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A kind of preparation method of magnesium-nickel hydrotalcite/micro-arc oxidation composite coating

A technology of micro-arc oxidation and composite coating, which is applied in the direction of coating, anodizing, and superimposed layer plating to achieve the effect of no pollution, low cost, and widening the scope of application.

Active Publication Date: 2019-10-15
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, very little research has been done on the development of composite coatings of MAO combined with hydrotalcite on magnesium alloys.

Method used

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  • A kind of preparation method of magnesium-nickel hydrotalcite/micro-arc oxidation composite coating
  • A kind of preparation method of magnesium-nickel hydrotalcite/micro-arc oxidation composite coating
  • A kind of preparation method of magnesium-nickel hydrotalcite/micro-arc oxidation composite coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) The magnesium alloy is pretreated by grinding, washing and drying;

[0022] 2) Add water to sodium silicate, sodium phosphate, and sodium hydroxide to prepare an electrolyte solution containing 10g / L sodium silicate, 10g / L sodium phosphate, and 5g / L sodium hydroxide, and place the pretreated magnesium alloy in the electrolytic In the solution, the micro-arc oxidation is carried out in the constant current mode, the micro-arc oxidation treatment time is 20min, and the frequency is 800Hz;

[0023] 3) Mix nickel nitrate and ammonium nitrate with water to prepare a mixed solution containing 0.03 mol / L nickel nitrate and 0.05 mol / L ammonium nitrate, adjust its pH to 6 with 1 wt.% ammonia water, and place the magnesium alloy after micro-arc oxidation In the mixed solution, the hydrothermal reaction was carried out at 80°C for 1 hour to prepare the magnesium-nickel hydrotalcite / micro-arc oxidation composite coating.

[0024] figure 1 It is the EDS diagram of magnesium-nic...

Embodiment 2

[0030] 1) The magnesium alloy is pretreated by grinding, washing and drying;

[0031] 2) Add water to sodium silicate, sodium phosphate, and sodium hydroxide to prepare an electrolyte solution containing 5g / L sodium silicate, 5g / L sodium phosphate, and 1g / L sodium hydroxide, and place the pretreated magnesium alloy in the electrolytic In the solution, the micro-arc oxidation is carried out in the constant current mode, the micro-arc oxidation treatment time is 20min, and the frequency is 800Hz;

[0032] 3) Mix nickel nitrate and ammonium nitrate with water to prepare a mixed solution containing 0.01mol / L nickel nitrate and 0.01mol / L ammonium nitrate, adjust the pH to 5 with 1wt.% ammonia water, and place the magnesium alloy after micro-arc oxidation In the mixed solution, the hydrothermal reaction was carried out at 50°C for 24 hours to prepare the magnesium-nickel hydrotalcite / micro-arc oxidation composite coating.

Embodiment 3

[0034] 1) The magnesium alloy is pretreated by grinding, washing and drying;

[0035] 2) Add water to sodium silicate, sodium phosphate, and sodium hydroxide to prepare an electrolyte solution containing 30g / L sodium silicate, 20g / L sodium phosphate, and 10g / L sodium hydroxide, and place the pretreated magnesium alloy in electrolytic In the solution, the micro-arc oxidation is carried out in the constant current mode, the micro-arc oxidation treatment time is 20min, and the frequency is 800Hz;

[0036] 3) Mix nickel nitrate and ammonium nitrate with water to prepare a mixed solution containing 0.05 mol / L nickel nitrate and 0.1 mol / L ammonium nitrate, adjust its pH to 9 with 1wt.% ammonia water, and place the magnesium alloy after micro-arc oxidation In the mixed solution, the hydrothermal reaction was carried out at 120°C for 2 hours to prepare the magnesium-nickel hydrotalcite / micro-arc oxidation composite coating.

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Abstract

The invention relates to a preparation method of a magnesium-nickel hydrotalcite / micro-arc oxidation composite coating layer. The preparation method comprises the steps of firstly, carrying out micro-arc oxidation on pretreated magnesium alloy, and carrying out hydrothermal reaction, so as to form a magnesium-nickel hydrotalcite coating layer on the surface of a micro-arc oxidation layer of the magnesium alloy. The magnesium-nickel hydrotalcite / micro-arc oxidation composite coating layer has high impedance modulus and is capable of effectively improving the corrosion resistance of the surfaceof magnesium alloy. Besides, the preparation method is simple in process, easy to operate and low in cost and has wide popularization feasibility.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a preparation method of a magnesium-nickel hydrotalcite / micro-arc oxidation composite coating. Background technique [0002] Magnesium and its alloys are widely used in automobile manufacturing, aerospace and other fields due to their low density, high strength, good biocompatibility and many other excellent properties. However, magnesium alloys have high chemical activity and are prone to corrosion, which limits the industrial application of magnesium alloys. Therefore, it is necessary to modify the surface of magnesium alloys to improve the corrosion resistance of the alloys. [0003] Surface treatment technologies such as ultrasonic-assisted electroless plating, stannate conversion coating, and lanthanum conversion coating can effectively improve the corrosion resistance of magnesium alloys, but these coatings are either harmful or costly, and are not suita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C25D11/30C23C18/12
Inventor 陈俊锋林文鑫梁思琰任魏巍陈凯锋
Owner FUZHOU UNIV
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