Microstructural investigation and corrosion behavior of hot-dipped Al-Si-Mg-Cu alloy coated steel

Pradhan, Debabrata; Mondal, Avik; Chakraborty, Anindita; Manna, M.; Dutta, Moumita

doi:10.1016/j.surfcoat.2019.07.047

Cited by 14 publications

(7 citation statements)

References 52 publications

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“…Their XRD studies yielded several new and interesting observations, such as the presence of elemental Si, Mg 2 Si, Al 3 FeSi 2 (τ 4 ), and Al 2 FeSi (τ 3 ) phases. It may be mentioned that τ 3 and τ 4 have been reported elsewhere as high-temperature phases that are detected after annealing [87,92,130,133]. EPMA phase mapping in this investigation confirmed that Mg had been mostly associated with Si across the depth of the matrix, indicating the formation of Mg 2 Si compounds in line with the observation of Tsuru [128].…”

Section: Studies On Steel Specimen After Dipping In Al-si-x Alloy Bat...supporting

confidence: 84%

A review on metallurgical features of hot-dip aluminized steel

et al. 2023

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Among the various surface modification processes, the hot-dip aluminizing process has increasingly evoked considerable attention. This method has proved to be commercially cost-effective and technically better than galvanizing. In contrast to hot-dip aluminized steel components, galvanized components cannot be used in service conditions at elevated temperatures. During the last few years, intensive research by researchers has yielded new insights into metallurgical aspects of aluminized coating in as-dipped and annealed condition. The present review gives a bird’s eye view of the hot-dip aluminizing process, from the early years of its inception to the current research on aspects of the aluminized coating. The progress of research on thermodynamic studies, phase equilibria, phase identification, and their crystallographic features have been traced in this attempt. This review is not restricted to briefing the research performed so far but also points out several issues of discrepancies among the results of the published literature. Special emphasis has been given to the phase development in the coating during annealing and the increasing horizon of application of hot-dip aluminizing to alloy steels in hot stamped conditions. Reference has also been made to state-of-the-art topics embracing the current research on computer simulation software and sophisticated experimental techniques. However, lower surface hardness and economy restrict the wide application of the hot-dipping process.

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Section: Studies On Steel Specimen After Dipping In Al-si-x Alloy Bat...supporting

confidence: 84%

A review on metallurgical features of hot-dip aluminized steel

et al. 2023

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“…11. The linearity of the plot confirms that the growth kinetics of Al 8 Fe 2 Si layer follows the parabolic rate equation through a diffusion controlled process consistent with our previous investigation (Ref 23). Therefore, the following rate expression can be used to represent growth kinetics of Al 8 Fe 2 Si phase.…”

Section: Growth Kinetics Of Al 8 Fe 2 Si Intermetallic Layersupporting

confidence: 88%

“…Tsuru ) investigated the formation of various phases and compounds during hot-dipping of Interstitial-free (IF) steel in Al-6.9% Si-1.4% Mg alloy at 800°C but the corrosion property and performance was not reported. Other systems such as Al-Mg-Mn and Al-Si-Mg-Cu alloy coatings showed promising corrosion properties compare to GI ( Ref 22,23). Commercially available Al-Zn coating (Galvalume Ò , 55 wt.% Al, 43 wt.% Zn, and 1.5 wt.% Si) contains approximately 80 vol.% dendritic Al-rich phase, 20 vol.% Zn-rich interdendritic phase and distributed Si phase (Ref [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Corrosion Resistance Evaluation of Hot-Dipped Al-Zn-Si Alloy-Coated Steel

Pradhan

Mondal

Chakraborty

2021

J. of Materi Eng and Perform

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The article describes a novel Al-Zn-Si alloy hot-dip coating on steel, coating characterization and performance evaluation. Cross-sectional SEM micrographs showed that the coating consists of two layers-thick Al-Zn-Si alloy layer on the top and a thin Al-Fe-Si intermetallic layer underneath toward the interface. The outer Al-Zn-Si alloy layer is composed of primary aluminum-rich (a-Al) dendrites along with uniform distribution of Si. EDS and XRD analysis identified Al-Fe-Si intermetallic layer as Al 8 Fe 2 Si phase. Potentiodynamic polarization study displayed superior corrosion properties of the coating compared to commercial aluminized steels. Corrosion rate (in mpy) was found to be six times lower compared to galvanized coating with a similar corrosion potential. Furthermore, salt spray test life of coating more than 2000h confirmed superior corrosion properties than GI coating.

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“…However, if the surface of the steel was coated with a layer of Cu, the corrosion of the steel would also be fundamentally inhibited, and this is a simple and efficient solution. Based on this concept, the simple processes of copper coating on steel, such as electrodeposition, hot dipping, and mechanical extrusion cladding, have been used to protect the steel [10][11][12][13][14][15][16][17]. However, these processes have a fatal flaw.…”

Section: Introductionmentioning

confidence: 99%

Research on the Diffusion Behavior of Cu in Low-Carbon Steel under High Temperatures

et al. 2022

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The effective diffusion of Cu in Fe is the key to forming a stable transition layer between copper and low-carbon steel, but it is seriously affected by several factors, especially temperature, and the diffusion of Cu can only be completed at high temperatures. In order to analyze the diffusion coefficient of Cu in low-carbon steel under high temperatures, and to obtain the best diffusion temperature range of Cu in steel, the electrodeposition method was used to prepare the diffusion couple of copper and low-carbon steel, which would be annealed under different temperatures for 6 h; meanwhile, the MD models were also used to analyze the diffusion behavior of Cu in Fe at different temperatures. The results show that the diffusion of Cu in low-carbon steel could be realized by high-temperature annealing, and as the temperature increases, the thickness of the Cu/low-carbon steel transition layer shows an increasing trend. When the annealing temperature is between 900 °C and 1000 °C, the thickness of the transition layer increases the fastest. The results of the MD models show that, when the temperature is in the phase transition zone, the main restrictive link for the diffusion of Cu in Fe is the phase transition process of Fe; additionally, when the temperature is higher, the main restrictive link for the diffusion of Cu in Fe is the activity of the atom.

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Microstructural investigation and corrosion behavior of hot-dipped Al-Si-Mg-Cu alloy coated steel

Cited by 14 publications

References 52 publications

A review on metallurgical features of hot-dip aluminized steel

A review on metallurgical features of hot-dip aluminized steel

Microstructural and Corrosion Resistance Evaluation of Hot-Dipped Al-Zn-Si Alloy-Coated Steel

Research on the Diffusion Behavior of Cu in Low-Carbon Steel under High Temperatures

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