Multilayer composite ceramic coating used for hot-dip zinc galvanization, and preparation method of the multilayer composite ceramic coating
A multi-layer composite and ceramic coating technology, which is applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve problems such as poor mechanical properties and thermal conductivity, poor liquid zinc corrosion resistance, and low material life , to achieve good thermal conductivity and thermal shock resistance, good resistance to liquid zinc corrosion, and high thermal shock resistance
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Embodiment 1
[0066] This embodiment is used for the multilayer composite ceramic coating of hot-dip galvanizing, and its matrix material is Q235 common carbon steel, is the bottom layer with the microcrystalline self-fluxing alloy layer of Fe-Al, and the thickness of this bottom layer is 100 μ m, uses Al- Fe 2 o 3 Ceramic-based nanocrystalline ceramic-metal composite layer n-(Fe 1-x al x )(Fe x al 2-x )O 4 -Fe-Al 2 o 3 It is the intermediate transition layer, the thickness of the intermediate transition layer is 400μm, ZrO with ceramic glass sealing 2 The oxide ceramic layer is the working layer, and the thickness of the working layer is 200 μm, thereby constituting a multi-layer composite ceramic coating for hot-dip galvanizing, wherein the underlying alloy has a micro-crystalline structure, and the ceramic-metal complex phase intermediate transition The layer is a nanocrystalline structure, and the oxide ceramic working layer sealed by ceramic glass is a microcrystalline + amorp...
Embodiment 2
[0094] Except for adopting Q195 ordinary carbon steel as the base material of the multilayer composite ceramic coating, the others are the same as in Embodiment 1.
[0095] Figure 9 It is the SEM photograph of the cross-section of the multilayer composite ceramic coating for hot-dip galvanizing in this embodiment. It can be seen from this figure that the multilayer composite ceramic coating is composed of Fe-Al layer alloy bottom layer, complex phase iron-aluminum spinel (Fe 1-x Al x )(Fe x Al 2-x )O 4 -Fe-Al 2 o 3 Intermediate transition layer, ZrO sealed by ceramic glass sealing layer 2 Composed of ceramic working layers, the sub-layers in the coating are well bonded.
[0096] Figure 10 It is the XRD line of the bottom layer of the Fe-Al microcrystalline self-fluxing alloy layer of this embodiment. It can be seen from the XRD spectrum that the bottom layer is made of Fe 2 Al 5 、FeAl 2 And AlFe phase composition. These phases are all Fe-Al intermetallic compo...
Embodiment 3
[0106] Except for adopting Q235-B ordinary carbon steel as the base material of the multilayer composite ceramic coating, the others are the same as in Example 1.
[0107] Figure 16 It is the SEM photo of the cross-section of the hot-dip galvanized multilayer composite ceramic coating in this embodiment. It can be seen from the figure that the bottom layer, the intermediate transition layer, and the working layer sealed by the sealing layer inside the multilayer composite ceramic coating on the substrate are well combined with each other.
[0108] Figure 17 It is the XRD line of the bottom layer of the Fe-Al microcrystalline self-fluxing alloy layer of this embodiment. It can be seen from the XRD spectrum that the bottom layer is made of Al which is resistant to liquid zinc corrosion, high temperature oxidation resistance and good thermal conductivity. 5 Fe 2 、FeAl 2 And AlFe phase composition. These phases are all Fe-Al intermetallic compounds, which not only have cer...
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