Method for preparing graphene oxide and micro-arc oxidized ceramic composite coating on surface of magnesium alloy

A ceramic composite film and micro-arc oxidation technology, which is applied in anodic oxidation, metal material coating process, coating, etc., can solve the problems of poor corrosion resistance, achieve the effects of improved corrosion resistance, stable structure, and corrosion prevention

Inactive Publication Date: 2015-09-02
HARBIN INST OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the micro-arc oxidation ceramic film layer has a porous structure and has a large contact area with the corrosive medium during the corrosion process, resulting in poor corrosion resistance, and provides a method for preparing graphene oxide on the surface of magnesium alloys. Method for composite film layer with micro-arc oxidation ceramics

Method used

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  • Method for preparing graphene oxide and micro-arc oxidized ceramic composite coating on surface of magnesium alloy
  • Method for preparing graphene oxide and micro-arc oxidized ceramic composite coating on surface of magnesium alloy
  • Method for preparing graphene oxide and micro-arc oxidized ceramic composite coating on surface of magnesium alloy

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specific Embodiment approach 1

[0033] Specific embodiment one: this embodiment is a method for preparing graphene oxide and micro-arc oxidation ceramic composite film on the surface of magnesium alloy, which is completed in the following steps:

[0034] A method for preparing graphene oxide and micro-arc oxidation ceramic composite film layer on the surface of magnesium alloy is completed according to the following steps:

[0035] 1. Magnesium alloy pretreatment: Use 180#SiC sandpaper, 1000#SiC sandpaper and 2000#SiC sandpaper to polish the magnesium alloy in sequence to obtain a bright magnesium alloy;

[0036] 2. Ultrasonic treatment: immerse the magnesium alloy with a bright surface in acetone, and ultrasonically treat it for 3 minutes to 10 minutes at an ultrasonic power of 200W~300W to obtain the magnesium alloy after ultrasonic treatment;

[0037] 3. Degreasing: First, immerse the ultrasonically treated magnesium alloy in a NaOH solution with a temperature of 60°C-75°C and a concentration of 40g / L-50g...

specific Embodiment approach 2

[0052] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the magnesium alloy described in step 1 is a ZK60 magnesium alloy. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0053] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the graphene oxide film layer in the magnesium alloy covered with graphene oxide and micro-arc oxidation ceramic composite film layer described in step six The thickness is 4 μm to 6 μm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for preparing a graphene oxide and micro-arc oxidized ceramic composite coating on the surface of a magnesium alloy and relates to a method of preparing a coating on the surface of the magnesium alloy. The method is used for solving the problem of poor corrosion resistance of the micro-arc oxidized ceramic coating of a porous structure due to large contact area of the coating with a corrosive medium in the corrosion process. The method comprises the following steps: 1, magnesium alloy pre-processing; 2, ultrasonic processing; 3, oil removal; 4, micro-arc oxidization; 5, graphene oxide preparation; 6, application of the graphene oxide solution to the micro-arc oxidized ceramic coating on the magnesium alloy, thereby obtaining the magnesium alloy coated with the graphene oxide and micro-arc oxidized ceramic composite coating. According to the method, the corrosion current density of the graphene oxide and micro-arc oxidized ceramic composite coating is reduced to 14.5nA/cm<2>, which is 1/7240 of the corrosion current of the matrix magnesium alloy. The invention relates to the method for preparing the graphene oxide and micro-arc oxidized ceramic composite coating on the surface of the magnesium alloy.

Description

technical field [0001] The invention relates to a method for preparing a film layer on the surface of a magnesium alloy. Background technique [0002] Graphene is a new two-dimensional nanomaterial discovered in 2004. The unique electronic and physical properties of graphene have important application prospects in the fields of molecular electronics, micro-nano devices, composite materials, field emission materials, sensors, batteries and hydrogen storage materials. From graphene, people have seen the possibility of more practical use of carbon nanomaterials, so although the discovery of graphene has only been a few decades, it has aroused great research interest of scientists, and it has quickly become a material science and condensation technology. It is a research hotspot in the field of state physics, has important theoretical and experimental research value, and is expected to set off a new technical revolution of carbon nanomaterials in the 21st century. [0003] Stu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/00C25D11/30C25D5/48
Inventor 王锐仇兆忠张昱屾李月梅徐欢欢周建军
Owner HARBIN INST OF TECH
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