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A method for anodic oxidation of titanium-aluminum alloy in ethylene glycol solution adding ionic liquid
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An ionic liquid and titanium-aluminum alloy technology is applied in the field of titanium-aluminum alloy anodic oxidation and titanium-aluminum alloy high-temperature oxidation resistance, and achieves the effects of convenient operation, high efficiency and simple preparation process
Inactive Publication Date: 2017-05-10
ZHEJIANG UNIV OF TECH +1
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Ethylene glycol solution is often used as a solvent in electrochemical anodization. However, there is no such report on the use of ethylene glycol to anodize titanium-aluminum alloy to improve its high-temperature oxidation resistance.
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Embodiment 1
[0027] The polished and cleaned titanium-aluminum alloy sample (Ti-50Al) was used as the anode, and the graphite electrode was used as the counter electrode. The ethylene glycol solution of 1-butyl-3-methylimidazolium hexafluorophosphate, the voltage is set to 15V, the temperature is controlled at 25°C by heating in a water bath, and the sample is taken out after anodizing for 2 hours and ultrasonically cleaned with absolute ethanol for 3 minutes, hot air blow dry.
[0028] The weight gain per unit area after constant temperature oxidation at 1000°C for 100 hours was used to evaluate its high temperature oxidation resistance. The specific results are shown in Table 1.
[0029] Table 1 Experimental results of non-anodized and anodized samples
[0030] sample Weight gain mg / cm 2
Unanodized sample 73.86 Anodized sample 0.44
[0031] The kinetic curves of the weight gain per unit area versus time when the non-anodized sample and the anodized sampl...
Embodiment 2
[0035] The specific steps are the same as in Example 1, except that the anodic oxidation electrolyte used is 1-hexyl-2,3-dimethylimidazolium hexafluorophosphate and N-octylpyridinium bromide containing 1.5% volume fraction respectively. , N-butylpyridinium bromide, tributylmethylammonium chloride, N-butyl-N-methylpyrrolidinium bromide, N-ethylpyridine tetrafluoroborate in ethylene glycol solution, voltage Set at 15V, at 25°C, take out the sample after anodizing for 2h, ultrasonically clean it with absolute ethanol for 3min, and dry it with hot air. The high-temperature oxidation resistance evaluation is the same as in Example 1, and the experimental results are listed in Table 2.
[0036] Table 2 Experimental results of different ionic liquids
[0037] ionic liquid Weight gain mg / cm 2
Embodiment 3
[0039] The specific steps are the same as in Example 1, except that water is added to the anodic oxidation electrolyte, and the volume fractions are respectively 1, 3, 8, 10, and 15%. After 2 hours of anodic oxidation, the sample is taken out and ultrasonically cleaned with absolute ethanol for 3 minutes. Drying with hot air, the high temperature oxidation resistance evaluation is the same as in Example 1, and the experimental results are listed in Table 3.
[0040] Table 3 Experimental results of different water contents
[0041] water content Weight gain mg / cm 2
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Abstract
The invention discloses a method for oxidizing the anode of a titanium-aluminum alloy in an ion liquid-added ethylene glycol solution. According to the method, a polished and washed titanium-aluminum alloy sample is used as an anode, graphite or a platinum sheet is used as a counter electrode, and the anode is oxidized in an electrolyte by adopting a constant-pressure mode, wherein the electrolyte is an ethylene glycol solution containing 0.5-5 percent by volume of ion liquid or an ethylene glycol solution containing 0.5-5 percent by volume of ion liquid and 0-15 mass percent of water; the distance between the anode and the counter electrode is controlled between 1 and 10cm, the oxidizing voltage is 2-60V, the temperature of the electrolyte is 5-50 DEG C, and the oxidizing time is 0.5-15 hours; the oxidized sample is taken out after the anode is oxidized, is washed and dried to prepare titanium-aluminum alloy treated by anode oxidization. A uniform oxidative film is prepared on the surface of the titanium-aluminum alloy, and the titanium-aluminum alloy has a good binding force with a substrate; the preparation process is simple, low in cost, convenient to operate, high in efficiency and easy to implement. The titanium-aluminum alloy has excellent oxidation resistance under 1000 DEG C high-temperature oxidation.
Description
technical field [0001] The invention belongs to the field of high-temperature oxidation resistance of metal materials, and in particular relates to a method for anodic oxidation of titanium-aluminum alloy in ethylene glycol solution added with ionic liquid, which is used for high-temperature oxidation resistance of titanium-aluminum alloy. [0002] technical background [0003] Titanium-aluminum alloy has the advantages of low density, high specific strength, high elastic modulus, and good high-temperature creep resistance. It is a high-temperature material with great application prospects. part. However, the actual use temperature of titanium-aluminum alloy is limited to 750-800°C. At higher temperatures, titanium and aluminum have similar affinity with oxygen, and TiO is formed on the surface of the alloy. 2 and Al 2 o 3 In the mixed layer, the growth rate of the oxide film is very fast, and it is easy to peel off. [0004] In order to overcome the above problems, schol...
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