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Aluminum alloy Ce-Cu composite conversion coating and preparation method thereof

A technology of aluminum alloy and conversion coating, applied in the direction of metal material coating process, etc., can solve the problems of undiscovered preparation method of aluminum alloy Ce-Cu composite conversion coating, low film-forming efficiency of conversion treatment liquid, and difficulty in meeting industrialized production, etc. Achieve the effect of strong repeatability, dense bonding and low production cost

Inactive Publication Date: 2014-07-02
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Document 4 (Zhang Junjun, Li Wenfang, Du Jun. Preparation and properties of Ce-Mn conversion film on the surface of aluminum alloy at room temperature. 3 ) 3 and KMnO 4 The Ce-Mn conversion film is prepared by the rare earth conversion film process of the main salt, but the film-forming efficiency of the conversion treatment liquid of this process is low, it takes a long time, and the conversion temperature is high, which is difficult to meet the needs of industrial production; this process also uses NaF As a film-forming accelerator, accelerate the film-forming rate of Ce-Mn conversion film, improve film-forming efficiency, and realize rapid film-forming at room temperature
[0008] Although there have been preliminary studies on rare earth conversion coatings on the surface of aluminum alloys, so far, no reports have been found on the Ce-Cu composite conversion coatings on aluminum alloys and their preparation methods.

Method used

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  • Aluminum alloy Ce-Cu composite conversion coating and preparation method thereof
  • Aluminum alloy Ce-Cu composite conversion coating and preparation method thereof
  • Aluminum alloy Ce-Cu composite conversion coating and preparation method thereof

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Embodiment 1

[0043] The aluminum alloy Ce-Cu composite conversion film of this embodiment is composed of four elements: Ce, Cu, Al and O. The mass percentage of Ce in the aluminum alloy Ce-Cu composite conversion film is 28.45%, and the mass percentage of Cu is 13.65%, the mass percentage of Al is 31.54%, and the mass percentage of O is 26.36%.

[0044] The preparation method of the aluminum alloy Ce-Cu composite conversion coating of the present embodiment comprises the following steps:

[0045] Step 1. Perform surface pretreatment on the 2019 aluminum alloy with a size of 20mm×10mm×3mm:

[0046] Step 101, using 600#, 800#, 1000#, 1200# and 2000# metallographic sandpaper in sequence to pre-grind the surface of the aluminum alloy;

[0047] Step 102, degreasing the aluminum alloy pre-ground in step 101 in an alkaline degreasing solution at a temperature of 90° C. for 10 minutes; the alkaline degreasing solution is preferably prepared by mixing sodium silicate, sodium carbonate and deionize...

Embodiment 2

[0052] The aluminum alloy Ce-Cu composite conversion film of this embodiment is composed of four elements: Ce, Cu, Al and O. The mass percentage of Ce in the aluminum alloy Ce-Cu composite conversion film is 20%, and the mass percentage of Cu is 18%, the mass percentage of Al is 35%, and the mass percentage of O is 27%.

[0053] The preparation method of the aluminum alloy Ce-Cu composite conversion coating of the present embodiment comprises the following steps:

[0054] Step 1. Surface pretreatment of LY12 aluminum alloy with a size of 20mm×10mm×4mm:

[0055] Step 101, using 600#, 800#, 1000#, 1200# and 2000# metallographic sandpaper in sequence to pre-grind the surface of the aluminum alloy;

[0056] Step 102, degreasing the aluminum alloy pre-ground in step 101 in an alkaline degreasing solution at a temperature of 95° C. for 5 minutes; the alkaline degreasing solution is made by mixing sodium silicate, sodium carbonate and deionized water. The concentration of sodium si...

Embodiment 3

[0061] The aluminum alloy Ce-Cu composite conversion film of this embodiment is composed of four elements: Ce, Cu, Al and O. The mass percentage of Ce in the aluminum alloy Ce-Cu composite conversion film is 35%, and the mass percentage of Cu is 10%, the mass percentage of Al is 35%, and the mass percentage of O is 20%.

[0062] The preparation method of the aluminum alloy Ce-Cu composite conversion coating of the present embodiment comprises the following steps:

[0063] Step 1. Surface pretreatment of 6063 aluminum alloy with a size of 20mm×10mm×2mm:

[0064] Step 101, using 600#, 800#, 1000#, 1200# and 2000# metallographic sandpaper in sequence to pre-grind the surface of the aluminum alloy;

[0065] Step 102, degreasing the aluminum alloy pre-ground in step 101 in an alkaline degreasing solution at a temperature of 80° C. for 20 minutes; the alkaline degreasing solution is made by mixing sodium silicate, sodium carbonate and deionized water. The concentration of sodium s...

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Abstract

The invention provides an aluminum alloy Ce-Cu composite conversion coating, which comprises four elements including Ce, Cu, Al and O, wherein the mass percentage of Ce in the aluminum alloy Ce-Cu composite conversion coating is 5-48%, the mass percentage of Cu is 8-20%, the mass percentage of Al is 20-40%, and the mass percentage of O is 15-35%. The invention further provides a preparation method of the Ce-Cu composite conversion coating, and the preparation method comprises the following steps: 1, pre-treating an aluminum alloy surface; 2, converting the pre-treated aluminum alloy in conversion treatment liquid to obtain the aluminum alloy Ce-Cu composite conversion coating. The aluminum alloy Ce-Cu composite conversion coating, provided by the invention, has the advantages of simple preparation process, low production cost, easily controlled technique parameters, short conversion time and strong repeatability; the aluminum alloy Ce-Cu composite conversion coating prepared by the preparation method is compact and firmly combined with an aluminum alloy substrate, and has excellent anti-corrosion protection performance.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface engineering, and in particular relates to an aluminum alloy Ce-Cu composite conversion film and a preparation method thereof. Background technique [0002] Chemical oxidation treatment technology is the most commonly used method for corrosion protection of aluminum alloys. [0003] Document 1 (Yu Xingwen, Li Ning, Zhou Yuhong, etc. Rare earth conversion coatings on metal surfaces. Materials Herald, 1998, 12(4): 24-24) mentioned Hinton and Arnott from the Materials Science Department of the Australian Aeronautical Research Laboratory in the early 1980s. Put Ce 3+ As a corrosion inhibitor of 7075 aluminum alloy in NaCl solution, the corrosion rate of 7075 aluminum alloy is reduced to 1 / 10 of the original. Later, Hinton et al. pre-dipped the aluminum alloy in CeCl 3 In the solution, a layer of straw yellow film is formed, and the corrosion resistance of this film is much higher than...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/56
Inventor 王志华王昕杨建业朱明
Owner XIAN UNIV OF SCI & TECH
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