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Al2O3 or Cr2O3 film thermal growth type M-Cr-Al nano composite coating, and preparation and application thereof

A nano-composite and thermal growth technology, applied in the field of electrophoretic deposition technology and electrodeposition, can solve the problems affecting the industrial promotion of nano-composite coatings, low particle usage rate, insignificant effect, etc., and achieves good corrosion resistance, low cost and suitable for use. wide range of effects

Pending Publication Date: 2016-11-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

However, there are some problems in current research in this area, mainly: (1) the concentration of nanoparticles in the plating solution is very high during composite electroplating, and the utilization rate of particles is low. In addition, the price of nanoparticles is very high, which leads to the cost of this preparation method. (2) The performance of nanocomposite electroplating technology is mainly determined by the content of nanoparticles in the coating, and the increase of particle content in the coating has always been a major challenge for nanocomposite electroplating technology. Due to the limitation of the process, although there are many attempts to increase the content of nanoparticles in the coating, such as adding surfactants, changing the parameters of the electroplating process such as current, changing the composition of the plating solution, etc., the effect has not been obvious

Method used

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  • Al2O3 or Cr2O3 film thermal growth type M-Cr-Al nano composite coating, and preparation and application thereof
  • Al2O3 or Cr2O3 film thermal growth type M-Cr-Al nano composite coating, and preparation and application thereof
  • Al2O3 or Cr2O3 film thermal growth type M-Cr-Al nano composite coating, and preparation and application thereof

Examples

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preparation example Construction

[0041] The preparation method of the nanocomposite coating is carried out in two steps: (1) taking metal Ni, Fe, Co, carbon steel or low alloy steel as the base material, pre-electrophoretic deposition of nano metal Cr, Al particles and / or CrAl alloy on the base material (2) put the substrate of the electrophoretic deposition CrAl layer into the electroplating solution of Ni, Fe or Co for electrodeposition, so that the corresponding metal is deposited in the pores of the nanoparticles Internal nucleation and growth to prepare M-Cr-Al type nanocomposite coatings, namely Ni-Cr-Al, Fe-Cr-Al or Co-Cr-Al nanocomposite coatings.

[0042] Step (1) electrophoresis solution is: acetylacetone solution or acetone solution that has dissolved iodine simple substance, or dissolved AlCl 3 ·6H 2 O or MgCl 2 ·6H 2 O ethanol solution; the concentration of iodine element is 0.2 ~ 3.0g / L, AlCl 3 ·6H 2 O or MgCl 2 ·6H 2 The concentration of O is 0.2-3.0 g / L. During electrophoretic depositi...

Embodiment 1

[0046] This example provides the preparation and performance of the electrophoresis-electrodeposition two-step method for preparing nano-composite coatings when the electrophoresis solution is an acetylacetone solution. First, it introduces the preparation method for preparing a nano-coating by electrophoresis-electroplating when the electrophoresis solution is an acetylacetone solution. The specific steps are as follows :

[0047] 1) Take Ni as the base material, process it into a sample with a size of 15×10×2mm, grind it to 800# with water-grinding paper, clean it ultrasonically in acetone, and blow dry it for later use;

[0048] 2) 0.3g of Cr particles with an average particle diameter of 39nm ( Figure 1-2 ), 0.1g of CrAl alloy particles with an average particle size of 58nm ( Picture 1-1 ) soaked in the electrophoresis solution composed of 100ml acetylacetone and 0.03g iodine simple substance, so that the particles are dispersed and evenly suspended in the dispersant.

...

Embodiment 2

[0054] This embodiment provides a method for preparing a nanocomposite coating by electrophoresis-deposition two-step method when the electrophoresis solution is an ethanol solution, and the specific steps are as follows:

[0055] 1) Take Ni as the base material, process it into a sample with a size of 15×10×2mm, grind it to 800# with water-grinding paper, clean it ultrasonically in acetone, and blow dry it for later use;

[0056] 2) 0.4g average particle diameter is 39nm Cr particle, 0.1g average particle diameter is that 58nmCrAl alloy particle is soaked in by 100ml ethanol and 0.4g MgCl 2 ·6H 2 O in the electrophoretic solution, so that the particles are dispersed and evenly suspended in the dispersant.

[0057] 3) Electrophoretic deposition of a CrAl coating composed of Cr and CrAl particles on the surface of the Ni substrate. Before each electrophoresis, the nano-Cr and CrAl alloy particles are fully suspended in the electrophoresis solution by ultrasonic vibration. The...

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Abstract

The invention relates to the electrophoretic deposition technology and the electro-deposition technology, in particular to an Al2O3 or Cr2O3 film thermal growth type M-Cr-Al nano composite coating, and preparation and application thereof. The coating is composed of a nanocrystalline metal M coating body and metal Cr, Al and / or CrAl alloy nano particles distributed in the metal M coating body in a dispersed mode. The M-Cr-Al nano composite coating is prepared through the two steps of electrophoresis-electroplating deposition, wherein M is Ni or Fe or Co, the content of Cr is 5-22% by mass percentage, the content of Al is 3-15% by mass percentage, and the balance is M. The composite amount of the nano particles in the nano composite coating is greatly improved, and the antioxygenic property of the nano composite coating is also greatly improved. In the preparation process, the amount of the nano participles used is greatly lowered, the prepared nano composite coating is controllable in component and compact in structure, an Al2O3 or Cr2O3 oxidation film can grow in a thermal mode under a high-temperature or heat corrosion condition, and the Al2O3 or Cr2O3 film thermal growth type M-Cr-Al nano composite coating not only can serve as a high temperature oxidation resistance and hot corrosion resistance protective layer, but also can serve as a bonding layer between a thermal barrier coating and a substrate.

Description

technical field [0001] The invention relates to electrophoretic deposition technology and electrodeposition technology, specifically a two-step method of electrophoresis-electroplating deposition to prepare thermally grown Al 2 o 3 or Cr 2 o 3 Film-type M-Cr-Al (M=Ni, Fe, Co) nanocomposite coating, method and application. Background technique [0002] It has been reported to use metal M (common Fe, Co, Ni) and nanometer metal powder or alloy powder to prepare anti-oxidation nanocomposite coating. The basic principle of composite electroplating is to use metal M (common Ni) and metal powder or alloy powder and metal M to co-deposit, and wrap the metal powder or alloy powder into the coating while reducing the metal, so as to obtain M / metal powder type or M / Alloy powder type composite coating. When the ambient temperature is 800-1100 ° C high-temperature oxidation, or in a hot-corrosion environment, the thermally grown Al 2 o 3 or Cr 2 o 3 All have protective propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02C25D15/02C25D5/50C25D3/20C25D3/12
CPCC25D3/12C25D3/20C25D5/50C25D13/02C25D15/02
Inventor 彭晓甄会娟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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