Stannate/zirconate composite conversion solution for magnesium alloy surface treatment and preparation method and using method thereof

A technology of surface treatment and conversion solution, which is applied in the direction of metal material coating process, etc., can solve the problems such as the corrosion resistance of the film layer needs to be improved, the eutrophication of the water body, the environment is not friendly, etc. Excellent corrosion resistance effect

Inactive Publication Date: 2018-12-21
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patents containing tin or zirconium all have certain practical prospects, but there are also one or more of the following problems: (1) the film-forming solution and the film layer contain phosphorus substances of different contents, which will cause Lead to eutrophication of water; (2) The conversion liquid contains organic polymer substances, which may cause environmental unfriendly problems; (3) The corrosion resistance of the film layer still needs to be improved; (4) The process is still relatively complicated

Method used

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  • Stannate/zirconate composite conversion solution for magnesium alloy surface treatment and preparation method and using method thereof
  • Stannate/zirconate composite conversion solution for magnesium alloy surface treatment and preparation method and using method thereof
  • Stannate/zirconate composite conversion solution for magnesium alloy surface treatment and preparation method and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of stannate / zirconate composite conversion solution for surface treatment of magnesium alloys

[0036] 1) 40g of sodium stannate, 15g of sodium acetate and 3g of citric acid were dissolved in 0.25L of deionized water to obtain solution A;

[0037] 2) 6 g of potassium fluozirconate was dissolved in 0.25 L of deionized water to obtain solution B;

[0038] 3) Dissolve 8g of sodium hydroxide and 30g of sodium carbonate in 0.25L of deionized water to obtain solution C;

[0039] 4) Mix solution A in step (1), solution B in step (2) and solution C in step (3), add deionized water to make the volume to 1L, and then add glacial acetic acid to adjust the pH to 11.

[0040] (2) AZ31 magnesium alloy is surface treated with the stannate / zirconate composite conversion solution prepared in step (1)

[0041]1) Grind the AZ31 magnesium alloy with 400#, 600#, 800#, 1200#, 1500# water-grinding sandpaper in sequence until the surface of the magnesium alloy is smooth and f...

Embodiment 2

[0048] (1) Preparation of stannate / zirconate composite conversion solution for surface treatment of magnesium alloys

[0049] 1) 30g of calcium stannate, 10g of sodium acetate and 4g of citric acid were dissolved in 0.25L of deionized water to obtain solution A;

[0050] 2) 4 g of ammonium fluozirconate was dissolved in 0.25 L of deionized water to obtain solution B;

[0051] 3) Dissolve 6g of sodium hydroxide and 20g of sodium carbonate in 0.25L of deionized water to obtain solution C;

[0052] 4) Mix solution A in step (1), solution B in step (2) and solution C in step (3), add deionized water to make the volume to 1L, and then add sodium hydroxide to adjust the pH to 10.

[0053] (2) AZ31 magnesium alloy is surface treated with the stannate / zirconate composite conversion solution prepared in step (1)

[0054] 1) Grind the AZ31 magnesium alloy with 400#, 600#, 800#, 1200#, 1500# water-grinding sandpaper in sequence until the surface of the magnesium alloy is smooth and fla...

Embodiment 3

[0061] (1) Preparation of stannate / zirconate composite conversion solution for surface treatment of magnesium alloys

[0062] 1) 25g potassium stannate, 25g sodium stannate, 18g sodium acetate and 2g citric acid were dissolved in 0.25L deionized water to obtain solution A;

[0063] 2) Dissolve 2g of sodium fluozirconate in 0.25L of deionized water to obtain solution B;

[0064] 3) Dissolve 4g of sodium hydroxide and 10g of sodium carbonate in 0.25L of deionized water to obtain solution C;

[0065] 4) Mix solution A in step (1), solution B in step (2) and solution C in step (3), add deionized water to make the volume to 1L, and then add glacial acetic acid to adjust the pH to 9.

[0066] (2) AZ31 magnesium alloy is surface treated with the stannate / zirconate composite conversion solution prepared in step (1)

[0067] 1) Grind the AZ31 magnesium alloy with 400#, 600#, 800#, 1200#, 1500# water-grinding sandpaper in sequence until the surface of the magnesium alloy is smooth and...

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Abstract

The invention relates to a stannate / zirconate composite conversion solution for magnesium alloy surface treatment and a preparation method and using method thereof, and belongs to the technical fieldof magnesium alloy surface treatment. The composite conversion solution comprises 30-50 g / L of stannate, 2-6 g / L of zirconate, 4-8 g / L of sodium hydroxide, 10-18 g / L of sodium acetate, 2-4 g / L of citric acid and 10-30 g / L of sodium carbonate, and the pH value of the composite conversion solution is 9-11. The composite conversion solution is an environmental-friendly conversion solution, a composite conversion film generated on the surface of a magnesium alloy after the treatment by the composite conversion solution is further environmental friendly, the surface of the film is smooth, level, compact and good in corrosion resistance, the self- corrosion current density is two orders of magnitude lower than that of a magnesium alloy base body, the corrosion resistance of the magnesium alloy is improved, and foundation is laid for follow-up protection treatment. The composite conversion solution is simple in industrial preparation and easy to operate, does not need complex equipment, is suitable for industrial production, and is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and in particular relates to a stannate / zirconate composite conversion solution for magnesium alloy surface treatment and a preparation method and application method thereof. Background technique [0002] Magnesium alloy is the lightest metal structure material currently used. It has a series of unique properties and advantages such as low density, high specific strength, strong electromagnetic shielding, and recyclable reuse. It has been widely used in automobiles, electronics, aviation and other fields. Wide range of applications, known as "21st century green engineering materials". However, the easy-to-corrosion property of magnesium alloys has become a bottleneck problem restricting the development and application of magnesium alloys. In order to break through the shackles of this bottleneck problem, the industry often uses surface protection technologies such as an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60C23C22/73C23C22/78
CPCC23C22/60C23C22/73C23C22/78
Inventor 曹献龙邓洪达余大亮兰伟
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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