Corrosion Resistance of Single TiN Layers, Ti/TiN Bilayers and Ti/TiN/Ti/TiN Multilayers on Iron Under a Salt Fog Spray (Phohesion) Test: An Evaluation by XPS

Abstract

The corrosion resistance of three different TiN coatings on iron (single TiN layer, Ti/TiN bilayer and Ti/TiN/Ti/TiN multilayer) subjected to a salt (ammonium sulphate and sodium chloride) fog spray (Prohesion) test has been investigated by means of x-ray photoelectron spectroscopy (XPS). The relative intensities of the Fe 2p and O 1s signals in the XPS spectra of the corroded samples increase with their extent of degradation. The results show that the corrosion resistance of these coatings decrease in the order bilayer > multilayer > single layer. Copyright £ 1999 John Wiley & Sons Ltd.