Zn-Al-Mg Coatings: Thermodynamic Analysis and Microstructure Related Properties

Bruycker, Evy De; Zermout, Zinedine; Cooman, B.C. De

doi:10.4028/0-87849-428-6.1276

Cited by 9 publications

(16 citation statements)

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“…In recent years, hot-dip galvanizing Zn coatings containing Mg, referred to as a promising next generation of Zn-based coatings, have received considerable attention, primarily due to their superior corrosion resistance with respect to GI (Zn-0.20 wt % Al) coating [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] or Zn-Al coatings [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…For Zn-Al-Mg coatings with high Al, the role of Al is to impede the oxidation of Zn liquid and enhance corrosion resistance. The conventional continuously hot-dip galvanizing technique was applied to mass-produce this type of Zn based coatings [ 3 , 4 , 5 , 8 , 9 , 10 , 11 , 12 ]. For Zn-Al-Mg coatings with very low Al or without Al, hereafter referred to as Zn-Mg coatings, other techniques, such as physical vapor deposition (PVD) [ 7 , 13 , 14 ], batching galvanizing [ 6 , 15 ], electrodeposition (EG) [ 16 , 17 , 18 ], and the two-step method [ 2 ], were selected to produce these Zn-based coatings to avoid interference of the oxidation of Mg with production.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating

Dong

et al. 2017

Materials

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The microstructure of continuously hot-dip galvanizing Zn-Mg coating was investigated in order to obtain the mechanism of the effects of Mg on the corrosion resistance. In this paper, the vertical section of the Zn-0.20 wt % Al-Mg ternary phase diagram near the Al-low corner was calculated. The results indicates that the phase composition of the Zn-0.20 wt % Al-Mg ternary phase diagram near the Al-low corner is the same as Zn-Mg binary phase diagram, suggesting Al in the Zn-Mg (ZM) coatings mainly concentrates on the interfacial layer between the coating and steel substrate. The microstructure of continuously hot-dip galvanizing ZM coatings with 0.20 wt % Al containing 1.0–3.0 wt % Mg was investigated using tunneling electron microscopy (TEM). The morphology of Zn in the coating changes from bulk to strip and finally to mesh-like, and the MgZn2 changes from rod-like to mesh-like with the Mg content increasing. Al in the ZM coatings mainly segregates at the Fe2Al5 inhibition layer and the Mg added to the Zn bath makes this inhibition layer thinner and uneven. Compared to GI coating, the time of the first red rust appears increases by more than two-fold and expansion rate of red rust reduces by more than four-fold in terms of salt spray experiment. The ZM coating containing 2.0 wt % Mg has the best corrosion resistance. The enhanced corrosion resistance of ZM coatings mainly depends on different corrosion products.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating

Dong

et al. 2017

Materials

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“…The inhibiting effect of Al when compared to pure zinc coating attribute to the reduction in the columnar Fe-Zn compound content [2,20]. It is probable that steel wires alloy coatings are composed of primary Zn dendrites, Zn-MgZn 2 binary eutectic and Zn-Al-MgZn 2 ternary eutectic [21][22][23]. The intensity of the peak due to Zn-6%Al-3%Mg-RE consists of a large amount of magnesium and aluminum.…”

Section: Xrd Analysis Of Steel Wiresmentioning

confidence: 99%

Thermal stability and Anti-Corrosion analysis of alloy coatings on Overhead Ground Wires

Guo¹,

Du²,

Liu³

et al. 2015

Proceedings of the 4th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering 2015

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Abstract. In this work, alloy coatings with different Al and Mg content have been prepared on overhead ground wires for Zn-Al-Mg series hot-dip coatings providing good protection on mild steel surface against corrosion. A reinforced thermal stability is confirmed by DSC thermodynamic curves. Furthermore, the enhanced corrosion resistance is also observed by salt spray test at 35℃ in terms of morphology, weight change. Those features have a direct synergistic effect for corrosion protection of overhead ground wires at different stages in heavy corrosion environment and attributes to the improved metallographic structures from certain ternary eutectic reaction in alloy solidification.

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“…These also include Zn-Al-Mg-based coatings such as Magizinc (MZ) with Zn 1.6 wt.% Al and 1.6 wt.% Mg. It is widely used in the coating industry including steel sheet production for building, energetics, and the automotive industry [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Sn Addition on Zn-Al-Mg Alloy; Part II: Corrosion Behaviour

et al. 2021

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Corrosion behaviour of Sn (0.0, 0.5, 1.0, 2.0 and 3.0 wt.%)-doped Zn 1.6 wt.% Al 1.6 wt.% Mg alloys exposed to salt spray testing was investigated. Intergranular corrosion was observed for all alloys in both as-cast and annealed states. However, due to microstructure spheroidisation in the annealed samples, potential intergranular corrosion paths are significantly reduced. Samples with 0.5 wt.% of Sn showed the best corrosion properties. The main corrosion products identified by XRD analysis for all samples were simonkolleite and hydrozincite. Occasionally, ZnO and AlO were identified in limited amounts.

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Zn-Al-Mg Coatings: Thermodynamic Analysis and Microstructure Related Properties

Cited by 9 publications

References 0 publications

Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating

Effect of Mg on the Microstructure and Corrosion Resistance of the Continuously Hot-Dip Galvanizing Zn-Mg Coating

Thermal stability and Anti-Corrosion analysis of alloy coatings on Overhead Ground Wires

The Effect of Sn Addition on Zn-Al-Mg Alloy; Part II: Corrosion Behaviour

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