On the distribution of the trace elements V and Cr in an Al–Zn–Si alloy coating on a steel substrate

Qu, Dingrong; Gear, Matthew; Setargew, Nega; Renshaw, Wayne; McDonald, Stuart D.; StJohn, David H.; Paterson, D.; Nogita, Kazuhiro

doi:10.1016/j.mtla.2020.100669

Cited by 2 publications

(4 citation statements)

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“…The synchrotron XRD in the current study confirms that τ5c is also the dominant IMC in the dross particles formed in the hot liquid bath in the production line. It should be noted that the τ5c has a large solubility of Zn and other elements [ 3 , 4 , 5 , 6 , 18 , 19 , 20 ], which can be stable in the liquid bath and down to room temperature. The identification of the τ5c bcc lattice demonstrates that there are two bcc lattices of different sizes for the τ5c in the currently studied dross particles.…”

Section: Resultsmentioning

confidence: 99%

“…The environment of those tested dross particles is different from those in the molten alloy bath where the τ5c particles are most likely in equilibrium with the liquid Zn-55wt%Al-1.6wt%Si alloy at 600 °C. The presence of transition metal trace elements in an industrial molten alloy bath may change the τ5c particles in some way, as inferred by the segregation of Cr and V to the IMC layer on the steel strip [ 5 ]. Therefore, the chemical homogeneity is critical to controlling the dross formation in the liquid bath during hot-dip galvanizing.…”

Section: Resultsmentioning

confidence: 99%

“…The Zn-55wt%Al-1.6wt%Si alloy has been used to coat steel sheets for protection against aqueous corrosion, where a multilayered microstructure (steel substrate/intermetallic compound (IMC) layer/coating overlay) is formed [ 1 , 2 , 3 , 4 , 5 ]. Industry has traditionally manufactured this coating by using the continuous hot-dip galvanizing process [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…With Si involved in the Al-Fe system, additional Al-Fe-Si IMCs were also reported and documented in reference [ 14 ]. It was found that in the 55%Al-Zn coating alloy τ5c-Al 20 Fe 5 Si 2 (+Zn) (of cubic crystal unit cell) is the single phase that constitutes the IMC layer as well as the dominant phase component of the dross in the liquid bath [ 5 ]. The τ5 IMC in the ternary Al-Fe-Si alloy system is usually denoted as Al 8 Fe 2 Si and has a hexagonal close-packed (hcp) lattice structure [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Phase Stability of Dross Particles in Hot-Dip Zn-55wt%Al-1.6wt%Si Galvanizing Bath

Gear

et al. 2023

Materials

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Dross in a Zn-55wt%Al-1.6wt%Si metal coating bath is a mixture of bath metal and the quaternary intermetallic phase τ5c-Al20Fe5Si2(+Zn). Understanding the properties and formation of dross in a hot-dip Al-Zn galvanizing bath at the processing temperature (~600 °C) is critical for improving the production quality of steel sheet coating. However, dross analysis is usually conducted at room temperature with dross samples taken from the hot-dip bath and it is not known how representative these samples are of the phase(s) existing at high temperature. Using in-situ synchrotron X-ray diffraction (XRD), the crystal lattice and the coefficient of thermal expansion (CTE) of the intermetallic phase have been determined in the temperature range of 30 °C to 660 °C. Phase formation and phase stability of the intermetallic phase in the dross powder have been determined, providing fundamental knowledge for optimizing the production and quality of steel sheet coating.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%