Thermal growth AL2O3 film type M A1 nano composite plating and producing process and application

A nano-composite and thermal growth technology, applied in coatings, electrolytic coatings, etc., can solve the problems of not very large improvement in oxidation performance, uneven distribution of Al particles, and insufficient composite amount, so as to improve the anti-oxidation performance, improve the The number of nucleation and the effect of coating densification

Inactive Publication Date: 2005-02-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research progress in this area is not large, and the key factor is that the added powder is micron-sized. This composite coating prepared by traditional metal-micron-sized metal particle co-electrodeposition has the following shortcomings: (1) The distribution of Al particles is not uniform, and the compounding amount cannot reach the formation of protective Al 2 o 3 The critical value required for the oxide film, (2) high porosity
Therefore, the composite coating prepared in this way must undergo high-temperature vacuum diffusion homogenization treatment and pressure densification treatment before use, and the oxidation performance after treatment is not greatly improved.

Method used

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  • Thermal growth AL2O3 film type M A1 nano composite plating and producing process and application
  • Thermal growth AL2O3 film type M A1 nano composite plating and producing process and application
  • Thermal growth AL2O3 film type M A1 nano composite plating and producing process and application

Examples

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Embodiment 1

[0047] The composition of the M-Al nanocomposite coating of the present invention is a combination of nanocrystalline M-based coating and second-phase Al nanoparticles dispersedly distributed, that is, M-Al, wherein M can be Ni, Fe or Co; Deposition (i.e. composite electroplating) technology is used to prepare Ni-Al, Fe-Al or Co-Al nanocomposite coatings; the plating solution is the commonly used above-mentioned sulfate system (MSO 4 ), the Al powder is nano-sized. In this embodiment, the preparation and results of the Ni-Al nanocomposite coating will be described in detail. The average particle size of the nano-Cr powder used is 40 and 75 nm, respectively.

[0048] Its flow process that present embodiment prepares Ni-Al nanocomposite coating is:

[0049] The base metal is Ni (Fe, Co, carbon steel or low alloy steel can also be used as the base material) - surface grinding to 800# water sandpaper - surface ultrasonic cleaning - co-electrodeposition in Ni plating bath containi...

Embodiment 2

[0057] Example 2 (oxidation performance at 950°C)

[0058] Whether the nanocomposite coating of the present invention has superior high temperature oxidation resistance depends on whether the nanocomposite coating can thermally grow continuous protective Al 2 o 3 Oxide film.

[0059] The temperature used in this embodiment is in the range of 950-1050°C. When the Al composite amount in the nanocomposite coating exceeds a critical value, the nanocomposite coating can thermally grow protective Al 2 o 3 membrane. Thermally grown Al 2 o 3 The minimum content (or critical content) required by the film is related to the nanometer size of the added Al powder. The smaller the particle size, the lower the critical content. For example, when the average size used in the embodiment is respectively 40 and 75nm, the minimum content of Al is respectively 9.8 and 12.9% by mass percentage at 950°C, the maximum content is 35%, and the balance is M; with the increase of oxidation temperat...

Embodiment 3

[0062] Example 3 (oxidation resistance at 1050°C)

[0063] As mentioned before, as long as the compounded Al content exceeds the critical content, the nanocomposite coating can grow continuous protective Al 2 o 3 oxide layer, and the higher the Al content, the formation of continuous Al 2 o 3 The shorter the time required for the oxide layer, that is, the better the protection performance. This example mainly introduces the oxidation of Ni-28Al nanocomposite coating with an average particle size of 75nm at 1050°C.

[0064] The oxidation experiment was carried out in a laboratory environment at a temperature of 1050°C for 20 hours. Figure 7 It is the oxidation weight gain of the substrate Ni, the single Ni coating, and the Ni-28Al nanocomposite coating at 20 h. The oxidation parabolic constants calculated for the three samples are 2.5×10 -11 , 6.4×10 -10 , 5.5×10 -12 g 2 / cm 4 ·s. Oxidation rate of Ni-28Al and Al 2 o 3 The thermal growth rate is comparable. Accor...

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Abstract

The thermally grown Al2O3 film type M-Al nano composite coating consists of nano crystal M coating and nano metal Al grains dispersed in the coating, where M is Ni, Fe or Co. The Al content is 9.8-35 wt%, and M is the rest. The nano composite Ni-Al, Fe-Al or Co-Al coating is prepared through composite electroplating process to deposit metal M and Al coating on to the base material of Ni, Fe or Co, carbon steel or alloy steel. The present invention has the features of simple technological process, low cost, high and controllable compounded amount, compact coating, no need of vacuum diffusion treatment of the nano composite coating, direct thermally growth of protecting Al2O3 film, etc.

Description

technical field [0001] The present invention relates to coating technology, specifically a kind of thermal growth Al 2 o 3 Film-type M-Al (M=Ni, Fe, Co) nanocomposite coating, its 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 and M by composite electroplating to form M-metal powder composite coating. Due to the high temperature environment, the thermally grown Al 2 o 3 It has protective properties, so Al powder, or alloy powder containing Al has been proposed as a powder raw material and co-electrodeposited with M to prepare a composite coating, in order to form Al during high temperature oxidation 2 o 3 protective oxide film. However, the current research progress in this area is not large, and the key factor is that the added powder is micron-sized. This composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
Inventor 彭晓周月波王福会姜涛铁军
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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