Experimental and theoretical study for hot corrosion behavior of network structured TiBw/TA15 composite with NaCl film at 800?℃

作者：Kang Qingxin; Wang Guofeng; Liu Yongkang; Chen Yuqing; Luo Shuyi

来源：Corrosion Science, 2022, 206: 110540.

DOI：10.1016/J.CORSCI.2022.110540

• A. metal matrix composites
• A. titanium
• B. modeling studies
• C. hot corrosion

The hot corrosion behavior of network structured TiBw/TA15 composite with NaCl film at 800?℃ was investigated. After the 100?h test, the mass change was 50.13?mg?cm\u003csup\u003e?2\u003c/sup\u003e and 400?μm scale with obvious pores and cracks formed on the substrate, which mainly composed by TiO2 and Al2O3 with a few Na2TiO3, NaAlO2 and Ti/Al chlorides. The adsorption of Cl atom on α-Ti (0001) and α-Ti (0001)-Al surfaces was studied by density functional theory. Chlorination-oxidation circulation was the main reason of the severe hot corrosion. Cracks and holes were mainly caused by the escape of high vapor pressure Ti/Al chlorides and thermal stress resulting from the rapid growth of the hot corrosion scale. In addition, approaches for improving the hot corrosion resistance were discussed.