Abstract
The applications of wear-resistant physically vapour deposited nitride coatings are briefly reviewed. It is shown that the coatings contain defects called pinholes which in an agressive environment lead to a rapid corrosion of the underlying less-noble substrate and flaking of the coating itself. Methods of improving the corrosion resistance methods, like chemical passivation, deposition of multilayer coatings and noble metal alloying of the coating, are discussed.
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