Picture of a black hole

Strathclyde Open Access research that creates ripples...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of research papers by University of Strathclyde researchers, including by Strathclyde physicists involved in observing gravitational waves and black hole mergers as part of the Laser Interferometer Gravitational-Wave Observatory (LIGO) - but also other internationally significant research from the Department of Physics. Discover why Strathclyde's physics research is making ripples...

Strathprints also exposes world leading research from the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Impact angle effects on the erosion - corrosion of superlattice CrN/NbN PVD coatings

Stack, M.M. and Purandare, Y. and Hovsepian, P. (2004) Impact angle effects on the erosion - corrosion of superlattice CrN/NbN PVD coatings. Surface and Coatings Technology, 188-189. pp. 556-565. ISSN 0257-8972

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Wastage due to the combined effects of erosion and corrosion is a serious issue in a wide range of industrial environments. The extent of wastage is dependent on a range of parameters relating to properties of the particle, target and the environment. In such cases, surface engineering (through providing a protective coating) may be used to avoid the deleterious effects of both processes. In recent years, there has been an increasing interest in the potential of CrN/NbN superlattice PVD coatings to provide resistance to erosion-corrosion in such conditions. Initial studies on the effects of velocity have shown that they significantly outperform conventional coatings, although the behaviour depends on the conditions. There is however, poor understanding on the effects of many important tribological variables, such as particle size and impact angle, on the performance of such coatings. In this work, the effect of impact angle on the erosion-corrosion of a range of CrN/NbN superlattice coatings was assessed at a range of applied potentials in a carbonate/bicarbonate solution. The mechanisms of erosion-corrosion of the coatings, as a function of impact angle and applied potential, showed significant differences when these parameters were varied. Erosion-corrosion maps were constructed based on these results showing the change in mechanisms and wastage rates as a function of impact angle and applied potential. Possible reasons for the differences in erosion-corrosion regimes for coated and uncoated specimens are described in this paper.