Method for preparing composite nickel coating on surface of magnesium alloy micro-arc oxidation film
A micro-arc oxidation and magnesium alloy technology, applied in the field of metal surface treatment, can solve the problems of deterioration of mechanical properties of magnesium alloy parts, difficulty in obtaining uniform defect-free coating, bimetallic galvanic corrosion, etc., to improve the overall protection performance and bonding performance. , Low toxicity and environmental protection of materials, and the effect of high bonding strength
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[0035] Example 1
[0036] 1. Material preparation: After AZ91D magnesium alloy is cut, polished and polished, it is cleaned by ultrasonic in acetone solution to remove oil, and then cleaned by ultrasonic in deionized water to remove organic matter and impurities.
[0037] 2. Micro-arc oxidation: in electrolyte, sodium silicate 15g / L, sodium hydroxide 2g / L, sodium carbonate 5g / L, the rest is water, temperature is 50℃; high-voltage pulse mode is used for micro-arc oxidation, pulse The frequency is 500Hz, the current density is 2A / dm 2 , The oxidation time is 40 minutes, the thickness of the oxide film is 25μm, the oxide film is a porous ceramic membrane, the porosity is 40%, and the pore size is 2-5μm.
[0038] 3. Sealing and nickel plating treatment
[0039] 1) The configuration of the silane mixture. The silane KH-560 and TEOS are mixed and stirred at a molar ratio of n(KH560):n(TEOS)=3:1 to obtain a silane mixture.
[0040] 2) Configuration of hydrolysis catalyst. Acetic acid and ph...
Example Embodiment
[0052] Example 2
[0053] The difference from Example 1 is:
[0054] 1. Material preparation: After AZ31B magnesium alloy is cut, polished and polished, it is cleaned and degreasing by ultrasonic in anhydrous ethanol solution, and then ultrasonically cleaned in deionized water to remove organic matter and impurities.
[0055] 2. Micro-arc oxidation: In the electrolyte, sodium silicate 10g / L, sodium hydroxide 10g / L, sodium carbonate 8g / L, the rest is water, the temperature is 35℃. Micro-arc oxidation is performed by high-voltage pulse method, the pulse frequency is 800Hz, and the current density is 2A / dm 2 , The oxidation time is 60min, the oxide film thickness is 15μm, the oxide film is a porous ceramic membrane, the porosity is 35%, and the pore size is 3~5μm.
[0056] 3. Sealing and nickel plating treatment
[0057] 1) The configuration of the silane mixture. The silane KH-560 and TEOS were mixed and stirred at a molar ratio of n(KH560):n(TEOS)=3:2 to obtain a silane mixture.
[0058...
Example Embodiment
[0070] Example 3
[0071] The difference from Example 1 is:
[0072] 1. Material preparation: After ZM5 magnesium alloy is cut, polished and polished, it is cleaned by ultrasonic in organic solvent to remove oil, and then cleaned by ultrasonic in deionized water to remove organic matter and impurities.
[0073] 2. Micro-arc oxidation: 20g / L of sodium silicate, 6g / L of sodium hydroxide, 8g / L of sodium carbonate in the electrolyte, the rest is water, the temperature is 40℃; high-voltage pulse mode is used for micro-arc oxidation, pulse frequency 1000Hz, current density 3A / dm 2 The oxidation time is 50 minutes, the thickness of the oxide film is 20 μm, the oxide film is a porous ceramic film, the porosity is 50%, and the pore size is 6-10 μm.
[0074] 3. Sealing and nickel plating treatment
[0075] 1) The configuration of the silane mixture. The silane KH-560 and TEOS were mixed and stirred at a molar ratio of n(KH560):n(TEOS)=5:2 to obtain a silane mixture.
[0076] 2) Configuration of ...
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