Pretreatment method for improving TiAl-Nb alloy liquid zinc corrosion resistance performance
A tial-nb and zinc corrosion technology is applied in the field of pretreatment to improve the liquid zinc corrosion resistance of TiAl-Nb alloys.
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Embodiment 1
[0020] figure 2 is the histogram of the corrosion incubation period of the three samples. The corrosion incubation period of the blank sample, the wire-cut sample and the pretreated sample in the zinc solution were 30 days, 57 days and 87 days respectively. Compared with the two comparison samples, the corrosion incubation period of the pretreated sample was greatly improved. When the corrosion begins to occur, all three samples firstly localized corrosion at the corners, and then expanded to the center. There is only a very thin layer of low-temperature oxide film on the surface of the blank sample, and its corrosion incubation period is relatively short. The oxide film on the surface of the wire cut sample and the pretreated sample is thicker, which has a better barrier effect on the zinc liquid. image 3 is the surface morphology of the wire-cut sample, Figure 4 is the surface morphology of the sample after pretreatment. Comparing the two pictures, it can be seen that...
Embodiment 2
[0023] Figure 5 is the incubation period histogram of the three samples. The corrosion incubation period of the blank sample, the wire-cut sample and the pretreated sample in the zinc solution were 33 days, 69 days and 96 days respectively. Compared with the two comparison samples, the corrosion incubation period of the pretreated sample was greatly improved. Compared with the alloy in Example 1, the addition of Y makes the structure of the alloy greatly refined, and the material mechanics and oxidation resistance are significantly different. The difference between the corrosion incubation periods of the blank samples of the two alloys is small, but that of the pretreated samples is relatively large. The effect of pretreatment on the corrosion incubation period is more obvious.
[0024] Example 3:
Embodiment 3
[0026] Figure 6 is the incubation period histogram of the three samples. The corrosion incubation period of the blank sample, the wire cutting sample and the pretreated sample in the zinc solution were 60 days, 87 days and 102 days respectively. Compared with the two comparison samples, the corrosion incubation period of the pretreated sample was greatly improved. The composition and structure of the alloy in this example are more complex, and the plasma melting makes the material structure denser and with fewer defects, so the corrosion incubation period of the blank sample is longer than that in the previous two examples. But it can be seen that the effect of preprocessing is still very obvious.
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