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Corrosion-inhibiting microcapsules, preparation method thereof, magnesium alloy micro-arc oxidation electrolyte containing same and application thereof

A technology of micro-arc oxidation and magnesium alloy, which is applied in the field of electrolyte, can solve the problems of uniform corrosion, coating corrosion, and easily damaged micro-arc oxidation coating, and achieve long-term protection, small roughness, Good corrosion resistance effect

Active Publication Date: 2021-05-04
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the micro-arc oxidation coating is easily damaged during use, causing corrosion of the coating in the damaged area, and then localized corrosion that is more harmful than uniform corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] On the one hand, the present invention provides a kind of preparation method of corrosion-inhibiting microcapsules, and described preparation method comprises the steps:

[0021] (a) After adding polyvinyl alcohol, urea, ammonium chloride, resorcinol and emulsifier into water and mixing, adjust the pH of the reaction solution to alkaline, and react;

[0022] (b) adding linseed oil and a corrosion inhibitor to the reaction solution to obtain an emulsion;

[0023] (c) adding formaldehyde to the obtained emulsion, and reacting;

[0024] (d) adjusting the pH of the reaction solution to acidity, and continuing the reaction;

[0025] (e) cooling the reaction liquid, separating, purifying and drying to obtain corrosion-inhibiting microcapsules.

[0026] The corrosion-inhibiting microcapsules provided by the present invention can endow the coating with a biomimetic self-repair function on the basis of ordinary coatings. After the ordinary coating is destroyed, the microcapsul...

Embodiment 1

[0065] Follow the steps below to prepare corrosion-inhibiting microcapsules:

[0066] (1) Add 2g polyvinyl alcohol (PVA-1788), 5g urea, 0.5g ammonium chloride, 0.5g resorcinol, 8g OP-10 into the reactor, add 250m L of water and fully stir and mix evenly. 1mol / L NaOH to adjust the pH of the solution to 8-9, raise the temperature to 55-60°C, and keep it warm for 30min;

[0067] (2) In the above solution, add a mixture of 25g linseed oil and 5g 2-mercaptobenzothiazole to form an emulsion and stabilize it for 20min;

[0068] (3) Add 10.1 g of 37% formaldehyde aqueous solution into the emulsion and react for 1 h;

[0069] (4) Use 1mol / L hydrochloric acid to adjust the pH of the emulsion to 2-3.5, and continue to react for 3 hours;

[0070] (5) Cool the synthesized suspension of corrosion-inhibiting microcapsules to room temperature, then perform suction filtration, rinse with deionized water, and then dry at 40° C. for 24 hours to obtain corrosion-inhibiting microcapsules.

[00...

Embodiment 2

[0085] Follow the steps below to prepare corrosion-inhibiting microcapsules:

[0086] (1) Add 2.4g polyvinyl alcohol (PVA-1788), 6.5g urea, 0.7g ammonium chloride, 0.6g resorcinol, 6.5g OP-10 into the reactor, add 250m L water and stir well Evenly, adjust the pH of the solution to 8-9 with 1mol / L NaOH, raise the temperature to 55-60°C, and keep it warm for 30min;

[0087] (2) In the above solution, add a mixture of 35.75g linseed oil and 7.15g benzotriazole to form an emulsion and stabilize it for 20min;

[0088] (3) Add 9.7g of 37% formaldehyde aqueous solution into the emulsion and react for 1h;

[0089] (4) Use 1mol / L hydrochloric acid to adjust the pH of the emulsion to 2-3.5, and continue to react for 3 hours;

[0090] (5) Cool the synthesized suspension of corrosion-inhibiting microcapsules to room temperature, then perform suction filtration, rinse with deionized water, and then dry at 40° C. for 24 hours to obtain corrosion-inhibiting microcapsules.

[0091] Sodium ...

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Abstract

The invention provides corrosion-inhibiting microcapsules, a preparation method thereof, a magnesium alloy micro-arc oxidation electrolyte containing the same, and applications. The preparation method of the invention comprises the following steps: adding polyvinyl alcohol, urea, ammonium chloride, resorcinol and an emulsifier into water for mixing, adjusting pH to alkaline, and reacting; adding linseed oil and a corrosion inhibitor to the reaction solution, an emulsion is obtained; formaldehyde is added to the obtained emulsion and reacted; the pH is adjusted to acidity, and the reaction is continued; the reaction solution is cooled, separated, purified and dried to obtain corrosion-inhibited microcapsules. The magnesium alloy micro-arc oxidation electrolyte of the invention does not contain harmful elements such as Cr, P, F, etc., which provides an application basis for the industrialization direction of the magnesium alloy micro-arc oxidation of environmental protection and pollution-free; at the same time, it can be used on the surface of magnesium alloy. A coating with uniform micropore distribution, small roughness and good corrosion resistance is formed; since the micro-arc oxidation coating contains corrosion-inhibiting microcapsules, it can still provide long-term protection for magnesium alloys after the coating is damaged.

Description

technical field [0001] The invention relates to the field of electrolytes, in particular to corrosion-inhibiting microcapsules, a preparation method thereof, a magnesium alloy micro-arc oxidation electrolyte containing the same, and applications. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good shock absorption, strong electromagnetic shielding and radiation resistance, etc. It has broad application prospects in the fields of aviation, automobiles, electronics, ships, construction and 3C, and has become a new industry in the world. Hotspots in material research and use. [0003] The corrosion resistance of magnesium alloys is the lowest among commonly used metal structural materials, and galvanic corrosion is prone to occur, which has become a key problem limiting the application of magnesium alloys. The commonly used surface treatment technologies for magnesium alloys in practice mainly include micro-arc oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/08C25D11/30
CPCC23F11/08C25D11/026C25D11/30
Inventor 屠晓华李加友缪程平张洋徐雅玲于建兴
Owner JIAXING UNIV
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