Mn和V对TiAl金属间化合物在900 ℃ (Na, K)2SO4熔盐中热腐蚀行为的影响有所不同. TiAl合金中加入Mn后, 最外层的腐蚀产物为以Al2O3为主, 另有少量的TiO2的混合物; 内层是Al, Ti和Mn的混合氧化物以及Ti的硫化物. 加Mn在一定程度上减弱了TiAl合金的耐蚀性. TiAl和TiAl-Mn合金中加入V后耐蚀性明显变差, 最外层腐蚀产物以TiO2为主, 并含有少量Al2O3和微量的V2O5, 腐蚀层中的V2O5引起A2O3的酸性溶解, 因而不能形成保护性的Al2O3层, 形成的TiO2和Al2O3混合膜的黏附性差, 较易剥落.
The effect of Mn and V on hot corrosion of TiAl in (Na, K)2SO4 melt at 900 ℃ has been investigated. The results show that there is a little effect of Mn on hot-corrosion resistance and the scale structure of TiAl alloy. TiAl and TiAl-Mn alloys have a low hot-corrosion rate because the outer layer of the scale is mainly protective Al2O3. Adding V, however, could change the structure of the scale, and then increased hot corrosion rate of the TiAl and TiAl-Mn alloys by one order of magnitude. For TiAl-V and TiAl-Mn-V alloys, the scale is mainly TiO2, and minor Al2O3 and V2O5. V2O5 can induce cyclic acidic dissolution of Al2O3. As a result, the scale of the TiAl-V and TiAl-Mn-V alloys peeled off locally at the early stage of hot corrosion, and the alloys have a large hot-corrosion rate.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] |
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