Abstract
In this paper, oxide coatings were prepared on Ti-48Al-2Cr-2 V alloy in 50 vol% glycerin solution by cathodic plasma electrolytic oxidation (CPEO) at 300 V–340 V for 5 min. The morphologies, microstructure and phase components of CPEO coatings were analyzed. Air acoustical and sample vibrational signals during the CPEO process were collected and their frequency spectra were analyzed. The electron temperature and electron concentration in plasma discharge envelope was calculated on the basis of optical emission spectroscopy (OES). The thickness and microhardness of oxide coating on γ-TiAl alloy at 340 V reached to 26 μm and 765 HV. The surface energy of CPEO coatings reduced to 24–28 mJ/m2 from 32.56 mJ/m2 of bare γ-TiAl alloy. The CPEO coatings were composed of Al2TiO5, anatase, rutile and α-Al2O3 phases. The average electron temperature in plasma discharge zone was about 5500 K, which greatly enhanced the growth of CPEO coating on γ-TiAl alloy. Furthermore, the frequency spectra of air acoustic and sample vibrational signals were related to the voltage-time and current-time evolutions in the CPEO process. The sample vibration is more sensitive than the air acoustic in diagnosing the spark discharge of CPEO process on the γ-TiAl alloy cathode.
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