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

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 interme