Hole sealing method for magnesium alloy surface rare earth chemical conversion coating

A chemical conversion coating and magnesium alloy technology, which is applied in the direction of metal material coating process, etc., can solve the problems of discontinuous conversion coating and low substrate coverage, and achieve the effects of low cost, simple preparation process and improved corrosion resistance.

Inactive Publication Date: 2016-06-01
GANNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sealing method for the rare earth chemical conversion coating on the surface of a magnesium alloy, which solves the problems of the above-mentioned split structure of the rare earth conversion coating, discontinuity of the conversion coating, and low coverage of the substrate

Method used

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  • Hole sealing method for magnesium alloy surface rare earth chemical conversion coating
  • Hole sealing method for magnesium alloy surface rare earth chemical conversion coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Pretreatment: After grinding and polishing the magnesium alloy workpiece, place it in an acetone solution for ultrasonic treatment for 10 minutes, with a power of 200-1000W; then soak the obtained magnesium alloy workpiece in deionized water for 10 minutes, and dry it with hot air for later use; The ion-washed magnesium alloy workpiece is soaked in hydrofluoric acid for 1 minute, the purpose is to enhance the bonding force between the rare earth conversion coating and the substrate; finally, the acidified magnesium alloy workpiece is soaked in deionized water for 10 minutes, and dried with hot air for later use.

[0026] Immerse the magnesium alloy pretreated workpiece obtained by pretreatment in a rare earth chemical conversion coating solution composed of 10g / L cerium nitrate, 5g / L sodium fluoride, and 1g / L citric acid for 10 minutes to obtain a magnesium alloy rare earth chemical conversion film. membrane;

[0027] Finally, immerse the obtained magnesium alloy workpi...

Embodiment 2

[0029] Pretreatment: After grinding and polishing the magnesium alloy workpiece, place it in an acetone solution for ultrasonic treatment for 30 minutes, with a power of 200-1000W; then soak the obtained magnesium alloy workpiece in deionized water for 30 minutes, and dry it with hot air for later use; The ion-washed magnesium alloy workpiece is soaked in hydrofluoric acid for 5 minutes, the purpose is to enhance the bonding force between the rare earth conversion coating and the substrate; finally, the acidified magnesium alloy workpiece is soaked in deionized water for 30 minutes, and dried with hot air for later use.

[0030] Immerse the magnesium alloy pretreated workpiece obtained by pretreatment in a rare earth chemical conversion coating solution composed of 30g / L cerium nitrate, 30g / L sodium fluoride, and 5g / L citric acid for 60 minutes to obtain a magnesium alloy rare earth chemical conversion film. membrane;

[0031] Finally, immerse the obtained magnesium alloy work...

Embodiment 3

[0033] Pretreatment: After grinding and polishing the magnesium alloy workpiece, place it in acetone solution for ultrasonic treatment for 20 minutes, with a power of 200-1000W; then soak the obtained magnesium alloy workpiece in deionized water for 20 minutes, and dry it with hot air for later use; The ion-washed magnesium alloy workpiece is soaked in hydrofluoric acid for 3 minutes, the purpose is to enhance the bonding force between the rare earth conversion coating and the substrate; finally, the acidified magnesium alloy workpiece is soaked in deionized water for 20 minutes, and dried with hot air for later use.

[0034] Immerse the pretreated magnesium alloy pretreated workpiece obtained by pretreatment into a rare earth chemical conversion coating solution composed of 20g / L cerium nitrate, 18g / L sodium fluoride, and 3g / L citric acid for 20 minutes to obtain figure 1 The magnesium alloy rare earth chemical conversion coating shown;

[0035] Finally, the obtained magnesiu...

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Abstract

The invention discloses a hole sealing method for a magnesium alloy surface rare earth chemical conversion coating. The hole sealing method includes the following steps that firstly, a magnesium alloy is pretreated; secondly, a pretreated magnesium alloy workpiece is soaked in a rare earth chemical conversion coating solution to be soaked for 10 min to 60 min, and the magnesium alloy rare earth chemical conversion coating is obtained; and thirdly; the magnesium alloy workpiece obtained in the second step is soaked in an oxidized graphene supernatant solution with a certain condensation for 20 min to 30 min and is dried at the temperature of 30 DEG C to 60 DEG C for 1 h to 3 h, and the magnesium alloy surface rare earth chemical conversion coating with holes sealed by oxidized graphene is obtained. According to the hole sealing method, the magnesium alloy rare earth conversion coating layer is soaked in the oxidized graphene supernatant solution, the oxidized graphene is soaked in conversion coating microcracks, the compactness of the rare earth conversion coating layer is enhanced, the problems that the crack-like structure of the rare earth conversion coating is generated, the conversion coating is discontinuous and the degree of covering a base body is low are solved, and the corrosion resistance of the magnesium alloy rare earth chemical conversion coating is improved remarkably.

Description

technical field [0001] The invention specifically relates to a hole sealing method for a rare earth chemical conversion coating on the surface of a magnesium alloy, and belongs to the technical field of magnesium alloy surface treatment. Background technique [0002] At present, resources and the environment have become the primary issues of human sustainable development, and magnesium alloy, as the lightest metal structure material, has unique advantages in energy saving and emission reduction; It has excellent properties such as anti-seismic and electromagnetic shielding, and has extremely broad application prospects in the fields of transportation, electronic communication, aerospace, national defense and military industry. However, the chemical properties of magnesium are lively, the electrode potential is very low (-2.37V), and the PB ratio of the formed oxide film is less than 1, which makes magnesium alloys extremely vulnerable to corrosion damage in the application e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/82C23C22/34
CPCC23C22/34C23C22/82
Inventor 韩宝军杨洋古东懂黄志娟方玲杨初斌彭光怀张小联王科军
Owner GANNAN NORMAL UNIV
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