galvanic coupling between aluminium and copper and the presence of cavities in the aluminium cable as relevant explanations for the corrosion behaviour of the assembly. ©

show abstract

“…The publications of Murer et al [10][11][12] and Shi and Kelly [13] in this context also gave an extended insight into the topic, especially in the very important choice of boundary conditions. New studies of Sun et al [14], who applied the mathematical approach of Yan et al [15] to the modeling of deposit formation under seawater conditions, clearly introduce a possible way of a useful model built up for the mentioned purpose.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Galvanic Corrosion between Carbon Steel and Low Alloy Steel in a Bolted Joint

Radouani

Ech-charqy

Essahli

2017

International Journal of Corrosion

View full text Add to dashboard Cite

The galvanic corrosion of a bolt joint combining carbon steel end plate and low alloy steel bolt was investigated electrochemically in a 1 M HCl solution. The corrosion parameters of the joint components were used for numerical simulation using Comsol Multiphysics software to analyze the galvanic corrosion behavior at the contact zone between the head bolt and the end plate. In this research work we evaluate the variation of the corrosion rate in the steel end plate considered as the anode, in order to determine the lifetime of the bolted assembly used in steel structures. Three materials (20MnCr5, 42CrMo4, and 32CrMoV13) and three bolts (M12, M16, and M20) were tested in two thicknesses of electrolyte 1 M HCl ( = 1 mm, = 20 mm). It is found that the corrosion rate of the anode part (end plate) is higher for 32CrMoV13 materials and it increases if both diameter of the bolt and thickness of the electrolyte increase (Cr(M20) > Cr(M16) > Cr(M12) and Cr( = 20 mm) > Cr( = 1 mm)). This corrosion rate is higher in the contact area between the bolt head and the end plate, and it decreases if we move away from this contact area.

show abstract

Numerical modelling of the galvanic coupling in aluminium alloys: A discussion on the application of local probe techniques

Cited by 112 publications

References 24 publications

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

Corrosion behaviour of an assembly between an AA1370 cable and a pure copper connector for car manufacturing applications

Numerical Simulation of Galvanic Corrosion between Carbon Steel and Low Alloy Steel in a Bolted Joint

Contact Info

Product

Resources

About

Numerical modelling of the galvanic coupling in aluminium alloys: A discussion on the application of local probe techniques

Cited by 112 publications

References 24 publications

SVET Study of Galvanic Corrosion of Al/Mg2Si Couple in Aqueous Solutions at Different pH

SVET Study of Galvanic Corrosion of Al/Mg2Si Couple in Aqueous Solutions at Different pH

Corrosion behaviour of an assembly between an AA1370 cable and a pure copper connector for car manufacturing applications

Numerical Simulation of Galvanic Corrosion between Carbon Steel and Low Alloy Steel in a Bolted Joint

Contact Info

Product

Resources

About

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH

SVET Study of Galvanic Corrosion of Al/Mg₂Si Couple in Aqueous Solutions at Different pH