Film forming solution for magnesium alloy chemical composition coating and preparation thereof

A chemical conversion coating, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problem of low adhesion of magnesium alloy chemical conversion coating paint film, achieve good corrosion resistance and wear resistance, low surface resistance, The effect of reducing pollution

Inactive Publication Date: 2009-07-01
深圳市新合富力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defect that the paint film adhesion of the magnesium alloy chemical conversion film formed by the film-forming solution and the surface treatment method in the above-mentioned prior art is low, and to provide a paint film that makes the chemical conversion film of magnesium alloy A film-forming solution for a magnesium alloy chemical conversion film with high adhesion and good corrosion resistance and wear resistance, and a preparation method for a magnesium alloy chemical conversion film is also provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of the magnesium alloy chemical conversion film also provided by the present invention comprises: immersing the magnesium alloy material in the pickling activation solution for acid pickling activation; then immersing the magnesium alloy material after pickling and activation After 1-30 minutes in the solution, a chemical conversion film is formed on the surface of the magnesium alloy material, and the film-forming solution is the film-forming solution provided by the present invention.

[0023] According to the preparation method provided by the present invention, the pickling activation method includes immersing the magnesium alloy in a pickling activation solution with a temperature of 30-100°C and a pH value of 3.5-6.5 for 0.5-30 minutes, and preferably adopts ultrasonic vibration ; The pickling activation solution is an aqueous solution containing an organic solvent, thiourea, salt and acid; the organic solvent is one or more of isopropanol, e...

Embodiment 1

[0035] The sample used is ZA88 die-casting magnesium alloy workpiece.

[0036] 1. Mechanical treatment

[0037] After the above samples were polished with 800-grit sandpaper, they were then polished with 1200-grit sandpaper until fresh magnesium alloy was exposed. Then rinse off with tap water, wash with pure water, and dry with a hair dryer.

[0038] 2. Pickling activation

[0039] Add 40ml of isopropanol, 20g of potassium dihydrogen phosphate, 30g of sodium carbonate, 70ml of acetic acid (concentration: 99.5%), 80g of boric acid and 0.01g of thiourea into 700ml of pure water, then add pure water to 1L to make pickling activation solution . The above treated sample was immersed in the pickling activation solution at 50° C. and pH 3.5, and was pickled and activated under ultrasonic vibration for 20 minutes. The samples were then rinsed with tap water and washed with pure water.

[0040] 3. Film formation

[0041] Add 40g of ceric sulfate, 30ml of concentrated sulfuric ac...

Embodiment 2

[0048] The sample used is ZA124 die-casting magnesium alloy workpiece.

[0049] 1. Mechanical treatment

[0050] After the above samples were polished with 800-grit sandpaper, they were then polished with 1200-grit sandpaper until fresh magnesium alloy was exposed. Rinse well with tap water, wash with pure water, and blow dry with a hair dryer.

[0051] 2. Pickling activation

[0052] Add 90ml of acetone, 50g of sodium citrate, 50g of sodium acetate, 40ml of acetic acid (concentration of 99.5%), 30ml of polyphosphoric acid (concentration of 80%), 20ml of oxalic acid (concentration of 99.5%), and 1g of thiourea into 700ml of pure water , and then add pure water to 1L to make pickling activation solution. The above treated sample was immersed in the pickling activation solution at 70° C. and pH 6.5, and was pickled and activated under ultrasonic vibration for 15 minutes. The samples were then rinsed with tap water and washed with pure water.

[0053] 3. Film formation

[0...

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Abstract

The invention provides a magnesium alloy chemical conversion film forming solution, wherein the film forming solution is a water solution containing ceric sulfate, sulphuric acid, phytic acid, an inhibiter and a buffering agent and has a pH value between 2 and 6. The invention further provides a method for preparing the magnesium alloy chemical conversion film. The chemical conversion film obtained by the film forming solution and the method for preparing the magnesium alloy chemical conversion film has high adhesive attraction of the paint film, good corrosion resistance and wearing resistance, good compactability of the film and low electric resistance.

Description

technical field [0001] The invention relates to a film-forming solution of a magnesium alloy chemical conversion film, and also relates to a preparation method of the magnesium alloy chemical conversion film. Background technique [0002] Magnesium alloys are widely used in automobiles, electronic communications, aerospace and other fields because of their advantages such as high specific strength and specific stiffness, excellent electromagnetic shielding performance, easy machining, easy recycling, and rich natural reserves, so they are known as "21st century green engineering materials". [0003] Currently the most widely used magnesium alloys Mg-Al and Mg-Al-Zn alloys will precipitate unstable discontinuous precipitates of Mg during the aging process 17 Al 12 , resulting in poor creep properties and high-temperature mechanical properties of magnesium alloys, and cannot be applied to occasions where the temperature is higher than 120°C. Therefore, higher requirements a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/48C23C22/57C23G1/02C23G1/14
Inventor 连俊兰苏炜
Owner 深圳市新合富力科技有限公司
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