HOT CORROSION BEHAVIOR OF ARC-ION PLATING Ti-Al-Cr(Si, Y) COATINGS ON Ti60 ALLOY
YAN Wei1; SUN Fengjiu1; WANG Qingjiang2; LIU Jianrong2; CHEN Zhiyong2; LI Shaoqiang2
1.College of Sciences; Northeastern University; Shenyang 110004
2.Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
Cite this article:
YAN Wei SUN Fengjiu WANG Qingjiang LIU Jianrong CHEN Zhiyong LI Shaoqiang. HOT CORROSION BEHAVIOR OF ARC-ION PLATING Ti-Al-Cr(Si, Y) COATINGS ON Ti60 ALLOY. Acta Metall Sin, 2009, 45(10): 1171-1178.
High–temperature titanium alloys intended for aero engine compressor applications suffer from high–temperature oxidation and environmental corrosion, which prohibit their long–term service at temperatures above 600 ℃. In an attempt to improve the oxidation resistance and corrosion resistance, Ti–48%Al–12%Cr (0.2%Si, 0.1%Y, atomic fraction) protective coatings were plated on the substrate of alloy Ti60 by arc ion plating (AIP) method. The corrosion behavior of the bare alloys and the protective coatings in Na2SO4 and 75%Na2SO4+ 25%K2SO4 (mass fraction) in air was investigated by XRD, SEM and EDS. The results indicate that Ti60 alloy shows a poor corrosion resistance in the hot corrosion process at 800 and 850 ℃due to corrosion product scales spalling. Ti–Al–Cr(Si, Y) coated specimens, however exhibited good hot corrosion resistance at 800 and 850 ℃ in sulfate. Corrosion in 75%Na2SO4+25%K2SO4 is more severe than that in Na2SO4. Ti60 with Ti–Al–Cr–Si coating or Ti–Al–Cr–Si–Y coating has better hot corrosion resistance than that with Ti–Al–Cr coating.
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