Inhibitory effect of Ti and La on Fe dissolution in Al–Zn–Si bath by in-situ SXRD, SXRF, TEM and DFT calculation

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.08.038· OSTI ID:22805846

Liu, Wei ^[1]; Gu, Qinfen ^[2]; Liu, Bin ^[1]; Wang, Binjun ^[3]; Luo, Qun; Zhang, Jieyu ^[1]; Wang, Yongming; Li, Qian ^[1]

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1. State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering & Materials Genome Institute & Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, 99 Shangda Road, Shanghai 200444 (China)
2. Australian Synchrotron (ANSTO), 800 Blackburn Rd, Clayton 3168, VIC (Australia)
3. School of Materials Science and Engineering, Shanghai Institute of Technology, 100 Haiquan Rd, Shanghai 201418 (China)

Highlights: • In-situ synchrotron X-rays diffraction was used to study the solid-liquid reaction. • The addition of Ti and La suppresses the dissolution of Fe in the reaction. • A new quaternary phase was found in the hot-dip coated sheets. • The formation of the quaternary phase needed an enrichment of Si from bath. • The continuous formation of dross probably caused by the initial dissolution - Abstract: During the hot-dipping process, there is always a desire to restrain the mutual diffusion between steel and alloy bath for suppressing the formation of bath dross. However, the dissolution of steel sheets is difficult to quantify by the traditional methods. In this work, in-situ X-ray diffraction was used to investigate the solid-liquid reaction between solid Fe and Al–Zn–Si liquid alloy for quantitatively analyzing the consumption of Fe and the formation of Fe–Al compounds. The results indicated that the addition of trace Ti or La could suppress the mutual diffusion. We also observed the microstructures of the Fe–Al intermetallic multilayers and the distribution of Ti or La in the multilayers. A new quaternary phase was identified. The inhibitory effects of Ti and La were also explained by calculating the diffusion barrier energies with density functional theory.

• OSTI ID: 22805846
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 145; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
DENSITY FUNCTIONAL METHOD
DISSOLUTION
DISTRIBUTION
HOT DIPPING
INTERMETALLIC COMPOUNDS
IRON
LANTHANUM ADDITIONS
LAYERS
LIQUID METALS
MICROSTRUCTURE
SILICON COMPOUNDS
SOLIDS
STEELS
TERNARY ALLOY SYSTEMS
TITANIUM ADDITIONS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZINC COMPOUNDS