Microstructure of hot-dip galvanized Zn-Al-Mg alloy coating

Yu, Kangcai; Li, Jun; Liu, Xin; Li, Jianguo; Xue, Xiao-huai

doi:10.1007/s12204-012-1342-5

Cited by 18 publications

(11 citation statements)

References 13 publications

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“…The corrosion products of Zn-Al-Mg alloy coating were deposited on the substrate surface, which effectively isolated the corrosion of the coating. The corrosion products of the dense Zn 6 Al 2 (OH) 16 CO 3 •4H 2 O and Zn 5 (OH) 8 Cl 2 •H 2 O exhibited good protection from the coating (Yu et al, 2012).…”

Section: Test Resultsmentioning

confidence: 99%

“…At the same time, the addition of Mg promoted the transformation of Zn (OH) 2 to the corrosion products Zn 5 (OH) 8 Cl 2 ·2H 2 O and Zn 6 Al(OH) 16 CO 3 ·H 2 O. The corrosion products attached to the surface of the coating and generated a compact protective film, which effectively cut down the rate of corrosion reaction to the interior of the coating (Yuan et al , 2015). Then, the corrosion resistance of the coating would be restored, and the “self-repair” function of the Zn–Al–Mg alloy coating would be realized, as shown in Figure 9.…”

Section: Corrosion Resistance Of Zn–al–mg Alloy Coatingmentioning

confidence: 99%

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Experimental study on corrosion resistance of Zn–Al–Mg alloy coating of high-strength steel wires for bridge cables

Hu,

Song,

Zhang

et al. 2023

ACMM

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Purpose This paper aims to figure out the conundrum that the corrosion resistance longevity of steel wires for bridge cables was arduous to meet the requirements. Design/methodology/approach The “two-step” hot-dip coating process for cable steel wires was developed, which involved first hot-dip galvanizing and then hot-dip galvanizing of aluminum magnesium alloy. The corrosion rate, polarization curve and impedance of Zn–6Al–1Mg and Zn–10Al–3Mg alloy-coated steel wires were compared through acetate spray test and electrochemical test, and the corrosion mechanism of Zn–Al–Mg alloy-coated steel wires was revealed. Findings The corrosion resistance of Zn–10Al–3Mg alloy-coated steel wires had the best corrosion resistance, which was more than seven times that of pure zinc-coated steel wires. The corrosion current of Zn–10Al–3Mg alloy-coated steel wires was lower than that of Zn–6Al–1Mg alloy-coated steel wires, whereas the capacitive arc and impedance value of the former were higher than that of the latter, making it clear that the corrosion resistance of Zn–10Al–3Mg was better than that of Zn–6Al–1Mg alloy coating. Moreover, the Zn–Al–Mg alloy-coated steel wires for bridge cables had the function of coating “self-repairing.” Originality/value Controlling the temperature and time of the hot dip galvanizing stage can reduce the thickness of transition layer and solve the problem of easy cracking of the transition layer in the Zn–Al–Mg alloy coating due to the Sandelin effect.

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Section: Test Resultsmentioning

confidence: 99%

Section: Corrosion Resistance Of Zn–al–mg Alloy Coatingmentioning

confidence: 99%

Experimental study on corrosion resistance of Zn–Al–Mg alloy coating of high-strength steel wires for bridge cables

Hu,

Song,

Zhang

et al. 2023

ACMM

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“…The proportions of MgZn 2 and Mg 2 Zn 11 in the ZAM1-3 coatings, as shown in Table 2, indicate that Mg 2 Zn 11 is the dominant phase in the coatings at a cooling rate of 5 • C/s. The primary reason for this is the slow change in temperature, which allows the metastable phases formed first by the eutectic reaction (9) to transform into Mg 2 Zn 11 through the peritectic reaction (10).…”

Section: Simulation Calculation Resultsmentioning

confidence: 99%

Thermodynamic Simulation Calculations of Phase Transformations in Low-Aluminum Zn-Al-Mg Coatings

Zhang,

Zhao

et al. 2024

Materials

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This study delves into the formation, transformation, and impact on coating performance of MgZn2 and Mg2Zn11 phases in low-aluminum Zn-Al-Mg alloy coatings, combining thermodynamic simulation calculations with experimental verification methods. A thermodynamic database for the Zn-Al-Mg ternary system was established using the CALPHAD method, and this alloy’s non-equilibrium solidification process was simulated using the Scheil model to predict phase compositions under varying cooling rates and coating thicknesses. The simulation results suggest that the Mg2Zn11 phase might predominate in coatings under simulated production-line conditions. However, experimental results characterized using XRD phase analysis show that the MgZn2 phase is the main phase existing in actual coatings, highlighting the complexity of the non-equilibrium solidification process and the decisive effect of experimental conditions on the final phase composition. Further experiments confirmed that cooling rate and coating thickness significantly influence phase composition, with faster cooling and thinner coatings favoring the formation of the metastable phase MgZn2.

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“…Recent studies show that Zn-Al alloys have promising applications as metallic coatings, mainly with additions of Mg [29][30][31]. Rai et al [29] show that the improvement in the corrosion resistance of steel coated with a Zn-Al-Mg alloy is due to preferential dissolution of MgZn 2 present in the interdendritic regions of Zn-rich phases, promoting better sacrificial protection.…”

Section: Introductionmentioning

confidence: 99%

Hypereutectic Zn–Al Alloys: Microstructural Development under Unsteady-State Solidification Conditions, Eutectic Coupled Zone and Hardness

Septimio

Silva

Costa

et al. 2022

Metals

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The present study investigates the effects of Al content and solidification thermal parameters on the microstructural development under transient heat flow conditions for two hypereutectic Zn–Al alloys: Zn-6wt.%Al and Zn-11wt.%Al. The alloys were directionally solidified and had experimental cooling profiles monitored permitting cooling rates and growth rates to be determined along the length of the directionally solidified (DS) castings. The microstructure of the Zn-6wt.%Al alloy is shown to be formed by eutectic colonies, constituted by a eutectic mixture of (Zn) and (Al′) phases in the form of lamellae and the Zn-11wt.% Al alloy by the pro-eutectic (Al′) dendrites and the eutectic mixture in the interdendritic regions. Growth laws are experimentally determined relating eutectic and dendritic spacings to the growth rate and cooling rate. A diagram exhibiting the coupled zone of Zn–Al alloys as a function of cooling rate is proposed, which shows different microstructural morphologies influenced by composition and thermal parameters, that is, growth rate and the temperature gradient, synthesized by the cooling rate (Ṫ = G.V). The microhardness of both Zn-6wt.%Al and Zn-11wt.%Al alloys were shown not to depend on the length scale of the resulting microstructure.

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Microstructure of hot-dip galvanized Zn-Al-Mg alloy coating

Cited by 18 publications

References 13 publications

Experimental study on corrosion resistance of Zn–Al–Mg alloy coating of high-strength steel wires for bridge cables

Experimental study on corrosion resistance of Zn–Al–Mg alloy coating of high-strength steel wires for bridge cables

Thermodynamic Simulation Calculations of Phase Transformations in Low-Aluminum Zn-Al-Mg Coatings

Hypereutectic Zn–Al Alloys: Microstructural Development under Unsteady-State Solidification Conditions, Eutectic Coupled Zone and Hardness

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