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

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...

Examples

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...

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...

Examples

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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