MOLTEN SULEATE INDUCED HOT CORROSION OF TITANIUM ALUMINIDES

J Chin Soc Corr Pro

1994, Vol. 14

Issue (4): 265-270 DOI:

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MOLTEN SULEATE INDUCED HOT CORROSION OF TITANIUM ALUMINIDES

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Abstract Hot corrosion of Ti3Al, Ti3Al-Nb and TiAl intermetallic compounds in the plesence of a (Na,K)2SO4salt film at 900 and 950 ℃ in air was studied.The experimental results indicate that Ti3AI, Ti3Al-Nb and TiAl alloys suffer from severe hot corrosion. A single protective A12O3 barrier layer doest form on the alloy surface.The electrochemical mechanism is responsible for the hot corrosion,and the formation of sulfides at the alloy/scale interface may accelerate the anodic process.The addition of Nb to Ti3Al results in a significant improvement of hot corrosion resistance of the material.The corrosion resistance of TiAl is found to be superior to that of Ti3AI base alloys.

Key words: Titanium aluminides; Intermetallic compounds; Hot corrosion

Received: 25 August 1994

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Zeng Chaoliu; Zhang Jianqing;Wu Weitao(Corrosion Science Laboratory;Institute of Corrosion and Protection of Metals;Chinese Academy of Science) Li Dong(Institute of Metal Research;Chinese Academy of Sciences). MOLTEN SULEATE INDUCED HOT CORROSION OF TITANIUM ALUMINIDES. J Chin Soc Corr Pro, 1994, 14(4): 265-270.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1994/V14/I4/265

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