Anti-fusion aluminum silicon alloy corrosion composite coating layer and preparation method and application thereof

A composite coating, aluminum-silicon alloy technology, applied in the field of corrosion coating, can solve the problems of coating torsion resistance, poor shear resistance, weak interface bonding force, coating cracking, etc., to achieve strong step coverage, The interface stress and tissue defects are small, and the effect of blocking diffusion

Active Publication Date: 2019-06-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Patent application number 201010126852.7 discloses a solar thermal power generation anti-corrosion gradient protective coating of molten aluminum-silicon alloy and its preparation method. The MoB / CoCr gradient protective coating is prepared by low-pressure plasma spraying. This method can improve the heat resistance of the coating. Impact performance, but the interface with the substrate is not strong, easy to peel off
The patent application number is 201711388751.5, which discloses a preparation method of internal heating evaporation blue with aluminum liquid corrosion resistant composite ceramic coating. The patent uses thermal spraying technology to spray 0.8-1.5mm composite structure Al 2 o 3 -8YSZ corrosion-resistant layer, the composite coating does not wet the molten metal liquid, and has the advantage of heat corrosion resistance, but the coating is not well bonded to the substrate and the particle layer, making the coating poor in torsion and shear resistance ; and the coating prepared by thermal spraying method is relatively thick, and the continuous increase of the internal stress of the coating will easily lead to problems such as cracking and falling off of the coating

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  • Anti-fusion aluminum silicon alloy corrosion composite coating layer and preparation method and application thereof
  • Anti-fusion aluminum silicon alloy corrosion composite coating layer and preparation method and application thereof

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[0038] A preparation method of the anti-corrosion coating of molten aluminum-silicon alloy of the present invention, comprising the following steps:

[0039] S1. Surface treatment of iron-based alloys, and then aluminized with solid powder infiltration agent;

[0040] S2. Sandblast the iron-based alloy after aluminizing;

[0041] S3, washing and drying the sandblasted iron-based alloy;

[0042] S4, using atomic layer vapor deposition method to deposit TiO on the surface of the dried aluminized iron-based alloy2 film layer.

[0043] In this solution, the iron-based alloy is an alloy plate, preferably an austenitic stainless steel alloy.

[0044] Between the step S3 and the step S4, it also includes depositing Al on the surface of the aluminized iron-based alloy obtained in the step S3 by using the atomic layer vapor deposition method 2 O 3 Thin film layer, Al introduced by this method 2 O 3 The thin film layer is dense and uniform, and can strengthen the isolation effect ...

Embodiment 1

[0056] An anti-corrosion composite coating of molten aluminum-silicon alloy of the present invention, the composite coating sequentially includes an aluminized layer, an Al 2 O 3 Thin film layers and TiO 2 film layer. where Al 2 O 3 Thin film layers and TiO 2 The thin film layers are all introduced by atomic layer vapor deposition, Al 2 O 3 Thin film layers and TiO 2 The thickness of the thin film layer is 5nm and 20nm in turn; the aluminized layer includes Fe(Al) phase diffusion layer, Fe-Al compound layer and Al in turn from the surface of the substrate to the outside. 2 O 3 Floor. Among them, Fe(Al) phase diffusion layer, Fe-Al compound layer and Al 2 O 3 The layers are all micron thickness.

[0057] A preparation method of the anti-corrosion composite coating of molten aluminum-silicon alloy of the present embodiment includes the following steps:

[0058] (1) Surface mechanical polishing: The hot-rolled austenitic stainless steel plate samples are polished wit...

Embodiment 2

[0065] A kind of anti-corrosion composite coating of molten aluminum-silicon alloy of the present invention, described composite coating comprises aluminized layer, Al 2 o 3 Thin film layer and TiO 2 film layer. where Al 2 o 3 Thin film layer and TiO 2 The thin film layers are all introduced by atomic layer vapor deposition method, Al 2 o 3 Thin film layer and TiO 2 The thickness of the film layer is 30nm and 50nm in turn; the aluminized layer includes Fe(Al) phase diffusion layer, Fe-Al compound layer and Al 2 o 3 Floor. Among them, Fe(Al) phase diffusion layer, Fe-Al compound layer and Al 2 o 3 The layers are all micron-scale thickness.

[0066] A preparation method of the molten aluminum-silicon alloy corrosion-resistant composite coating of this embodiment comprises the following steps:

[0067] (1) Surface mechanical polishing: The hot-rolled plate austenitic stainless steel sample is polished with sandpaper of different particle sizes (80 mesh to 1200 mesh) ...

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Abstract

The invention discloses an anti-fusion aluminum silicon alloy corrosion composite coating layer and a preparation method and application thereof. The composite coating layer comprises an aluminum permeating layer and a TiO2 film layer from the surface of a basal body to the external in sequence. The preparation method of the coating layer comprises the following steps: (S1) the surface of an ironbase alloy is treated; and then, a solid powder permeating agent is adopted to permeate aluminum; (S2) sand is blasted to the iron base alloy after aluminum permeation; (S3) the iron base alloy is washed and dried after sand blasting; and (S4) a TiO2 film layer is deposited on the surface of the dried iron base alloy after aluminum permeation by adopting an atomic layer vapor deposition method. The composite coating layer is uniform in structure, low in internal stress, tight in combination and small in porosity, can separate the combination between fused metal and the basal body, is excellentin corrosion resistance of an anti-fusion aluminum silicon alloy, and can be applied to solar heat power generation heat exchange tubes.

Description

technical field [0001] The invention relates to the technical field of corrosion coatings, in particular to a composite coating with excellent corrosion resistance to molten aluminum-silicon alloys and a preparation method and application thereof. Background technique [0002] Traditional fossil energy has been unable to meet the needs of global population growth and rapid industrialization, so the application of renewable energy has received close attention from governments around the world. Compared with other renewable energy power generation technologies, solar thermal power generation has the advantages of heat storage, peak adjustment, and continuous power generation, and is developing towards the goal of high light-to-heat conversion efficiency, low cost and long life. Among them, high temperature heat storage material is the core link to improve the operation efficiency of solar thermal power generation system. At present, commercial solar thermal power stations mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/50C23C10/60C23C16/40C23C16/455C23C28/00
CPCC23C10/50C23C10/60C23C28/321C23C28/345C23C10/48C23C16/45525C23C16/403C23C16/405C23C16/0272C23C16/0227C23C16/45529C23C24/08C23C28/3455
Inventor 李微赵祎林陈荐任延杰何建军陈建林
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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