Effects of titanium-based raw materials on electrochemical behavior of Ti(C,N)-based cermets
Source abstract
Abstract
The electrochemical behavior of Ti(C,N)-based cermets with two different kinds of titanium-based raw materials, i.e. solid solution type TiC 0.7N 0.3 and single interstitial phase type TiC and TiN, was investigated in H 2SO 4 (pH = 1) and NaOH (pH = 13) solutions at 25 °C. Potentiodynamic polarization, electrochemical impedance spectroscopy and surface analytical techniques were used for the investigation. The results show that the cermet prepared from TiC 0.7N 0.3 -based raw material exhibits higher corrosion resistance in the two solutions due to the differences in the chemical composition of the binder phase and hard phase and in the homogeneity of the microstructure. Both the cermets exhibit substantially higher corrosion resistance in NaOH than in H 2SO 4 . Based on the X-ray photoelectron spectroscope analysis results, the corrosion mechanism was discussed in details.
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