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采用电化学方法并结合各种物相分析技术研究了Ti_3Al金属间化合物在熔融(Na,K)_2SO_4-NaCl中的热腐蚀行为及渗铝涂层对其耐蚀性能的影响。结果表明,Ti_3Al耐热腐蚀性能较差。形成了外层为TiO_2,中间层为富铝的TiO_2-Al_2O_3复合层,内层为富铌的Nb_2O_5-TiO_2-Al_2O_3层的三层结构。渗铝涂层能在合金表面形成Al_2O_3氧化膜而明显改善Ti_3Al的耐蚀性能。
The effects of aluminized coating on the corrosion resistance of Ti_3Al intermetallic compound in molten (Na, K) _2SO_4-NaCl were studied by electrochemical method and various phase analysis techniques. The results show that the Ti_3Al hot corrosion resistance is poor. A three-layer structure of Nb 2 O 5 -TiO 2 -Al 2 O 3 layer with niobium is formed in the inner layer of TiO 2 -Al 2 O 3 composite layer with outer layer of TiO 2 and intermediate layer of aluminum-rich. Aluminized coating can form Al_2O_3 oxide film on the surface of the alloy and obviously improve the corrosion resistance of Ti_3Al.