Study on Long - Term Hot Dipping Behavior of 316L Stainless Steel in Zn - 5%Al Alloy Melt

WANG Banglin, LIAO Xingli, KE Yongjun, LU Chenghong, YAN Caimin, LAI Delin, CENG Faming, CHE Chunshan

doi:10.16577/j.issn.1001-1560.2022.0307

Materials Protection >

2022 , Vol. 55 >Issue 11: 50 - 55

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0307

Study on Long - Term Hot Dipping Behavior of 316L Stainless Steel in Zn - 5%Al Alloy Melt

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(1. Wenzhou Taichang Steel Tower Manufacturing Co., Ltd., Wenzhou 325013, China;2. School of Materials, South China University of Technology, Guangzhou 510640, China)

Received date: 2022-06-24

Revised date: 2022-07-26

Accepted date: 2022-08-23

Online published: 2023-12-25

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Abstract

With the aim of researching the long - term hot dipping behavior of 316L stainless steel in Zn - 5% (mass fraction, the same below) Al alloy melt at 450 ℃, the formation and growth rules of intermetallic compounds at the interface between Zn - Al alloy melt and stainless steel substrate were analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X - ray diffractometer (XRD) and electrochemical stripping method. Results showed that during the long - term immersion process, the interface between Zn - Al alloy melt and the stainless steel substrate always maintained a dense and continuous phase layer of intermetallic compound Fe4Zn13 (FeAl3). The thickness of the layer increased with the prolongation of the immersion time, but when the hot dipping time exceeded 240 h, the growth and dissolution of the layer achieved a dynamic equilibrium. Furthermore, the Cr and Ni elements in stainless steel had a stabilizing effect on the FeAl3 phase layer. A continuously dense and stable intermetallic compound layer was the essential reason for the good corrosion resistance of 316L stainless steel in Zn - 5%Al alloy melt.

Key words： 316L stainless steel; hot dipping; intermetallic compound; phase structure; zinc aluminum alloy melt

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WANG Banglin, LIAO Xingli, KE Yongjun, LU Chenghong, YAN Caimin, LAI Delin, CENG Faming, CHE Chunshan . Study on Long - Term Hot Dipping Behavior of 316L Stainless Steel in Zn - 5%Al Alloy Melt[J]. Materials Protection, 2022 , 55(11) : 50 -55 . DOI: 10.16577/j.issn.1001-1560.2022.0307

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