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Preparation method of a micro-arc oxidation/intelligent slow-release structure integrated composite coating on the surface of magnesium alloy

A technology of micro-arc oxidation and composite coating, which is applied in the field of metal surface treatment, can solve the problems of inability to successfully build a sustained-release structure, large structural size of sustained-release capsules, and poor mechanical strength, and achieve optimal pH response swelling and slow-release characteristics, Ensure mechanical stability and improve accuracy

Inactive Publication Date: 2020-03-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, there are only smart response sustained-release capsules and stimuli-responsive hydrogels as pH-responsive sustained-release structures. However, the sustained-release capsules are large in size and cannot be introduced
Hydrogel has a good stimulus-response slow-release effect, but its mechanical strength is poor, and it cannot successfully build a sustained-release structure in the traditional coating structure. It is necessary to seek a carrier structure with good mechanical properties for self-healing coatings.

Method used

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  • Preparation method of a micro-arc oxidation/intelligent slow-release structure integrated composite coating on the surface of magnesium alloy
  • Preparation method of a micro-arc oxidation/intelligent slow-release structure integrated composite coating on the surface of magnesium alloy
  • Preparation method of a micro-arc oxidation/intelligent slow-release structure integrated composite coating on the surface of magnesium alloy

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preparation example Construction

[0025] The invention provides a method for preparing a MAO film / intelligent slow-release structure integrated composite coating on the surface of a magnesium alloy. First, a layer of dense MOA skeleton structure is prepared on the surface of the magnesium alloy. On this basis, n-alkyl methacrylic acid Ester changes the hydrophobic unit of the copolymer, adjusts the concentration required for ionization, introduces polyethylene glycol group grafting, and constructs a hydrophobic stable complex of hydrogen bonds between the polymer networks. In addition, the polymer network is grafted and modified by vinyl silane , using the -Si-OH of the silane branch to condense with the -OH group on the surface of the pore wall of the MAO membrane to form a Mg-O-Si bond, forming a pinning effect, thereby improving the mechanical stability of the sustained-release structure. Finally, the MAO / SRH integrated self-healing coating is realized.

[0026] The method specifically includes the followin...

Embodiment 1

[0043] 1. Configuration of micro-arc oxidation. Put the magnesium alloy test piece with AZ91D as the substrate into the electrolyte and perform micro-arc oxidation treatment. The composition of the micro-arc oxidation electrolyte is: sodium phosphate 9g / L, sodium hydroxide 8g / L, and the rest is deionized water; micro-arc oxidation Oxidation control parameters are: mother wave voltage is 420V, wavelet voltage is 165V, carrier frequency is 1100Hz, treatment time is 45 minutes, oxide film thickness is 26±2μm, the oxide film is a porous ceramic film with a porosity of 32%~ 35%, and the pore size is 1-3 μm.

[0044] 2. Polymerization solution preparation. Mix n-AMA and PEGMA to form, n-AMA and PEGMA are mixed and stirred at a molar ratio of n(n-AMA):n(PEGMA)=4.2:3.

[0045] 3. Hydrosol modification reaction preparation. After mixing the polymerization solution, the crosslinking agent, the graft modifier, and deionized water in parts by weight, the mixture is continuously stirred...

Embodiment 2

[0051] 1. Configuration of micro-arc oxidation. Put the magnesium alloy test piece with ZM6 as the matrix into the electrolyte, and perform micro-arc oxidation treatment. The composition of the micro-arc oxidation electrolyte is: sodium phosphate 15g / L, sodium hydroxide 12g / L, sodium borate 10g / L, and the rest are Deionized water; micro-arc oxidation control parameters are: mother wave voltage is 520V, wavelet voltage is 170V, carrier frequency is 1300Hz, treatment time is 55 minutes, oxide film thickness is 27±1μm, the oxide film is a porous ceramic film, The porosity is 37% to 40%, and the pore diameter is 3 to 6 μm.

[0052] 2. Polymerization solution preparation. Mix n-AMA and PEGMA to form, n-AMA and PEGMA are mixed and stirred at a molar ratio of n(n-AMA):n(PEGMA)=6:2.5.

[0053] 3. Hydrosol modification reaction preparation. After mixing the polymerization solution, the crosslinking agent, the graft modifier, and deionized water in parts by weight, the mixture is con...

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Abstract

The invention discloses a preparation method of a magnesium alloy surface micro-arc oxidation / intelligent slow-release structure integrated composite coating, and belongs to the technical field of metal surface treatment. The method comprises the steps that a layer of compact micro-arc oxidation film framework structure is formed on the surface of magnesium alloy, then, a magnesium alloy sample with the micro-arc oxidation film (MAO) framework structure is immersed into modified hydrogel, and after the modified hydrogel is loaded with a corrosion inhibitor, the micro-arc oxidation / intelligentslow-release structure integrated composite coating is formed on the surface of the magnesium alloy. The prepared MAO film metallurgically combined with a matrix restrains the stripping effect of damage boundary position matrix filiform corrosion on the coating, the hydrogel in microholes forms a micro-nano slow-release structure with the reliable mechanics guarantee and responses to the micro-area corrosion in a long-acting mode to release the corrosion inhibitor, and corrosion self restraining is achieved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for preparing a magnesium alloy surface micro-arc oxidation / intelligent slow-release structure integrated composite coating. Background technique [0002] The long-term service reliability of magnesium alloy structural parts, especially bearing parts, is still difficult to guarantee. The root cause is that the coating is often damaged by external forces during long-term service. The existing magnesium alloy coating has limited corrosion self-repair ability, which seriously endangers magnesium alloy structural parts. The key to solving the above problems is to prepare a magnesium alloy coating with a self-repairing function of damage. However, traditional magnesium alloy coatings mainly include organic coatings, metal coatings, and oxide film layers. These three types of coatings can only form physical adhesion to the substrate. When corrosion occurs, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C23F11/10
CPCC23F11/10C25D11/30
Inventor 杜克勤郭泉忠郭兴华王勇杜佳楠
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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