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aluminum alloy surface 3 c 4 -al 2 o 3 -zro 2 Preparation method of wear-resistant composite coating

A technology of aluminum alloy surface and composite coating, applied in the field of metal surface treatment, can solve the problems of low surface hardness, poor wear resistance and high friction coefficient of aluminum and aluminum alloys, and achieve good bonding strength, uniform cathode discharge and simple process. Effect

Active Publication Date: 2019-10-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low surface hardness, high friction coefficient and poor wear resistance of aluminum and aluminum alloys, the present invention provides an aluminum alloy surface Al with high bonding strength and excellent wear and corrosion resistance. 3 C 4 -Al 2 o 3 -ZrO 2 Preparation method of wear-resistant composite coating

Method used

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  • aluminum alloy surface <sub>3</sub> c <sub>4</sub> -al <sub>2</sub> o <sub>3</sub> -zro <sub>2</sub> Preparation method of wear-resistant composite coating
  • aluminum alloy surface <sub>3</sub> c <sub>4</sub> -al <sub>2</sub> o <sub>3</sub> -zro <sub>2</sub> Preparation method of wear-resistant composite coating
  • aluminum alloy surface <sub>3</sub> c <sub>4</sub> -al <sub>2</sub> o <sub>3</sub> -zro <sub>2</sub> Preparation method of wear-resistant composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) use figure 1 For the electrolytic cell structure shown in the figure, the aluminum alloy parts pre-treated by plasma electrolytic deposition are sanded smooth, and the polished aluminum alloy is immersed in an ethanol solution for ultrasonic treatment and dried to obtain a pretreated aluminum alloy;

[0025] (2) One side of the aluminum alloy surface is covered with an alumina ceramic sheet and placed on the cathode. A round hole is punched on the upper part of the aluminum alloy and the ceramic sheet, and fixed by double nuts on the left and right, so that the workpiece and the ceramic sheet are tightly combined. Control the distance between cathode and anode at 70mm, and control the area ratio at 7;

[0026] (3) adopt urea-glycerol system as electrolyte, the concentration of urea is 325g / L, the concentration of formamide is 190g / L, the concentration of glycerol is 125g / L, the concentration of zirconium nitrate is 17g / L, The concentration of ammonium nitrate is 4g...

Embodiment 2

[0030] (1) use figure 1 For the electrolytic cell structure shown in the figure, the aluminum alloy parts pre-treated by plasma electrolytic deposition are sanded smooth, and the polished aluminum alloy is immersed in an ethanol solution for ultrasonic treatment and dried to obtain a pretreated aluminum alloy;

[0031] (2) One side of the aluminum alloy surface is covered with an alumina ceramic sheet and placed on the cathode. A round hole is punched on the upper part of the aluminum alloy and the ceramic sheet, and fixed by double nuts on the left and right, so that the workpiece and the ceramic sheet are tightly combined. Control the distance between cathode and anode at 60mm, and control the area ratio at 6;

[0032] (3) adopt urea-glycerol system as electrolyte, the concentration of urea is 300g / L, the concentration of formamide is 180g / L, the concentration of glycerol is 100g / L, the concentration of zirconium nitrate is 15g / L, The concentration of ammonium nitrate is 3g...

Embodiment 3

[0036] (1) use figure 1 For the electrolytic cell structure shown in the figure, the aluminum alloy parts pre-treated by plasma electrolytic deposition are sanded smooth, and the polished aluminum alloy is immersed in an ethanol solution for ultrasonic treatment and dried to obtain a pretreated aluminum alloy;

[0037] (2) One side of the aluminum alloy surface is covered with an alumina ceramic sheet and placed on the cathode. A round hole is punched on the upper part of the aluminum alloy and the ceramic sheet, and fixed by double nuts on the left and right, so that the workpiece and the ceramic sheet are tightly combined. Control the distance between cathode and anode at 80mm, and control the area ratio at 8;

[0038] (3) adopt urea-glycerol system as electrolyte, the concentration of urea is 350g / L, the concentration of formamide is 200g / L, the concentration of glycerol is 150g / L, the concentration of zirconium nitrate is 20g / L, The concentration of ammonium nitrate is 5g...

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Abstract

The invention discloses a preparation method of an Al3C4-Al2O3-ZrO2 wear-resistant composite coating on the surface of aluminum alloy. According to the preparation method, an electrolytic tank of a single-groove structure is adopted, and a mixed solution prepared from zirconium nitrate, urea, formamide and glycerin is used as an electrolyte. The cathode side is covered with an aluminum oxide ceramic sheet with the size similar to the size of a workpiece so that a non-conducting shielding effect can be achieved in the discharging process, electric field distortion caused by the edge effect around the cathode is reduced, and discharging of the cathode is more uniform. A direct-current voltage or a pulse voltage is applied to the electrolytic tank, so that a continuous and uniform air film israpidly formed on the surface of the cathode, continuous plasma micro-arc discharging can be caused on the surface of the aluminum alloy, and accordingly, the stable, uniform and hard ceramic coatingis formed on the surface of the aluminum alloy. By adoption of the preparation method, the wear-resistant and corrosion-resistant coating with high hardness, a small friction coefficient and a low wear rate can be prepared on the surface of the aluminum alloy, and thus, the application of the aluminum alloy in the fields of traffic, energy and the like is effectively widened.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to an aluminum alloy surface Al 3 C 4 -Al 2 o 3 -ZrO 2 Preparation method of wear-resistant composite coating. Background technique [0002] Due to the characteristics of high strength, high toughness, light structure, good processability, and easy recycling, aluminum alloys are widely used in civil and military fields such as transportation, building materials, aviation, and aerospace, and have an irreplaceable role in national economy and national defense construction. important role. Due to the high activity of the aluminum alloy itself, a thin layer of dense oxide film is usually formed on the surface. Although it can protect the substrate to a certain extent, under the condition of sliding contact, repeated mechanical action makes the surface densely oxidized. The film peels off, and the exposed matrix with high activity reacts with the supporting material s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/12
Inventor 黄洁雯马凌志樊新民
Owner NANJING UNIV OF SCI & TECH
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