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A kind of preparation method of magnesium alloy magnesium manganese hydrotalcite/micro-arc oxidation corrosion-resistant coating

An alloy magnesium manganese water, micro-arc oxidation technology, applied in metal material coating process, coating, anodizing and other directions, can solve the problems of increasing cost and technological process, complex preparation process, accelerated alloy corrosion, etc., to reduce corrosion Current density, broad application prospects, effect of delaying corrosion rate

Active Publication Date: 2021-03-30
福建永福汇能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are very few studies on magnesium alloy micro-arc oxidation / hydrotalcite coating and the preparation process is complicated, which requires the introduction of additional divalent ions, which increases the cost and process flow
[0006] There are a large number of cracks and holes in the micro-arc oxidation coating of magnesium alloys. These coarse cracks and holes can easily form corrosion channels, thereby accelerating the corrosion of the alloy.

Method used

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  • A kind of preparation method of magnesium alloy magnesium manganese hydrotalcite/micro-arc oxidation corrosion-resistant coating
  • A kind of preparation method of magnesium alloy magnesium manganese hydrotalcite/micro-arc oxidation corrosion-resistant coating
  • A kind of preparation method of magnesium alloy magnesium manganese hydrotalcite/micro-arc oxidation corrosion-resistant coating

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Effect test

Embodiment 1

[0027] Embodiment 1 The preparation method of magnesium manganese hydrotalcite / micro-arc oxidation coating

[0028] (1) Pretreatment: Grinding the surface of the magnesium alloy sample smooth, then washing and drying;

[0029] (2) Magnesium alloy micro-arc oxidation: the dried magnesium alloy sample was subjected to micro-arc oxidation in constant current mode, the treatment time was 20 minutes, and the frequency was 800 Hz to obtain a manganese-micro-arc oxidation sample; the electrolyte composition of micro-arc oxidation was as follows : Sodium silicate 20g / L, potassium hydroxide 30g / L, potassium fluoride 10g / L, potassium permanganate 2g / L.

[0030] (3) Hydrothermal reaction: The manganese-micro-arc oxidation sample obtained in step (2) was placed in deionized water for hydrothermal reaction. The reaction temperature was 120°C and the reaction time was 15 hours. Arc oxidation coating.

Embodiment 2

[0032] (1) Pretreatment: Grinding the surface of the magnesium alloy sample smooth, then washing and drying;

[0033] (2) Magnesium alloy micro-arc oxidation: the dried magnesium alloy sample was subjected to micro-arc oxidation in constant current mode, the treatment time was 5 minutes, and the frequency was 600 Hz to obtain a manganese-micro-arc oxidation sample; the electrolyte composition of micro-arc oxidation was as follows : Sodium silicate 5g / L, potassium hydroxide 5g / L, potassium fluoride 1g / L, potassium permanganate 1g / L.

[0034] (3) Hydrothermal reaction: The manganese-micro-arc oxidation sample obtained in step (2) was placed in deionized water for hydrothermal reaction. Arc oxidation coating.

Embodiment 3

[0036] (1) Pretreatment: Grinding the surface of the magnesium alloy sample smooth, then washing and drying;

[0037] (2) Magnesium alloy micro-arc oxidation: The dried magnesium alloy sample was subjected to micro-arc oxidation in constant current mode, the treatment time was 10 minutes, and the frequency was 700 Hz to obtain a manganese-micro-arc oxidation sample; the electrolyte composition of micro-arc oxidation was as follows : Sodium silicate 10g / L, potassium hydroxide 10g / L, potassium fluoride 5g / L, potassium permanganate 2g / L.

[0038] (3) Hydrothermal reaction: The manganese-micro-arc oxidation sample obtained in step (2) was placed in deionized water for hydrothermal reaction. The reaction temperature was 120°C and the reaction time was 15 hours. Arc oxidation coating.

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Abstract

The invention discloses a magnesium alloy surface coating with excellent corrosion resistance. A pre-processed magnesium alloy sample is subjected to micro-arc oxidation in advance, then the micro-arcoxidized sample is placed in deionized water for hydrothermal reaction, and finally a magnesium-manganese hydrotalcite / micro-arc oxidation coating is formed on the surface of the alloy. The coatingprepared by the invention has lower corrosion current density, not only holes and cracks in the micro-arc oxidation layer can be effectively repaired, but also negative ions in etchant solution can bewell adsorbed, so that the corrosion resistance of the alloy is effectively improved. The method is simple in process, easy to operate, low in cost and wide in popularization feasibility.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment technology, in particular to a preparation method of a magnesium alloy magnesium manganese hydrotalcite / micro-arc oxidation corrosion-resistant coating. Background technique [0002] Magnesium and its alloys have good mechanical and physical properties, such as high specific strength, good impact resistance, good shock absorption, good electromagnetic shielding, good biocompatibility, etc., so they are widely used in automotive lightweight, aerospace and electronics industries. ideal material for the field. However, its disadvantage is poor corrosion resistance, so it cannot be used on a large scale, so the industry often performs surface treatment on magnesium alloys to improve their corrosion resistance. [0003] Surface treatment of magnesium alloys such as chemical oxidation, anodic oxidation, and metal coating can improve the corrosion resistance of the alloy, but there are also problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C23C18/12C23C28/04
Inventor 陈俊锋符殿宝林文鑫陈玉龙
Owner 福建永福汇能科技有限公司
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