Magnesium alloy implant material with nanocrystalline zinc coating on surface and preparation method thereof
A technology for implant materials and magnesium alloys, which is applied in the field of magnesium alloy implant materials with nanocrystalline zinc coating on the surface and its preparation, can solve the problems of corrosion resistance that have not been reported yet, and achieve moderate electrical conductivity and lower corrosion potential , Improve the effect of corrosion resistance
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Embodiment 1
[0043] Nano zinc electroplating process concrete operation steps of the present invention are as follows:
[0044] 1. The magnesium alloy to be plated with a size of 2.5cm×2.5cm was ultrasonically cleaned in acetone solution for 8 minutes, and then rinsed with deionized water. The surface morphology of the magnesium alloy after pretreatment was as follows: figure 1 as shown in (a);
[0045] 2. Use oxalic acid (15g / L) to derust the substrate for 1min at room temperature, and then rinse with deionized water;
[0046] 3. Prepare zinc pre-plating solution according to zinc sulfate 35g / L, sodium pyrophosphate 145g / L and sodium fluoride 10g / L, the solvent is deionized water, and the pH is adjusted to 9-11 by sodium hydroxide;
[0047] The zinc pre-plating solution contains zinc sulfate, sodium pyrophosphate and sodium fluoride, which can effectively inhibit the effect of magnesium on Zn 2+ The replacement effect of the magnesium alloy forms a layer of zinc transition layer with a ...
Embodiment 2
[0055] In steps 5 and 6 of this embodiment, the first electroplating and the second electroplating adopt high-frequency forward pulse current instead of constant current, and the specific process parameters are: the power-on time of the first electroplating and the second electroplating is 0.2ms, The power-off time is 0.8ms, the pulse frequency is 1000Hz, the pulse duty cycle is 20%, and the average current density is 3A / dm 2 , the first electroplating time is 10min, and the second electroplating time is 60min; other steps and conditions refer to Example 1. The surface morphology of the prepared nanocrystalline zinc coating, such as Figure 4 As shown in b and e, compared to DC electrodeposited nanocrystalline zinc coating ( Figure 4 The crystal grains in a and d) are smaller and the surface is smoother, which is more conducive to resisting the corrosion of the body fluid environment.
Embodiment 3
[0057] In steps 5 and 6 of this embodiment, the first electroplating and the second electroplating adopt high-frequency bidirectional pulse current instead of constant current. The power time is 0.8ms, the pulse frequency is 1000Hz, the pulse duty cycle is 20%, and the forward average current density is 3A / dm 2 , the reverse average current density is 0.3A / dm 2 , the positive pulse duty cycle is 100ms, the reverse pulse duty cycle is 10ms, the first electroplating time is 10min, and the second electroplating time is 60min; other steps and conditions refer to embodiment 1. The surface morphology of the prepared nanocrystalline zinc coating, such as Figure 4 As shown in c and f, compared with the high-frequency positive pulse electrodeposited nanocrystalline zinc coating ( Figure 4 In b and e), the grain size is not further refined, but its surface is smoother, which is also conducive to improving the resistance to body fluid corrosion. According to the demand for the servic...
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Abstract
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