A kind of magnesium alloy micro-arc oxidation solution formula and its application method

A technology of micro-arc oxidation and magnesium alloy, applied in the direction of anodic oxidation, can solve the problem of unfavorable corrosion resistance of oxide layer, and achieve the effect of improving micro-arc discharge characteristics, high corrosion resistance level and fast growth rate

Inactive Publication Date: 2015-12-23
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrolyte formula also contains a large amount of phosphate, which is detrimental to the local corrosion resistance of the oxide layer.

Method used

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  • A kind of magnesium alloy micro-arc oxidation solution formula and its application method
  • A kind of magnesium alloy micro-arc oxidation solution formula and its application method
  • A kind of magnesium alloy micro-arc oxidation solution formula and its application method

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Experimental program
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Effect test

Embodiment 1

[0020] figure 1 In the specific embodiment of the present invention, the formula of the micro-arc oxidation solution, the arc starting voltage, and the relationship diagram of the thickness of the corrosion-resistant layer; figure 2 It is the scanning electron microscope topography figure of the magnesium alloy cross section after micro-arc oxidation in the specific embodiment of the present invention; image 3 In the specific embodiment of the present invention, the scanning electron microscope topography figure of the magnesium alloy surface after micro-arc oxidation; Table 1 is in the specific embodiment of the present invention, the relationship between the formula of the micro-arc oxidation solution, the arc starting voltage, the current density, and the thickness of the corrosion-resistant layer surface.

[0021]

[0022]

[0023] As shown in Table 1, according to the formulas of A0-A7, various solutes or their hydrates of different qualities were added to deioni...

Embodiment 2

[0025] Table 2 is a relationship table of micro-arc oxidation parameters, corrosion-resistant layer thickness and corrosion-resistant grade in the specific embodiment of the present invention.

[0026]

[0027]

[0028] Using the A3 formula in Table 1 (i.e. 3g / LKOH, 10g / LNa 2 SiO 3 10H 2 O, 3g / LNa 3 AlO 3 , 3g / LNaF, 3ml / L triethanolamine and 0.5gNa 2 B 4 o 7 ), the magnesium alloy was cleaned according to the method in Example 1, the temperature of the micro-arc oxidation solution was controlled to be lower than 60°C, the power pulse frequency was 200Hz, and the duty cycle was 20%. , 380V and 410V for micro-arc oxidation for 15 minutes, and the thicknesses of the corrosion-resistant layers obtained are 6 μm, 12 μm, 15 μm, 18 μm and 21 μm respectively; using the YWX / LX-120 salt spray test chamber produced by Shanghai Luxuan Instrument and Equipment Factory, According to GB / T10125-1997 Medium Salt Spray Test Standard (NSS), the corrosion resistance of the micro-arc ...

Embodiment 3

[0030] Using the formula A3 in Table 1, clean the magnesium alloy according to the method in Example 1, the temperature of the micro-arc oxidation solution is lower than 60 ° C, the electrode settings are the same as in Example 1, the frequency of use is 200 Hz, the voltage is 350 V, and the duty cycle is 5%, 10%, 20%, 30%, 40% and 50% of the pulse power supply were subjected to micro-arc oxidation for 15 minutes, and the thicknesses of the corrosion-resistant layers obtained were 7 μm, 11 μm, 13 μm, 16 μm, 19 μm and 21 μm; according to Example 2 The methods used to test and evaluate the corrosion resistance grades of the corrosion-resistant layer are 8, 8, 8, 8, 8 and 7 (as shown in schemes B6-B11 in Table 2).

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Abstract

The invention relates to a magnesium alloy micro-arc oxidation solution for carrying out micro-arc oxidation on a magnesium alloy to form a corrosion resistance layer on the surface of the magnesium alloy. The magnesium alloy micro-arc oxidation solution is characterized in that 1 L of the magnesium alloy micro-arc oxidation solution contains 1-9 g of caustic alkali, 2-12 g of a silicate, 1-9 g of an aluminate, 1-9 g of a fluoride, 0.3-1 g of a borate, and 2-6 mL of triethanolamine, wherein a solvent of the solution is water. The method for forming a corrosion resistance layer on the surface of a magnesium alloy by using the magnesium alloy micro-arc oxidation solution is characterized by comprising the following steps: preparing a magnesium alloy micro-arc oxidation solution, adding a certain mass of caustic alkali, a silicate, an aluminate, a fluoride, a borate and triethanolamine or hydrates of the compounds to water, carrying out stirring dissolving, adding water to achieve a certain volume, carrying out degreasing and washing on a magnesium alloy, placing the magnesium alloy in the micro-arc oxidation solution, carrying out micro-arc oxidation by adopting direct current pulse current, washing the magnesium alloy, and drying.

Description

technical field [0001] The invention relates to a formula of a magnesium alloy micro-arc oxidation solution and a use method thereof, which are used for micro-arc oxidation of a magnesium alloy to form a corrosion-resistant layer on the surface thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, good processing welding and damping performance, stable size, low price, and easy recycling. It has broad application prospects and is known as "the green engineering material with the most development potential and promise in the 21st century". However, the chemical activity of magnesium alloys is very high, and they are prone to corrosion when used in various environments, which hinders the application of magnesium alloys to a large extent. [0003] The commonly used methods to improve the corrosion resistance of magnesium alloys mainly include: organic layer or organic coating, metal coating, alloying or surface alloyi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
Inventor 马凤仓刘平杨丽红李伟刘新宽陈小红何代华
Owner UNIV OF SHANGHAI FOR SCI & TECH
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