V. E. Annamalai

Suresh Krishnamoorthy Seshadri

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Transformation-toughened cobalt-partially stabilized zirconia electrocomposite coating

Journal of Materials Science Letters

Cobalt-silicon nitride composites were produced on mild steel by contentional electrocodeposition from a sulphate bath. These deposits showed better performance than pure cobalt in friction and wear tests against a hardened steel disc under dry sliding conditions. Changes of load and sliding velocity at the interface were also found to influence the tribological performance.

Surface Engineering

Tribomechanical properties of cobalt-silicon nitride composite coatings

The corrosion characteristics of electro codeposited cobalt-silicon nitride composites in neutral sodium chloride and sulphuric acid solutions are presented. The electro composites showed greatly improved corrosion resistance over pure cobalt in nondeaerated 3.5% sodium chloride solution, but they induced significantly less galvanic corrosion on steel in the same medium. Galvanic current and dissolution current measurements showed a linear variation with the cathode-to-anode area ratio, while the galvanic potential showed a logarithmic variation with the same. Composites of cobalt-silicon nitride also showed improved passivation properties in 1 N sulphuric acid. © 1995.

Journal	Journal of Materials Science Letters
Publisher	Kluwer Academic Publishers
ISSN	02618028
Open Access	No