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Corrosion behavior of nanocomposite titanium silicon nitride and binary chromium nitride coatings on steel substrates: A comparative study
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Corrosion behavior of nanocomposite titanium silicon nitride and binary chromium nitride coatings on steel substrates: A comparative study

M. Ahmed, P. Munroe, Z. Zhou, L.K.Y. Li, Z-T Jiang, W. Rickard, Z. Xie and H. Guo
Materials Research Society of Singapore
International Conference on Materials for Advanced Technologies (ICMAT) (Singapore, 26/06/2011–01/07/2011)
2011
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Abstract

Ceramic coatings have been widely used to protect metal components against corrosion damage. However, a detailed understanding of the roles of the surface chemistry and coating microstructure in controlling corrosion resistance is lacking. In this study, two types of ceramic coatings, namely TiSiN and CrN, were deposited on steel substrates by unbalanced magnetron sputtering technique. Distinct microstructure features were revealed for these coatings by a dual beam focused ion beam (FIB) microscope – TiSiN has a nanocomposite structure, while CrN consists of vertically aligned columnar grains. The corrosion resistance of these coated samples was first evaluated and compared by electrochemical tests in a 3.5 wt.% NaCl solution. Then, immersion tests were conducted in 70% HNO3 solution at room temperature for 96 hours. The chemical composition, microstructure and mechanical properties of the samples were characterised by energy dispersive X-ray spectroscopy (EDX), X-ray photo spectroscopy, FIB and nanoindentation experiments to probe the mechanism under which corrosion occurred. In addition, the deformation was introduced to these coatings by nanoindentation before immersion tests to observe the effect of mechanical damage on corrosion resistance of the coated steels.

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