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Super-hydrophobic anticorrosive coating for magnesium alloy and preparation method of super-hydrophobic anticorrosive coating

A technology of anti-corrosion coating and super-hydrophobic coating, which is applied in anti-corrosion coatings, coatings, polyurea/polyurethane coatings, etc., can solve the problems of reduced service life, poor corrosion resistance, and high chemical activity of magnesium, and achieve low energy consumption and easy The effect of low price and simple preparation process

Pending Publication Date: 2022-03-22
TSINGHUA INNOVATION CENT IN DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium itself has high chemical activity and poor corrosion resistance, which leads to the chemical and electrochemical reactions of magnesium alloys with the surrounding environment in the use environment, which greatly reduces the service life of magnesium alloy products and even poses serious safety hazards.

Method used

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Examples

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Effect test

preparation example Construction

[0043] A kind of preparation method that is used for the superhydrophobic anticorrosion coating of magnesium alloy provided by the invention, its preparation method comprises the following steps:

[0044] Step 1, preparing strontium phosphate chemical conversion coating;

[0045] Step 2, using the strontium phosphate chemical conversion coating to treat the magnesium alloy substrate, so as to cover the magnesium alloy substrate with a strontium phosphate anti-corrosion coating, effectively enhancing the corrosion resistance of the magnesium alloy substrate;

[0046] Step 3, prepare superhydrophobic coating;

[0047] Step 4, coating the super-hydrophobic coating on the magnesium alloy substrate prepared in the step 2, and obtaining a super-hydrophobic anti-corrosion coating after curing, so as to coat the magnesium alloy substrate with the strontium phosphate On the basis of the anti-corrosion coating, a super-hydrophobic coating is added to greatly improve the corrosion resis...

Embodiment 1

[0074] A kind of preparation method that is used for the superhydrophobic anticorrosion coating of magnesium alloy that the present embodiment provides, it is characterized in that, it comprises the following steps:

[0075] Step 1, take 21.16g (0.1mol) of strontium nitrate and 6.90g (0.06mol) of ammonium dihydrogen phosphate, add 1000g of deionized water, stir electromagnetically and slowly add concentrated nitric acid until all components are dissolved to obtain the strontium phosphate chemical conversion coating ;

[0076] Step 2, take the polished magnesium alloy substrate, place it in the strontium phosphate chemical conversion coating, react at 80°C for 5 minutes, take it out, wash it with deionized water for 5 minutes, put it in an oven and bake it at 80°C Dry for 10 minutes and set aside;

[0077] Step 3, get 2g (2.2wt%) particle diameter and be the hydrophobic nano-silica powder of 7nm, place in 78.95g organic solvent (the volume ratio of methyl ethyl ketone and tolu...

Embodiment 2

[0081] A kind of preparation method that is used for the superhydrophobic anticorrosion coating of magnesium alloy that the present embodiment provides, it is characterized in that, it comprises the following steps:

[0082] Step 1, take 108.80g (0.5mol) of strontium nitrate and 34.51g (0.3mol) of ammonium dihydrogen phosphate, add 1000g of deionized water, electromagnetically stir and slowly add concentrated nitric acid until all components are dissolved, and obtain the strontium phosphate chemical conversion coating ;

[0083] Step 2, take the polished magnesium alloy substrate, place it in the strontium phosphate chemical conversion coating, react at 80°C for 5 minutes, take it out, wash it with deionized water for 5 minutes, put it in an oven and bake it at 80°C Dry for 10 minutes and set aside;

[0084] Step 3, get 2g (2.2wt%) particle diameter and be the hydrophobic nano-silica powder of 7nm, place in 78.95g organic solvent (the volume ratio of methyl ethyl ketone and t...

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Abstract

The invention discloses a preparation method of a super-hydrophobic anticorrosive coating for magnesium alloy. The preparation method comprises the following steps: preparing a strontium phosphate chemical conversion coating; treating a magnesium alloy matrix by using the strontium phosphate chemical conversion coating; preparing a super-hydrophobic coating; the magnesium alloy matrix is coated with the super-hydrophobic coating, and the super-hydrophobic anticorrosive coating is obtained after curing; the invention further discloses the super-hydrophobic anticorrosive coating for the magnesium alloy. By adopting the strontium phosphate chemical conversion coating and the super-hydrophobic coating which are properly coordinated in formula and proportion, the super-hydrophobic coating is added to the magnesium alloy matrix on the basis of the strontium phosphate anticorrosive coating, so that the surface hydrophobicity of the magnesium alloy matrix is optimized on the premise that the magnesium alloy matrix has good corrosion resistance, and the corrosion resistance of the magnesium alloy matrix is improved. And the self-cleaning performance, the super-hydrophobic performance and the corrosion resistance of the magnesium alloy are further improved.

Description

technical field [0001] The invention relates to the technical field of metal surface modification, in particular to a superhydrophobic anticorrosion coating for magnesium alloys and a preparation method thereof. Background technique [0002] Corrosion of metals and their alloys in different environments is one of the important factors restricting their application. Metal materials can be corroded by chemical and electrochemical reactions with the surrounding environment during use, which will greatly reduce their strength and service life, and cause serious consequences such as environmental pollution, property loss, and casualties. According to statistics, in different countries and regions around the world, the expenditure related to metal corrosion accounts for 1-5% of the gross national product (GNP) every year. In my country, the expenditure caused by metal corrosion in 2014 alone was as high as 2,127.8 billion yuan, equivalent to 3.34% of the gross domestic product (G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D175/04C09D201/04C09D5/08C09D7/65
CPCC09D1/00C09D175/04C09D5/08C09D7/65C08K2201/011C08L101/04C08L101/06C08K3/36C08L75/04
Inventor 蒋永东柯冲张陈华
Owner TSINGHUA INNOVATION CENT IN DONGGUAN
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