Influence of magnesium content on the corrosion resistance of the cut-edges of Zn–Mg-coated steel

Thébault, Florian; Vuillemin, Bruno; Oltra, R.; Allély, C.; Ogle, K.; Heintz, O.

doi:10.1016/j.corsci.2015.04.019

Cited by 30 publications

(16 citation statements)

References 21 publications

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“…In the case that the blocking of corrosion on steel is the only reason for the decrease of corrosion at cut-edges, then the resistance related to the corrosion product layer should increase with time. The inhibition of cathodic activity at cut-edges is sometimes attributed to the formation of a dense protective layer on steel [19,20,25,26]. However, the morphology of the corrosion precipitates on steel, found in this work, looks quite porous (not presented).…”

Section: Effect Of the Corrosion Products On The Corrosion Kinetics Acontrasting

confidence: 44%

“…The Mg addition increases the fraction of primary zinc dendrites, which act as active corrosion sites. In contrast, the use of zinc alloys with higher Mg content (Zn-15 Mg, Zn-5.8Mg, Zn-1.5Al-1.5Mg) reveals lower corrosion rate at the cut-edges compared to that found in conventional hot deep galvanized steel cut-edges [24,25]. However, the performance of zinc alloys strongly depends on the testing conditions such as concentration of corrosive solution, solution composition, exposure time etc.…”

Section: Introductionmentioning

confidence: 80%

“…The corrosion behaviour of zinc galvanized steel cut-edges and zinc-iron galvanic couples has been previously studied in literature using various methods such as Scanning Vibrating Electrode Technique (SVET), local potentiometry, local polarization, current potential measurements and others [19][20][21][22][23][24][25][26]. The cut-edge corrosion may strongly depend on the composition of the zinc alloy coating.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel

Yasakau

Kallip

Lisenkov

et al. 2016

Electrochimica Acta

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Section: Effect Of the Corrosion Products On The Corrosion Kinetics Acontrasting

confidence: 44%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel

Yasakau

Kallip

Lisenkov

et al. 2016

Electrochimica Acta

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“…15b reveals that MgO/Mg(OH) 2 peaks were more intense signifying preferential dissolution of Mg which leads to the segregation of Mg corrosion products at the surface of the film. [37][38][39] Mg 1 s de-convolved XPS spectrum at a sputtering time of 60 seconds is shown in Fig. 15c.…”

Section: Surface Composition Analysis-sem/edx Analysis-thementioning

confidence: 99%

SVET and SIET Study of Galvanic Corrosion of Al/MgZn₂in Aqueous Solutions at Different pH

Ikeuba

Zhang

Wang

et al. 2018

J. Electrochem. Soc.

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The galvanic corrosion behavior of synthesized MgZn 2 intermetallic particle coupled with Al in 0.1 M NaCl solutions across pH 2 to12 has been studied using the scanning vibrating electrode technique (SVET), the scanning ion-selective electrode technique (SIET) and X-ray photoelectron spectroscopy (XPS). Results indicate the galvanic dissolution of MgZn 2 depends on pH as well as exposure time. SVET current density maps reveal that MgZn 2 is anodic relative to Al at pH 2 but cathodic at pH 12, while self-dissolution of MgZn 2 prevails at pH 4 and 6. However, the galvanic coupling effect is more pronounced at pH 2 and 12. SIET maps of H + and Cl − ion distribution reveal evidence of local alkalization on MgZn 2 and migration of Cl − ions away from MgZn 2 surface at pH 4 and 6 due to significant accumulation of OH − ions. High strength 7xxx series Al alloys, which are parts of structural components in the aerospace and automotive industry, are vulnerable to localized corrosion in the presence of chloride ions. The localized corrosion manifests in the form of pitting, crevice, inter-granular and exfoliation corrosion, which increase stress corrosion cracking susceptibility.1,2 Localized corrosion is initiated at microstructural inhomogeneities such as grain boundaries or coarse intermetallic phases. Anodic dissolution of grain boundary precipitates (intermetallic particles) such as MgZn 2 is always considered a probable reason for stress corrosion cracking in Al 7xxx series alloys.3 Galvanic corrosion can occur between the intermetallic particles and the surrounding alloy matrix due to the difference between the electrochemical activity of the particles and the matrix, this leads to the deterioration of Al alloys in engineering materials. 4 The electrochemical behavior of MgZn 2 and its role in corrosion of 7xxx series alloys has been investigated by various researchers using various traditional methods.5-8 For instance, electrochemical testing carried out on MgZn 2 by Birbilis et al. 6,7 and Wloka et al. 9 using the microcell method indicates that MgZn 2 is anodic relative to the matrix and corrodes freely above their corrosion potential. Potentiodynamic polarization carried out by Ramgopal et al. 4 on a thin film analog of MgZn 2 indicates that it is anodically very active. The scanning Kelvin probe force microscopy (SKPFM) investigations on Al 7075 by Andreatta and coworkers 5,10,11 revealed that the initiation of the attack at the intermetallic sites is caused by strong potential differences between the matrix and intermetallics, in particular, MgZn 2 particles along grain boundaries. However, the kinetic parameters relating to the galvanic couples could not be provided. It then becomes obvious that some issues remain regarding the galvanic corrosion behavior of MgZn 2 due to lack of information on the kinetics of local processes occurring at the matrix/ solution interface. 6,7,12,13 These issues include the galvanic current density distribution as well as the pH and ion distributions especially in near neutral...

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“…This can be related to the influence of aluminum on the quantity and properties of the corrosion products or to the reduced efficiency of oxygen reduction inhibition in presence of Mg^2+ ions observed in ref. .…”

Section: Resultsmentioning

confidence: 99%

Corrosion protection of steel cut‐edges by hot‐dip galvanized Al(Zn,Mg) coatings in 1 wt% NaCl: Part I. Experimental study

Долгих

Simillion

Lamaka

et al. 2018

Materials & Corrosion

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Corrosion of AlZnMg coated steel in chloride media is a complicated process, which progress is determined not only by the electrode reactions but also by the local pH and formation of soluble and insoluble corrosion products. In order to adequately describe and predict the corrosion behavior of steel/AlZnMg cut‐edge, a multi‐ion transport, and reaction model (MITReM) is built. Such model takes into account the transport of species in the solution together with their production/consumption in electrochemical and chemical reactions. The main aim of this work is the validation of a numerical model for describing and predicting corrosion of steel/AlZnMg cut‐edge in immersed conditions. This first part describes the experimental work done to obtain model input parameters and validation measurements. The metallic coatings are characterized experimentally with respect to their composition and microstructure, global and local electrochemical behavior (polarization curves, AESEC, and SVET). Local distribution of corrosion products and local pH are also characterized. No blocking effect of the precipitated corrosion products has been observed and dedicated measurements are performed to validate this observation. Based on the experimental input from this part, numerical models of cut‐edge corrosion with different levels of details are developed in Part II.

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Influence of magnesium content on the corrosion resistance of the cut-edges of Zn–Mg-coated steel

Cited by 30 publications

References 21 publications

Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel

Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel

SVET and SIET Study of Galvanic Corrosion of Al/MgZn₂in Aqueous Solutions at Different pH

Corrosion protection of steel cut‐edges by hot‐dip galvanized Al(Zn,Mg) coatings in 1 wt% NaCl: Part I. Experimental study

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Influence of magnesium content on the corrosion resistance of the cut-edges of Zn–Mg-coated steel

Cited by 30 publications

References 21 publications

Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel

Initial stages of localized corrosion at cut-edges of adhesively bonded Zn and Zn-Al-Mg galvanized steel

SVET and SIET Study of Galvanic Corrosion of Al/MgZn2in Aqueous Solutions at Different pH

Corrosion protection of steel cut‐edges by hot‐dip galvanized Al(Zn,Mg) coatings in 1 wt% NaCl: Part I. Experimental study

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SVET and SIET Study of Galvanic Corrosion of Al/MgZn₂in Aqueous Solutions at Different pH