Method for preparing nano SiO2 containing coating on surface of cast aluminium alloy through micro-arc oxidation

A casting aluminum alloy, micro-arc oxidation technology, applied in the direction of coating, anodic oxidation, electrolytic coating, etc., can solve the problems of easy looseness of aluminum alloy micro-arc oxidation coating, poor film surface finish, uneven color, etc., to achieve the applicable Wide range, good coating density and simple operation

Inactive Publication Date: 2015-12-16
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method that can change the composition and structure of the cast aluminum alloy micro-arc oxidation coating, reduce the micro-cracks of the micro-arc oxidation film, improve the density, wear resistance and corrosion resistance of the coating, And the treatment process is less, the treatment process and post-treatment are environmentally friendly, and the micro-arc oxidation on the surface of the cast aluminum alloy is used to prepare nano-SiO 2 The coating method solves the problem of porosity, pitting, poor film surface finish, uneven color and luster of cast aluminum alloy micro-arc oxidation coating, and SiO 2 The problem that nanoparticles cannot be deposited on the surface of cast aluminum alloy due to insolubility in electrolyte

Method used

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  • Method for preparing nano SiO2 containing coating on surface of cast aluminium alloy through micro-arc oxidation
  • Method for preparing nano SiO2 containing coating on surface of cast aluminium alloy through micro-arc oxidation

Examples

Experimental program
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Embodiment 1

[0024] Preparation of nano-SiO by micro-arc oxidation on the surface of cast aluminum alloy 2 A coating method comprising the steps of:

[0025] 1. Pretreatment: Sand the cast aluminum alloy sample step by step with sandpaper until the surface is smooth without obvious scratches, then ultrasonically clean it in acetone for 10 minutes, and air dry at room temperature;

[0026] 2. SiO 2 Nanoparticle treatment: SiO with particle size less than 100nm 2 Nanoparticles were soaked in a solution of non-ionic surfactant OP-21 with a concentration of 1g / L for 8 minutes, and dispersed ultrasonically, with an ultrasonic frequency of 40kHz and a treatment time of 10min;

[0027] 3. Prepare the coating: take the cast aluminum alloy sample as the anode and the stainless steel plate as the cathode, immerse the anode in the electrolyte, then apply a pulse voltage between the cathode and the anode, and perform micro-arc oxidation in constant voltage mode. The stirring speed is 60r / min, the p...

Embodiment 2

[0033] 1. Pretreatment: Sand the cast aluminum alloy sample step by step with sandpaper until the surface is smooth without obvious scratches, then ultrasonically clean it in alcohol for 25 minutes, and air dry at room temperature;

[0034] 2. SiO 2 Nanoparticle treatment: SiO with particle size less than 100nm 2 Nanoparticles were soaked in a solution of non-ionic surfactant OP-21 with a concentration of 5g / L for 15 minutes, and dispersed ultrasonically, with an ultrasonic frequency of 60kHz and a treatment time of 25 minutes;

[0035] 3. Prepare the coating: take the cast aluminum alloy sample as the anode and the stainless steel plate as the cathode, immerse the anode in the electrolyte, then apply a pulse voltage between the cathode and the anode, and perform micro-arc oxidation in constant voltage mode. The stirring speed is 90r / min, the processing temperature does not exceed 60°C, and the processing time is 60min.

[0036] The electrical characteristic parameters are: ...

Embodiment 3

[0041] 1. Pretreatment: Sand the cast aluminum alloy sample step by step with sandpaper until the surface is smooth without obvious scratches, then ultrasonically clean it in acetone for 30 minutes, and air dry at room temperature;

[0042] 2. SiO 2 Nanoparticle treatment: SiO with particle size less than 100nm 2 Nanoparticles were soaked in a solution of non-ionic surfactant OP-21 with a concentration of 10g / L for 20 minutes, and dispersed by ultrasonic, with an ultrasonic frequency of 50kHz and a treatment time of 15 minutes;

[0043] 3. Prepare the coating: take the cast aluminum alloy sample as the anode and the stainless steel plate as the cathode, immerse the anode in the electrolyte, then apply a pulse voltage between the cathode and the anode, and perform micro-arc oxidation under constant current mode. The stirring speed is 220r / min, the treatment temperature does not exceed 40°C, and the treatment time is 40min.

[0044] The electrical characteristic parameters are...

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Abstract

The invention discloses a method for preparing nano SiO2 containing coating on the surface of cast aluminium alloy through micro-arc oxidation. The method comprises the following steps: after pretreatment, a test sample is subjected to the micro-arc oxidation treatment in SiO2 nano-particle containing electrolyte, 1-10 g/L nano SiO2 particles are added, the pH is 10-13, and then water scrubbing is adopted to remove residual electrolyte on the surface of the test sample, wherein the electrolyte is composed of one or more of the followings: 5-16 g/L sodium silicate, 6-14 g/L sodium metaaluminate, 1-5 g/L sodium hydroxide, 1-5 g/L EDTA, 1-5 g/L sodium tungstate, 1-4 g/L sodium fluoride, 1-5 g/L sodium carbonate, and 1-2 g/L sodium pyrophosphate. With adoption of the method, the composition and structure of the cast aluminium alloy micro-arc oxidation coating can be changed, microcracks of a micro-arc oxidation film can be reduced, and the density, abrasive resistance and corrosion resistance of the coating can be improved; in addition, the treatment working procedures are few, the treatment process and aftertreatment are environment-friendly, and the problems that the cast aluminium alloy micro-arc oxidation coating is likely to become loose and have hard spots and is poor in film surface smoothness and is nonuniform in color and luster are solved.

Description

technical field [0001] The invention relates to the technical field of surface modification of aluminum and aluminum alloys, in particular to a method for preparing nano-SiO by micro-arc oxidation on the surface of cast aluminum alloys. 2 method of coating. Background technique [0002] Micro-arc oxidation technology is an important surface modification technology developed on the basis of anodic oxidation, and has been widely used in aerospace, mechanical electronics, petrochemical and other fields. Anodizing technology can improve the surface properties of cast aluminum alloys, but the obtained film is thinner, lower in hardness, poor in strength and toughness, and the film is prone to uneven color, black spots, rough surface, flow marks, and uneven film thickness and defects such as peeling. Moreover, before anodizing, a series of pretreatments such as degreasing and corrosion are required. After anodizing, sealing treatment is required. The process is quite complicated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D15/00
Inventor 李伟洲唐仕光陈泉志杨阳黄祖江马晓欣
Owner GUANGXI UNIV
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