Preparation method for corrosion-resistant coating of nickel-aluminum based intermetallic compound

A corrosion-resistant coating and base metal technology, applied in the field of material science, can solve the problems of large loss of mixed powder, many coating voids, and non-denseness, and achieve high bonding strength and high economic value.

Inactive Publication Date: 2013-02-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned methods for preparing intermetallic compound coatings, there are various defects such as large loss of mixed powder, uneven coating thickness, too many voids in the coating and not dense, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Ni powder (200 mesh, purity 99%) and Al powder (200 mesh, purity 99.5%) are evenly mixed with anhydrous ethanol according to the molar ratio of Ni powder 50% and Al powder 50%, and evenly coated on the treated On the carbon steel substrate (the surface roughness of carbon steel is Ra50), the thickness should exceed 10mm, and then put it into a resistance heating furnace for heating, the heating rate is 10°C / min, and the temperature is raised to 200°C for 2 hours to dry the mixed powder . Raise the temperature in the furnace to 600°C to ignite the thermal explosion in-situ reaction, and keep the temperature at 200°C for 1 hour after the reaction is completed.

[0034] After the reaction, the surface of the resulting coating is polished to obtain a coating with a smooth surface, a dense structure, and a uniform thickness.

Embodiment 2

[0036] Ni powder (200 mesh, purity 99%) and Al powder (200 mesh, purity 99.5%) are evenly mixed with anhydrous ethanol according to the molar ratio of Ni powder 75% and Al powder 25%, and evenly coated on the treated On the carbon steel substrate (the surface roughness of carbon steel is Ra100), the thickness should exceed 10mm, and then put it into a resistance heating furnace for heating, the heating rate is 10°C / min, and the temperature is raised to 200°C for 2 hours to dry the mixed powder . Raise the temperature in the furnace to 600°C to ignite the thermal explosion in-situ reaction, and keep the temperature at 200°C for 1 hour after the reaction is completed.

[0037] After the reaction, the surface of the resulting coating is polished to obtain a coating with a smooth surface, a dense structure, and a uniform thickness.

Embodiment 3

[0039] Ni powder (200 mesh, purity 99%) and Al powder (200 mesh, purity 99.5%) are evenly mixed with anhydrous ethanol according to the molar ratio of Ni powder 66% and Al powder 34%, and evenly coated on the treated On the carbon steel substrate (the surface roughness of carbon steel is Ra75), the thickness should exceed 10mm, and then put it into a resistance heating furnace to heat at a heating rate of 10°C / min, and heat it up to 200°C for 2 hours to dry the mixed powder . Raise the temperature in the furnace to ignite the thermal explosion in-situ reaction at 600°C, and keep the temperature at 200°C for 1 hour after the reaction is completed.

[0040] After the reaction, the surface of the resulting coating is polished to obtain a coating with a smooth surface, a dense structure, and a uniform thickness.

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Abstract

The invention belongs to the technical field of material science, and relates to a preparation method for a corrosion-resistant coating of a compact nickel-aluminum (Ni-Al) based intermetallic compound which is synthesized by the in-situ heat explosion on the surface of carbon steel. The preparation method comprises the following steps of: firstly, preparing Ni powder and Al power according to the mole percentage that the Ni powder is 50-75%, and the Al powder is 25-50%, and evenly mixing with absolute ethyl alcohol; and drying on the basis of wet-process even mixing, stimulating the in-situ thermal explosion reaction in a heating furnace with the temperature being 550-600DEG C so as to generate a Ni-Al base intermetallic compound coating on the carbon steel base body. The coating prepared by the method is compact in interior structure and free from pores, and is higher in bonding strength when being metallurgically boned with the carbon steel base body. The preparation method is a coating preparation technology which is high in economic value, and can be widely applicable to the preparation of a protective coating resisting high temperature corrosion.

Description

technical field [0001] The invention belongs to the field of material science and technology, and relates to a method for preparing a dense nickel-aluminum (Ni-Al)-based intermetallic compound corrosion-resistant coating on the surface of carbon steel by in-situ thermal explosion. Background technique [0002] Nickel-aluminum (Ni-Al) intermetallic compounds have excellent high-temperature comprehensive properties, especially high-temperature oxidation and hot corrosion resistance. Therefore, Ni-Al intermetallic compounds are actually a high-temperature protective coating material with high application value. In a high temperature environment, Ni-Al intermetallic compounds can easily form a continuous, stable and dense aluminum oxide protective film on the surface, which greatly improves the oxidation and corrosion resistance of the material. The Ni-Al intermetallic compound is used as the surface coating material to give full play to the performance advantages of the interme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 袁建军张希华刘欣颖郭凡灿
Owner SHANDONG UNIV
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