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Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer and preparation method thereof

A technology of intermetallic compounds and corrosion-resistant layers, which is applied in the coating process and coating of metal materials, can solve the problems of general high-temperature corrosion resistance, improve high-temperature corrosion resistance, and solve serious high-temperature corrosion problems.

Inactive Publication Date: 2012-08-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The austenitic heat-resistant steel is characterized by higher high-temperature strength and better high-temperature oxidation resistance, but its high-temperature corrosion resistance in an oxidizing environment containing chlorine is average.

Method used

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  • Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer and preparation method thereof
  • Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer and preparation method thereof
  • Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Weigh 5 grams of aluminum powder (100-200 mesh particle size, purity ≥99.5%) and 95 grams of titanium powder (100-200 mesh particle size, purity ≥99.5%), and mix them in a powder mixer for 20 minutes. Prepare the mixed powder into a paste, and apply it on a 20 g pearlitic heat-resistant steel substrate with a geometric size of 100 mm × 200 mm × 3 mm for degreasing and derusting, and control the thickness of the coating layer to about 0.5 mm. After the coating is dried, place it on the cladding workbench. The laser working head connected to the optical fiber is used to move horizontally at a uniform speed and the workpiece is fixed. The titanium-aluminum mixed powder and the pearlite heat-resistant steel matrix are directly synthesized in situ by laser heating to form iron-rich Fe-Ti and Fe-Al. Multi-phase intermetallic compound corrosion resistance layer, the corrosion resistance layer is made of iron-rich Fe 2 Ti and Fe 3 It is composed of Al complex phase intermetal...

Embodiment 2

[0016] Weigh 10 grams of aluminum powder (100-200 mesh particle size, purity ≥99.5%) and 90 grams of titanium powder (100-200 mesh particle size, purity ≥99.5%) and mix them in a powder mixer for 20 minutes. Prepare the mixed powder into a paste, and apply it on a 20 g pearlitic heat-resistant steel substrate with a geometric size of 100 mm × 200 mm × 3 mm for degreasing and derusting, and control the thickness of the coating layer to about 0.5 mm. After the coating is dried, place it on the cladding workbench. The laser working head connected to the optical fiber is used to move horizontally at a uniform speed and the workpiece is fixed. The titanium-aluminum mixed powder and the pearlite heat-resistant steel matrix are directly synthesized in situ by laser heating to form iron-rich Fe-Ti and Fe-Al. Multi-phase intermetallic compound corrosion resistance layer, the corrosion resistance layer is made of iron-rich Fe 2 Ti and Fe 3 It is composed of Al complex phase intermetal...

Embodiment 3

[0018] Weigh 20 grams of aluminum powder (100 mesh to 200 mesh, purity ≥ 99.5%) and 80 grams of titanium powder (100 mesh to 200 mesh, purity ≥ 99.5%), put them into the powder mixer and mix for 20 minutes. Prepare the mixed powder into a paste, and apply it on a 20 g pearlitic heat-resistant steel substrate with a geometric size of 100 mm × 200 mm × 3 mm for degreasing and derusting, and control the thickness of the coating layer to about 0.5 mm. After the layer is dried, place it on the cladding workbench. The laser working head connected to the optical fiber is used to move horizontally at a uniform speed and the workpiece is fixed. The titanium-aluminum mixed powder and the pearlite heat-resistant steel matrix are directly synthesized in situ by laser heating to form iron-rich Fe-Ti and Fe-Al. Multi-phase intermetallic compound corrosion resistance layer, the corrosion resistance layer is made of iron-rich Fe 2 Ti and Fe 3 It is composed of Al complex phase intermetallic...

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Abstract

The invention discloses an Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer and a preparation method thereof and belongs to the field of surface engineering. The anti-corrosion layer is the iron-rich Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer which is generated in situ by adopting laser treatment technology on pearlite heat-resistant steel. The anti-corrosion layer is prepared according to the method which comprises the following steps: firstly, performing oil-removing and de-rusting treatment on a pearlite heat-resistant steel substrate, and then forming the iron-rich Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer in situ on the pearlite heat-resistant steel substrate by titanium aluminum powder mixture through laser. By designing the iron-rich Fe-Ti and Fe-Al complex-phase intermetallic compound anti-corrosion layer by the invention, on one hand, the high-temperature corrosion resistance under high-temperature chloric oxidation condition is obviously increased in comparison with an aluminum-rich Fe-Al intermetallic compound anti-corrosion layer, on the other hand, a more effective anti-corrosion layer for resisting biomass ash high-temperature corrosion is supplied for solving the problem of serious high-temperature corrosion of a boiler overheat pipe.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a Fe-Ti and Fe-Al multiphase intermetallic compound corrosion-resistant layer and a preparation method thereof. Background technique [0002] Biomass power generation is one of the important means and ways to develop low-carbon economy and circular economy. In order to improve the power generation efficiency of biomass power plants, my country has produced and operated high-temperature and high-pressure biomass boilers (steam temperature 540 °C, steam pressure 9.2 MPa). However, with the increase of steam parameters, the problem of severe corrosion of superheater tubes of biomass boilers appeared. This is because the yellow straw and gray straw burned by the biomass boiler contain relatively high alkali metal chlorides, which release chlorine-containing low-melting substances during the combustion process, resulting in serious slagging on the heating surface of the s...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 刘东雨刘菲燕侯世香袁晓娜刘静静
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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