zro on a magnesium alloy 2 /mgo wear-resistant film layer and preparation method thereof
A magnesium alloy and wear-resistant film technology, which is applied in the field of ZrO2/MgO wear-resistant film and its preparation, can solve the problems of poor adhesion between the micro-arc oxidation film and the substrate, and achieves the improvement of easy cracking, avoidance of microporous loosening, The effect of promoting surface densification
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Embodiment 1
[0034] 2g of ammonium bifluoride, 4g of sodium dihydrogen phosphate, 3g of potassium fluorozirconate and 2.5g of potassium hydroxide were added to 1L of deionized water to obtain an electrolyte, and the AZ91 magnesium alloy was placed in the electrolyte for micro-arc oxidation treatment;
[0035] The micro-arc oxidation process is:
[0036] The micro-arc oxidation voltage is cyclically pressurized from 180V to 400V. Each time the film surface is close to the arc-extinguishing state, the pressure is 5-10V. After the arc is started, the reaction lasts for 15min. After that, the voltage is reduced to zero and the power is turned off;
[0037] After the micro-arc oxidation is completed, the AZ91 magnesium alloy is rapidly cooled in the cooling liquid, and ZrO is formed in situ on the magnesium alloy after cooling. 2 / MgO wear-resistant film.
[0038] see figure 2 , figure 2 It is the SEM image of the film layer of Example 1, wherein (a) is the SEM image of the surface of the ...
Embodiment 2
[0040] Add 2g ammonium hydrogen fluoride, 1g potassium fluorozirconate, 4g sodium dihydrogen phosphate and 2.5g potassium hydroxide into 1L deionized water to obtain an electrolyte solution, place the magnesium alloy in the electrolyte solution for micro-arc oxidation treatment, and then in the cooling solution Rapid cooling to generate ZrO in situ on magnesium alloys 2 / MgO wear-resistant film.
[0041] The micro-arc oxidation process is as follows: the micro-arc oxidation voltage is cyclically pressurized from 180V to 450V, and each time the film surface is close to the arc-extinguishing state, the pressure is 5-10V, and the reaction lasts for 25 minutes after the arc is started. After that, the voltage is reduced to zero, and the power is turned off. ;
Embodiment 3
[0043] 2g of ammonium bifluoride, 5g of potassium fluorozirconate, 4g of sodium dihydrogen phosphate and 2.5g of potassium hydroxide were added to 1L of deionized water to obtain an electrolyte, and the magnesium alloy was placed in the electrolyte for micro-arc oxidation treatment, followed by rapid cooling, In situ generation of ZrO on magnesium alloys 2 / MgO wear-resistant film.
[0044] The micro-arc oxidation process is as follows: the micro-arc oxidation voltage is 180V and cyclically pressurized to 400V. Each time the film surface is close to the arc extinguishing state, the pressure is 5-10V.
[0045] see Figure 5 , Figure 5 It is the SEM image of the section of the membrane layer in Example 3. It can be seen from the figure that the higher concentration of potassium fluorozirconate makes the microporous structure of the prepared zirconia composite ceramic membrane layer larger, with a through-hole structure, and the membrane The poor base binding force indicates ...
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