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Thermal growing Cr2O3 film type Cu-Ni-Cr nano composite coating and preparation and use

A nano-composite and thermal growth technology, applied in coatings, electrolytic coatings, etc., can solve the problem that Cu-Ni alloys do not have high temperature oxidation resistance, improve high temperature oxidation resistance, prevent peeling oxidation, nucleation and growth inhibiting effect

Inactive Publication Date: 2009-01-28
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

Therefore, there is currently no way to solve the problem that Cu-Ni alloys do not have high temperature oxidation resistance.

Method used

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  • Thermal growing Cr2O3 film type Cu-Ni-Cr nano composite coating and preparation and use
  • Thermal growing Cr2O3 film type Cu-Ni-Cr nano composite coating and preparation and use
  • Thermal growing Cr2O3 film type Cu-Ni-Cr nano composite coating and preparation and use

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Experimental program
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Effect test

Embodiment 1

[0036] This embodiment introduces the preparation and performance of Cu-Ni-Cr nanocomposite coating, and its preparation method is to adopt conventional co-electrodeposition (i.e. composite electroplating) technology to prepare Cu-Ni-Cr nanocomposite coating; Plating solution is a citrate system, Cr powder is nano-sized. This embodiment will be described in detail with the preparation and result example of Cu-Ni-Cr nanocomposite coating, figure 1 For the transmission electron microscope (TEM) appearance of the nano-Cr powder used in this embodiment, as can be seen from the figure, the average size of the nano-Cr powder is about 40nm (the nano-Cr powder used in this embodiment has a minimum of 10nm and a maximum of 70nm).

[0037] The process of preparing Cu-Ni-Cr nanocomposite coating in this embodiment is as follows:

[0038] Substrate (pure Cu used in the embodiment of the present invention)—surface polished to 1000# water grinding sandpaper—surface ultrasonic cleaning—carr...

Embodiment 2

[0046] This example provides Cu-Ni-Cr nanocomposite coatings and Cu55Ni alloy coatings with a Cu / Ni ratio of less than or equal to 1.0 and greater than or equal to 0.9, the performance and morphology after oxidation in air at 800 ° C for 20 h (the preparation method is the same as above). Specifically, Cu44Ni15Cr and Cu41Ni20Cr nanocomposite coatings (Cu / Ni ratios are 0.93 and 0.95, respectively) are taken as examples.

[0047] The high-temperature oxidation experiment adopts the TGA instrument of model TherMax700 produced by Thermo Cahn Company, the heating rate is 50°C / min, the temperature is kept at 800°C for 20 hours, and then cooled with the furnace. Figure 6 It is the thermogravimetric analysis (TGA) kinetic curve of Cu55Ni alloy coating and Cu44Ni15Cr, Cu41Ni20Cr nanocomposite coating after oxidation in air at 800℃ for 20h. It can be seen from the figure that the high temperature oxidation resistance of the nanocomposite coating has been greatly improved. Figure 7-a ...

Embodiment 3

[0053] This example provides a Cu-Ni-Cr nanocomposite coating with Cu / Ni>1.0 (Cu-rich) and a thermal gravimetric analysis (TGA) curve after oxidation in air at 800° C. for 20 h. Specifically, Cu40Ni alloy coating and Cu30Ni20Cr nanocomposite coating (Cu / Ni ratios are 1.50 and 1.67 respectively) are taken as examples.

[0054] Figure 11 It is the thermogravimetric analysis (TGA) curve of Cu40Ni alloy coating and Cu30Ni20Cr nanocomposite coating after oxidation in air at 800℃ for 20h. It can be calculated from their parabolic kinetic curves that the parabolic constant of the Cu40Ni alloy coating is 2.2×10 -9 g 2 cm -4 the s -1 , the average parabolic constant of the Cu30Ni20Cr nanocomposite coating is 4.3×10 -11 g 2 cm -4the s -1 , it can be seen that the high-temperature oxidation resistance of the composite coating with a nano-Cr content of 20% has been improved by about 2 orders of magnitude, and a continuous and dense Cr 2 o 3 membrane.

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Abstract

The present invention discloses a kind of thermal grown Cr2O3 type nanometer composite Cu-Ni-Cr coating and its preparation and application. The nanometer composite Cu-Ni-Cr coating is prepared with Cu-Ni alloy and nanometer Cr powder and have Cu-Ni alloy base with different Cu / Ni ratio, and Cr content of 15-30 wt%. The preparation process of the nanometer composite Cu-Ni-Cr coating is to electroplate Cu-Ni alloy and Cr onto Cu substrate through conventional electric co-deposition. The present invention has simple technological process, controllable coating components and low cost, and the prepared nanometer composite coating is compact and with homogeneously distributed nanometer Cr grains. The coating of the present invention may be used as high temperature oxidation resisting coating on Cu or Cu base alloy.

Description

technical field [0001] The present invention relates to coating technology, specifically a kind of thermal growth Cr 2 o 3 Film-type Cu-Ni-Cr nanocomposite coating, its preparation method and application. Background technique [0002] When some Cu, Cu-based and Cu-Ni-based alloy materials are used at high temperatures, they all generate P-type semiconductor oxides CuO, Cu 2 O and NiO mainly rely on the outward diffusion of metals to form oxides, while Cu and Ni have very fast diffusion rates at high temperatures (especially the diffusion rate of Cu). 2 The self-diffusion coefficient in O is 10 -8 cm 2 the s -1 , the self-diffusion coefficient of Ni in NiO in air at 900°C is 10 -13 cm 2 the s -1 , and these oxide films are not protective, resulting in rapid material degradation and reduced service life. Thermally grown continuous Cr 2 o 3 The film has protective properties, but due to the different diffusion coefficients of Cr in Cu and Ni alloys: the diffusion of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D3/56
Inventor 彭晓黄忠平王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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