Magnetic composite oxide ceramic membrane with self-hole-sealing structure and preparation method
A composite oxide and ceramic membrane technology, which is applied in anodic oxidation, electrolytic inorganic material coating, coating, etc., can solve the problems of PEO ceramic membrane with many pores, poor mechanical properties, and poor corrosion resistance, and achieve good protection performance, Excellent magnetic mechanical properties and corrosion resistance
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Embodiment 1
[0023] (1) AZ31 magnesium alloy substrate pretreatment: use 400#, 1000#, 2000#, 4000# sandpaper to polish step by step until smooth, rinse with dilute nitric acid, and then use absolute ethanol and distilled water for ultrasonic cleaning.
[0024] (2) Preparation of electrolyte solution: use 12 g / L sodium silicate, 4 g / L potassium hydroxide and 0.8 g / L potassium ferrocyanide as the electrolyte, and deionized water as the solvent to prepare a strong alkaline composite electrolyte solution .
[0025] (3) Plasma electrolytic oxidation treatment: connect the substrate in step (1) to the anode of the DC power supply, and use the stainless steel sheet as the cathode (the distance between the cathode and anode is 3 cm), soak in the electrolyte solution in step (2) Plasma electrolytic oxidation treatment. Using the program boost mode, every 20V increase is maintained for 5 s, the terminal voltage is set to 320 V, and the hold time is 15min. A magnetic composite oxide ceramic film wit...
Embodiment 2
[0028] (1) AZ91 magnesium alloy substrate pretreatment: use 400#, 1000#, 2000#, 4000# sandpaper to polish step by step until smooth, rinse with dilute nitric acid, and then use absolute ethanol and distilled water for ultrasonic cleaning.
[0029] (2) Preparation of electrolyte solution: 8 g / L sodium silicate, 2 g / L potassium hydroxide and 0.4 g / L potassium ferricyanide were used as the electrolyte, and deionized water was used as the solvent to prepare a strong alkaline composite electrolyte solution.
[0030] (3) Plasma electrolytic oxidation treatment: connect the substrate in step (1) to the anode of the DC power supply, and use the stainless steel sheet as the cathode (the distance between the cathode and anode is 3 cm), soak in the electrolyte solution in step (2) Plasma electrolytic oxidation treatment. Using the program boost mode, every 20V increase is maintained for 30s, the terminal voltage is set to 360 V, and the hold time is 20min, a magnetic composite oxide cera...
Embodiment 3
[0033] (1) AZ31 magnesium alloy substrate pretreatment: use 400#, 1000#, 2000#, 4000# sandpaper to polish step by step until smooth, rinse with dilute nitric acid, and then use absolute ethanol and distilled water for ultrasonic cleaning.
[0034] (2) Preparation of electrolyte solution: 14 g / L sodium silicate, 6 g / L potassium hydroxide and 1 g / L potassium ferricyanide were used as the electrolyte, and deionized water was used as the solvent to prepare a strong alkaline composite electrolyte solution.
[0035] (3) Plasma electrolytic oxidation treatment: connect the substrate in step (1) to the anode of the DC power supply, and use the stainless steel sheet as the cathode (the distance between the cathode and anode is 3 cm), soak in the electrolyte solution in step (2) Plasma electrolytic oxidation treatment. Using the program boost mode, every 20V increase is maintained for 10s, the terminal voltage is set to 280V, and the hold time is 5min, a magnetic composite oxide ceramic...
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