Abstract
The microhardness and corrosion resistance of 35–40-μm-thick vacuum–plasma coatings of Ti, Zr, Ti–TiN, or Zr–ZrN, which were applied to structural carbon steel substrates, were studied. The properties of the coatings were compared with those of a 12X18H10T-steel coating, which had been suggested as a corrosion-resistant coating. The corrosion resistance of both Ti and Zr coatings was found to be virtually unaffected by further applying a nitride surface layer. The coatings, in order of increasing corrosion properties, can be arranged in the sequence: Ti–TiN, Ti, 12X18H10T-steel, Zr, and Zr–ZrN. The question on the corrosion mechanism of the coatings was touched on.
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