Corrosion-resistant aluminum-carbon composite material and preparation method thereof

An aluminum-carbon composite material and corrosion resistance technology, applied in the field of composite material preparation, can solve the problems of weakening macroscopic corrosion resistance, aggravating the heterogeneity of composite materials, crevice corrosion, etc. , Improve the effect of corrosion resistance

Active Publication Date: 2022-08-09
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

The large potential difference between the two brings serious microgalvanic corrosion effect, and the aluminum substrate acts as an anode for rapid corrosion and dissolution to form the so-called graphene-accelerated corrosion phenomenon; (2) such as O 2 、H 2 Small molecules such as O can diffuse along the defective edges of graphene, causing it to diffuse into the matrix and form severe crevice corrosion; (3) The high specific surface area of ​​graphene determines its serious van der Waals adsorption phenomenon , which makes it easy to form agglomerates in the aluminum matrix composite, which further aggravates the heterogeneity of the composite and weakens its macroscopic corrosion resistance

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  • Corrosion-resistant aluminum-carbon composite material and preparation method thereof
  • Corrosion-resistant aluminum-carbon composite material and preparation method thereof

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preparation example Construction

[0026] like figure 1 As shown, a method for preparing a corrosion-resistant aluminum-carbon composite material according to an embodiment of the present invention includes the following steps:

[0027] Step S1: under the protective atmosphere of argon, the graphene, the aluminum powder and the process control agent are mixed and ball-milled, and after heating and heat preservation, the aluminum-carbon composite powder is obtained;

[0028] Step S2: After the aluminum-carbon composite powder is rotationally extruded and held by large plastic deformation, a corrosion-resistant aluminum-carbon composite material is obtained.

[0029] In the embodiment of the present invention, graphene, aluminum powder and process control agent are mixed and ball-milled, and then the aluminum-carbon composite powder is rotationally extruded and held by large plastic deformation, so that graphene is broken and peeled off in the aluminum matrix. , redistribute, realize super-homogeneous distributi...

Embodiment 1

[0049] In the present embodiment, the corrosion-resistant aluminum-carbon composite material is prepared by the preparation method of the corrosion-resistant aluminum-carbon composite material, and the specific steps are as follows:

[0050] Step S1: weigh 0.3 g of thin-layer graphene nanosheets and 19.7 g of 1060 industrial pure aluminum powder in a high-purity argon-protected glove box (water and oxygen < 0.01 ppm), put them into a vacuum-sealed stainless steel ball mill, and then place them in a vacuum-sealed stainless steel ball mill. The stainless steel ball milling jar is sealed in the glove box and taken out for ball milling, and then placed under the protection of high-purity argon and heated to 450 ° C and kept for 0.5 h, until the process control agent is completely volatilized, and the pre-mixed aluminum-carbon composite powder is obtained; among them, graphite The number of layers of the alkene nanosheets is 5-15 layers, the average particle size of the pure aluminu...

Embodiment 2

[0055] In the present embodiment, the corrosion-resistant aluminum-carbon composite material is prepared by the preparation method of the corrosion-resistant aluminum-carbon composite material, and the specific steps are as follows:

[0056] Step S1: Weigh 0.3 g of graphene fluoride, 18.6 g of 1060 pure aluminum powder and 1.1 g of 99.9% pure magnesium powder in a high-purity argon-protected glove box (water and oxygen < 0.01 ppm) to form an Al-Mg alloying system , put it into a vacuum-sealed stainless steel ball mill, and add about 0.8g polyethylene glycol (Mn 2000) as a process control agent, seal the ball mill in a glove box and take it out for ball milling, and then place it under high-purity argon protection It is heated to 400 °C and kept for 1 h until the process control agent is completely volatilized, and a pre-mixed aluminum-carbon composite powder is obtained; wherein the number of layers of fluorinated graphene is 5-15 layers, and the average particle size of the pu...

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Abstract

The invention discloses a corrosion-resistant aluminum-carbon composite material and a preparation method thereof, and relates to the technical field of composite material preparation, the preparation method comprises the following steps: step S1: in an argon protection atmosphere, mixing graphene, aluminum powder and a process control agent, and carrying out ball milling, heating and heat preservation to obtain aluminum-carbon composite powder; and S2, carrying out rotary extrusion on the aluminum-carbon composite powder through severe plastic deformation, and carrying out load holding, so as to obtain the corrosion-resistant aluminum-carbon composite material. According to the preparation method, super-homogeneous distribution of graphene and ultra-fine grain of the structure are achieved through ball milling and severe plastic deformation, the bottleneck of the antagonism relation between obdurability and corrosion resistance of the aluminum-carbon composite material is broken through, the material in the preparation method is free of the melting-solidification process, energy needed by sintering is remarkably reduced, the process difficulty is reduced, and the preparation method is suitable for industrial production. The method is a green manufacturing technology with energy-saving and environment-friendly technical characteristics.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a corrosion-resistant aluminum-carbon composite material and a preparation method thereof. Background technique [0002] As a two-dimensional material, graphene possesses extremely high in-plane elastic modulus and tensile strength, and is considered to be a new-generation reinforcement phase for aluminum matrix composites. Its huge specific surface area brings a significant load transfer effect, which greatly improves the comprehensive strength and toughness of aluminum matrix composites. However, existing graphene-aluminum-based composites, especially high-strength graphene-reinforced aluminum-matrix composites, often exhibit extremely poor corrosion resistance. This can be attributed to the following three reasons: (1) Graphene, as a carbon-based substance, has a corrosion potential of 0.2V vs. SCE (saturated calomel electrode), while the corrosion pote...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05B22F3/20B22F9/04B22F1/12C22C21/00C22C21/06
CPCC22C1/05C22C1/0416B22F3/20B22F9/04B22F1/12C22C21/00C22C21/06B22F2009/043B22F2009/042Y02E60/10
Inventor 谢聿铭黄永宪孟祥晨冒冬鑫
Owner HARBIN INST OF TECH
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