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Zinc phosphate chemical conversion-hydrothermal compounding protection film and preparation method thereof

A kind of zinc phosphate chemistry and zinc phosphate technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problem of weak substrate bonding, chemical conversion film film thickness limited microscopic cracks, Poor stability of superhydrophobic film and other problems, to achieve excellent corrosion resistance, good hydrophobicity and even superhydrophobic characteristics, and improve corrosion resistance

Active Publication Date: 2020-02-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention overcomes the deficiencies in the prior art, in view of the limited film thickness of the chemical conversion film, the loose structure and the existence of a large number of microscopic cracks and defects, and the super-hydrophobic film has defects such as poor stability and weak binding force with the substrate , which restricts the development and application of magnesium alloys, provides a zinc phosphate chemical conversion-hydrothermal composite protective film and its preparation method and application, in order to significantly improve the corrosion resistance of magnesium alloys, thereby further expanding the application of magnesium alloys scope of use

Method used

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  • Zinc phosphate chemical conversion-hydrothermal compounding protection film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] (1) According to 5.0g / LNa 2 HPO 4 , 6.0g / LZn(NO 3 ) 2 , 6.0g / LNaNO 2 , 4.0g / LNaF ratio to prepare zinc phosphate conversion solution, and use phosphoric acid to adjust the pH value of the solution to about 2.0.

[0032] (2) Put the beaker containing the above-mentioned zinc phosphate solution into a constant temperature water bath, and heat it to 40° C. to keep it warm.

[0033] (3) Put the magnesium alloy sample into the zinc phosphate solution, and carry out chemical conversion treatment for 10 minutes under slow stirring. After the experiment, the samples were taken out, washed with deionized water, and air-dried naturally.

[0034] (4) Weigh Zn(NO 3 ) 2 with C 6 h 5 Na 3 o 7 2H 2 O, and dissolved in 40mL of deionized water to make a mixed solution; then 0.05g / 10mL of CH 3 (CH 2 ) 16 After COOH was added to the mixture, it was magnetically stirred for 20 minutes, and after stirring evenly, the pH value of the solution was adjusted to 8 with ammonia wat...

Embodiment 2

[0038] (1) According to 10.0g / LNa 2 HPO 4 , 8.0g / LZn (NO 3 ) 2 , 6.0g / LNaNO 2 , the ratio of 6.0g / LNaF to prepare zinc phosphate conversion solution, and use phosphoric acid to adjust the pH value of the solution to about 3.0.

[0039] (2) Put the beaker containing the above-mentioned zinc phosphate solution into a constant temperature water bath, and heat it to 50° C. to keep it warm.

[0040] (3) Put the magnesium alloy sample into the zinc phosphate solution, and carry out chemical conversion treatment for 15 minutes under slow stirring. After the experiment, the samples were taken out, washed with deionized water, and air-dried naturally.

[0041] (4) Weigh Zn(NO 3 ) 2 with C 6 h 5 Na 3 o 7 2H 2 O, and dissolved in 40mL of deionized water to make a mixed solution; then 0.10g / 10mL of CH 3 (CH 2 ) 16 After COOH was added to the mixture, it was stirred magnetically for 20 minutes. After stirring evenly, the pH value of the solution was adjusted to 9 with ammoni...

Embodiment 3

[0045] (1) According to 15.0g / LNa 2 HPO 4 , 10.0g / LZn (NO 3 ) 2 , 8.0g / LNaNO 2 , 8.0g / LNaF ratio to prepare zinc phosphate conversion solution, and use phosphoric acid to adjust the pH value of the solution to about 2.8.

[0046] (2) Put the beaker containing the above-mentioned zinc phosphate solution into a constant temperature water bath, and heat it to 60° C. to keep it warm.

[0047] (3) Put the magnesium alloy sample into the zinc phosphate solution, and carry out chemical conversion treatment for 25 minutes under slow stirring. After the experiment, the samples were taken out, washed with deionized water, and air-dried naturally.

[0048] (4) Weigh Zn(NO 3 ) 2 with C 6 h 5 Na 3 o 7 2H 2 O, and dissolved in 40mL of deionized water to make a mixed solution; then 0.20g / 10mL of CH 3 (CH 2 ) 16 After COOH was added to the mixture, it was stirred magnetically for 20 minutes. After stirring evenly, the pH value of the solution was adjusted to 10 with ammonia wat...

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Abstract

The invention discloses a zinc phosphate chemical conversion-hydrothermal compounding protection film and a preparation method thereof. The method comprises the steps that disodium hydrogen phosphate,zinc nitrate, sodium nitrite and sodium fluoride acid are prepared into a zinc phosphate solution, phosphoric acid is adopted for adjusting the pH of the zinc phosphate solution, and water bath heatpreservation is performed; a magnesium alloy sample is placed in the zinc phosphate solution, and after a stirring reaction is performed, the sample is taken out, cleaned and air-dried; the zinc nitrate and trisodium citrate dihydrate are dissolved in deionized water for preparing a mixed solution, then stearic acid is added to the mixed solution for stirring, and after even stirring is performed,the pH of the solution is adjusted by adopting ammonium hydroxide; the mixed solution is placed in a reaction kettle, then the magnesium alloy sample is placed in the reaction kettle, and heat preservation is conducted for 10-40 hours at 80-230 DEG C; and after the reaction kettle is naturally cooled to the room temperature, the sample is taken out, washed through the deionized water and dried toobtain the zinc phosphate chemical conversion-hydrothermal compounding protection film. According to the zinc phosphate chemical conversion-hydrothermal compounding protection film, the corrosion-resistance performance of magnesium alloy can be obviously improved, and accordingly the application range of the magnesium alloy is further enlarged.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface corrosion resistance protection, and more specifically relates to a zinc phosphate chemical conversion-hydrothermal composite protective film, a preparation method and application thereof. Background technique [0002] Magnesium and its alloys have the advantages of small specific gravity, high specific strength, strong shock absorption and electromagnetic shielding performance, and good biocompatibility. They are known as green materials in the 21st century and are used in automobiles, aerospace, electronics, military and nuclear energy. , biomedical and other industries have a wide range of potential applications. However, the chemical activity of magnesium is high, the standard electrode potential is -2.37V, and the surface film of magnesium alloy is loose and porous, so the corrosion resistance of magnesium alloy is not high, which seriously restricts the development and wide a...

Claims

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Application Information

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IPC IPC(8): C23C22/36C23C18/12
CPCC23C18/1204C23C22/362
Inventor 王吉会袁静胡文彬
Owner TIANJIN UNIV
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