表面涂Na2SO4盐膜的改性Ti3Al基合金在910和950℃空气中的热腐蚀行为.pdfVIP

Trans. Nonferrous Met. Soc. China 27(2017) 954−961 Hot corrosion of modified Ti Al-based alloy coated with 3 thin Na SO film at 910 and 950 °C in air 2 4 1 1,2 1 1 1 Yu-hai QIAN , Xi-chao LI , Mei-shuan LI , Jing-jun XU , Bin LU 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2. University of Chinese Academy of Sciences, Beijing 100039, China Received 11 January 2016; accepted 10 October 2016 Abstract: The hot corrosion behaviour of a modified Ti Al-based alloy under thin Na SO deposit film was investigated at 910 and 3 2 4 950 °C in air. The corrosion product was identified by XRD and its morphologies on the surface and cross-section were observed by SEM. The alloy suffered from considerable hot corrosion attack. The mass gain versus time curves obtained by TGA exhibited two regions of different kinetics. The whole corroded layer consisted of loose and porous mixture oxides of TiO , Nb O and Al O . 2 2 5 2 3 Numerous small nodules of corrosion product were observed . An illustrative schematic was established to describe t