The Microstructure and Corrosion Resistance of Fe-B-W-Mn-Al Alloy in Liquid Zinc

Zixiang Luo; Ke Liu; Zizhen Cui; Xuemei Ouyang; Chen Zhang; Fucheng Yin

doi:10.3390/ma15031092

The Microstructure and Corrosion Resistance of Fe-B-W-Mn-Al Alloy in Liquid Zinc

Materials (Basel). 2022 Jan 30;15(3):1092. doi: 10.3390/ma15031092.

Authors

Zixiang Luo^{1

2}, Ke Liu³, Zizhen Cui^{1

2}, Xuemei Ouyang^{1

2}, Chen Zhang³, Fucheng Yin^{1

2}

Affiliations

¹ School of Material Science and Engineering, Xiangtan University, Xiangtan 411105, China.
² Key Laboratory of Materials Design and Preparation Technology of Hunan Province, School of Material Science and Engineering, Xiangtan University, Xiangtan 411105, China.
³ Jianglu Machinery and Electronics Group Co., Ltd., Xiangtan 411100, China.

Abstract

The microstructure, interfacial characteristics, and corrosion resistance of Fe-W-Mn-Al-B alloys in molten zinc at 520 °C have been investigated using scanning electron microscopy (SEM), X-ray diffractometry (XRD), and electron probe micro-analysis (EPMA). The experimental results indicate that the Fe-B alloy with 11 wt.% W, 7 wt.% Mn, and 4 wt.% Al addition displays a lamellar eutectic microstructure and excellent corrosion resistance to molten zinc. The toughness of M₂B-type borides in the hyper-eutectic Fe-4.2B-11W-7Mn-4Al alloy can be more than doubled, reaching 10.5 MPa·m^1/2, by adding Mn and Al. The corrosion layer of the Fe-3.5B-11W-7Mn-4Al alloy immersed in molten zinc at 520 °C comprises Fe₃AlZn_x, δ-FeZn₁₀, ζ-FeZn₁₃, and η-Zn. The lamellar borides provide the mechanical protection for α-(Fe, Mn, Al), and the thermal stability of borides improves as the fracture toughness of the borides increases, which jointly contribute to the improvement of the corrosion resistance to the molten zinc.

Keywords: Fe-B-W alloy; aluminum; corrosion; manganese; microanalysis; molten zinc.

Abstract

Grants and funding