Abstract
The corrosion behaviour of vacuum-evaporated titanium, ion-plated titanium, ion-plated TiN and yttrium-modified TiN coatings was studied in three corrosive media. Ion-plated titanium coatings exhibited better corrosion resistance than vacuum-evaporated coatings, which may be related to the effect of negative bias which enabled the former to become more compact and less rough. There is no distinguishable difference in the chemical composition and phase constituents of the top surface between TiN and Ti(Y)N coatings, but study of their pole figures revealed that there is a strong (110) texture for TiN coatings, and (112) texture for Ti(Y)N coatings. The latter lattice plane is closer to TiN(111) with the highest degree of microcompactness and may be responsible for the better corrosion resistance of Ti(Y)N coatings.
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