Effect of fluxing chemical: An option for Zn–5wt.%Al alloy coating on wire surface by single hot dip process

Manna, M.

doi:10.1016/j.surfcoat.2011.01.026

Cited by 25 publications

(9 citation statements)

References 11 publications

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“…However, ZnAlMg coatings have many limitations when using the batch hot-dip galvanizing method. The main limitation of their application is the lack of an appropriate flux [ 11 , 12 , 13 ], excessive dissolution of iron in the bath [ 14 ], excessive growth of the diffusion layer of the coating, and the formation of a periodic layered structure [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Behavior of ZnAl12Mg3Si0.3 Double-Batch Hot-Dip Coatings

et al. 2023

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This article presents the microstructure (SEM) and corrosion behavior of ZnAl12Mg3Si0.3 (ZAMS) coatings obtained by the double hot-dip method on Sebisty steel with increased strength. On the basis of chemical composition studies in micro-areas (EDS) and phase composition studies (XRD), structural components of the coating and corrosion products formed on the coating surface after exposure to the neutral salt spray (NSS) test (EN ISO 9227) were identified. The presence of the Fe(Al,Si,Zn)3 intermetallic phase was found in the Fe-Al intermetallic layer, while in the outer layer, dendrites rich in Al and Zn were identified. In these dendrites, the eutectics of Zn/MgZn2 and precipitates of the MgZn2 phase and Si were located. The NSS test showed better corrosion resistance of ZAMS coatings compared to conventional zinc hot-dip coatings. The increase in corrosion resistance is due to the formation of favorable corrosion products: simonkolleite—Zn5(OH)8Cl2·H2O and hydrozincite—Zn5(OH)6(CO3)2, and the presence of the MgZn2 phase in the coating, which is more anodic than other structural components.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Behavior of ZnAl12Mg3Si0.3 Double-Batch Hot-Dip Coatings

et al. 2023

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“…It is difficult to obtain a Zn-Al-Mg coating with good surface quality by using a conventional flux (ZnCl 2 and NH 4 Cl). Al and Mg reacted with ZnCl 2 and NH 4 Cl during the hotdipping of the Zn-Al-Mg alloy, and defects such as black spots and skip plates were formed [25]. Simultaneously, the addition of Al and Mg increased the surface tension of the liquid alloy, making it difficult for the steel substrate to be wetted by the liquid alloy [26].…”

Section: Introductionmentioning

confidence: 99%

“…Different components in the flux have different effects. ZnCl 2 has a low melting point and a high boiling point, and is acidic after dissolving in water, which can prevent the oxidation of the steel matrix and has a good cleaning effect on the surface [25]. The hydrogen chloride and ammonia gas generated by NH 4 Cl during the flux plating reaction can remove oxides on the surface of the steel substrate.…”

Section: Introductionmentioning

confidence: 99%

Wetting of liquid Zinc-aluminum-magnesium alloy on steel substrate during hot-dipping: Understanding the role of the flux

Zheng

Han

et al. 2022

Surf. Topogr.: Metrol. Prop.

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The surface quality of hot-dipping Zn-Al-Mg coatings was significantly influenced by the composition of fluxes. In this study, five different fluxes were chosen and named as F1 (ZnCl2, NH4Cl), F2 (ZnCl2, NaF), F3 (ZnCl2, NH4Cl, KCl), F4 (ZnCl2, NH4Cl, KCl, SnCl2, HCl), and F5 (ZnCl2, NH4Cl, KCl, BiCl3, HCl). Using the sessile drop method, the influence of different fluxes on the wettability between the liquid Zn-Al-Mg alloy and the steel substrate was elucidated. The results showed that: when the flux composition is ZnCl2-NH4Cl-KCl-BiCl3-HCl, a uniform and dense salt film with a protective effect can be formed on the steel substrate, which prevents the oxidation of the steel substrate and removes the harmful reaction products during hot-dipping. By reducing the solid–liquid interface energy, increasing the work of adhesion between the liquid Zn-6Al-3Mg alloy and steel substrate, and shortening the interface reaction time, the strongest wetting effect between the liquid Zn-6Al-3Mg alloy and the steel substrate was achieved. The coating surface quality was the highest after using the F5 flux. Finally, the mechanism of the assistant plating is discussed.

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“…Environmental corrosion seriously affects its quality, which brings huge losses to the national economy. At present, there are more and more reports on the corrosion protections in China and abroad, such as hot-dip galvanizing, thermal spraying and other methods (Ohtsuka, 2012;Cocco et al, 2017;Manna, 2011;Baker et al, 2000). Among them, hot-dip galvanizing produces a large amount of waste water and gas, which pollutes the environment, while thermal sprayed coatings have some defects such as porosity, micro-crack and low bonding strength, which decreases its corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Salt spray corrosion and electrochemical corrosion performances of Dacromet fabricated Zn–Al coating

Liu

Dejun

2019

ACMM

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Purpose This study aims to investigate the salt spray corrosion (SSC) and electrochemical corrosion of obtained Zn–Al coating, which provided a basis for comprehensive analysis of corrosion behavior of Zn–Al coating. Design/methodology/approach A Zn–Al coating was fabricated on Q235A steel using a Dacromet method. The SSC and electrochemical corrosion performances in 3.5 Wt.% NaCl solution were investigated using an SSC chamber and electrochemical workstation, respectively, and the corrosion mechanism of Zn–Al coating was discussed. Findings The Dacromet fabricated Zn–Al coating is primarily composed of Zn and Al phases, its residual stress of −11.1 ± 4 MPa is compressive stress, which is beneficial to improve its corrosion resistance. In the SSC process, the corrosion product of Zn5(OH)8Cl2H2O enhances the corrosion resistance of Zn–Al coating, which provides sufficient cathodic protection for the substrate. The corrosion potential of Zn–Al coating is lower than that of substrate, which provides sufficient cathodic protection to the substrate, the Zn–Al coating in the immersion periods is protected by the corrosion product and Zn–Al sheets. Originality/value In this study, a Zn–Al coating was first fabricated on Q235A steel using a Dacromet method.

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Effect of fluxing chemical: An option for Zn–5wt.%Al alloy coating on wire surface by single hot dip process

Cited by 25 publications

References 11 publications

Microstructure and Corrosion Behavior of ZnAl12Mg3Si0.3 Double-Batch Hot-Dip Coatings

Microstructure and Corrosion Behavior of ZnAl12Mg3Si0.3 Double-Batch Hot-Dip Coatings

Wetting of liquid Zinc-aluminum-magnesium alloy on steel substrate during hot-dipping: Understanding the role of the flux

Salt spray corrosion and electrochemical corrosion performances of Dacromet fabricated Zn–Al coating

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