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Thermally-grown Cr2O3 or Al2O3 film type M-Cr-Al nano composite coating and method for preparing same and application thereof

A nano-composite and composite coating technology, applied in coatings, electrolytic coatings, etc., to achieve the effect of improving high temperature and oxidation resistance, low cost, and improving coating performance

Inactive Publication Date: 2010-07-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research progress in this area is not large, and the key factor is that the added metal powder or alloy powder is micron-sized.
This kind of composite coating prepared by traditional metal-metal particle (micron-scale) co-electrodeposition has the following disadvantages: (1) The amount of Cr and Al is difficult to control, and the composite amount cannot reach the formation of protective Cr2O3 or Al2O3The critical value required for the oxide film, (2) High porosity

Method used

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  • Thermally-grown Cr2O3 or Al2O3 film type M-Cr-Al nano composite coating and method for preparing same and application thereof
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  • Thermally-grown Cr2O3 or Al2O3 film type M-Cr-Al nano composite coating and method for preparing same and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment introduces the preparation and performance of Ni-Cr-Al nanocomposite coating, and its preparation method is to adopt conventional co-electrodeposition (composite electroplating) technology to prepare Ni-Cr-Al nanocomposite coating; Plating solution is to use sodium citrate as The sulfate system of the complexing agent, Cr powder and Al powder are all nano-sized. Present embodiment will be described in detail with the preparation of Ni-Cr-Al nanocomposite coating and result example, and Fig. 1-1, 1-2 are the transmission electron microscope (TEM) morphology of nano-Cr powder and Al powder used in this experiment, As can be seen from the figure, the average particle sizes of the nano-Cr powder and Al powder used are 60nm and 85nm respectively (the particle size ranges of the nano-Cr powder and Al powder in the present invention are respectively 14-89nm, 16-100nm).

[0037] The process of preparing Ni-Cr-Al nanocomposite coating in this embodiment is as fol...

Embodiment 2

[0047] This embodiment provides thermally grown Cr 2 o 3 Properties and morphology of film-type Ni-Cr-Al nanocomposite coatings and Ni-Cr and Ni-Al nanocomposite coatings oxidized in air at 900°C for 24h (preparation method is the same as above). Specifically, Ni-11Cr-3Al, Ni-11Cr and Ni-3Al nanocomposite coatings are taken as examples.

[0048] The high-temperature oxidation experiment uses a TGA instrument of the type TherMax700 produced by Thermo Cahn Company. The heating rate is 50°C / min, and the temperature is kept at 900°C for 24 hours, and then cooled with the furnace. Figure 4 is the thermogravimetric analysis (TGA) kinetic curves of Ni-11Cr-3Al, Ni-11Cr and Ni-3Al nanocomposite coatings oxidized in air at 900°C for 24h. It can be seen from the figure that the oxidation weight gain of the Ni-11Cr-3Al nanocomposite coating is the lowest. The calculated oxidation parabolic constants of the three samples are 7.8×10 -12 , 1.4×10 -11 , 3.4×10 -9 g 2 / cm 4 ·s. Compa...

Embodiment 3

[0050] This example provides thermally grown Al 2 o 3 Properties and morphology of film-type Ni-Cr-Al nanocomposite coatings after oxidation in air at 900°C and 1000°C for 24h. Specifically, take Ni-5Cr-9Al nanocomposite coating as an example (the preparation method and high temperature oxidation test method are the same as above).

[0051] Fig. 8 is a graph comparing thermogravimetric analysis (TGA) curves of Ni-5Cr-9Al nanocomposite coatings oxidized in air at 900°C and 1000°C for 24 hours. Although the oxidation kinetics of the coating at 1000 °C is significantly higher than that at 900 °C, it can be seen from the comparison of the XRD analysis results of the above coating at 900 °C and 1000 °C in air in Figure 9 that Ni- The 5Cr-9Al nanocomposite coating has produced Al at the above two temperatures 2 o 3 . The above results can also be confirmed from the surface morphology (Figure 10-1, 10-2) and cross-sectional morphology (11-1, 11-2) of the corresponding oxide laye...

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Abstract

The invention discloses an M-Cr-Al nanometer composite coater and preparing method and application of heat-growing Cr2O3 or Al2O3 model, which is characterized by the following: containing nanometer size metal M and 5-20 percent nanometer metal Cr and 3-10 percent Al particle with dispersion allocating in the metal M, wherein M is Ni, Fe or Co; adopting Ni, Fe or Co, carbon steel or low-alloy steel as base material; adopting compound plating metal M and Cr and Al plater of conventional common battery depositing technology to produce Ni-Cr-Al, Fe-Cr-Al or Co-Cr-Al nanometer compound plater as anti-high temperature protective coater and anti-heat eroding protective coater.

Description

technical field [0001] The present invention relates to coating technology, specifically a kind of thermal growth Cr 2 o 3 or Al 2 o 3 Film-type M-Cr-Al (M=Ni, Fe, Co) nanocomposite electroplating layer, preparation method and application. Background technique [0002] It has been reported to prepare oxidation-resistant composite coatings with metal M (common Ni) and metal powder or alloy powder. Its basic principle is to co-electrodeposit metal powder or alloy powder and M by composite electroplating to form M / metal powder or M / alloy powder composite coating. Due to the high temperature environment, especially the ambient temperature above 1000 °C, the thermally grown Al 2 o 3 Has protective properties, and in a hot corrosion environment, the thermally grown Cr 2 o 3 It has protective properties, so Cr powder and Al powder, or CrAl alloy powder are often used as powder raw materials and co-electrodeposited with M to prepare composite coatings, in order to form Al i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/50C25D15/00C25D5/00
Inventor 彭晓杨秀英王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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