Abstract
In order to clarify the crack morphology of TiN and Ti films on stainless steel sheets, it was undertaken to do high-speed plasma coating on wide and large materials under a high evaporation rate of 5 μm/min and high ionization of 75%.After the bulge press-forming, there were no apparent peeling of the TiN and Ti coated layers and no obvious difference in surface integrity at the central and corner areas.In the scanning electron microscopic observation, the TiN films at the central area showed the comparatively sharp straight cracks characteristic of ceramics. In contrast, the Ti films cracked in the slightly elongated manner characteristic of metal, with scribing on the surface due to the soft Ti film.In the cross-sectional observation of TiN films, TiN films cracked perpendicular to the steel surface. In contrast, the Ti films opened at the surface and the steel sheet was masked in place by the Ti films.In the corrosion test of these films, the TiN films were more susceptible to corrosion than the Ti films, presumably because the cavities created by internal peeling in TiN films exposed a greater area of steel and tended to trap corrosive substances.
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