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Corrosion characteristics of cobalt-silicon nitride electro composites in various corrosive environments
Amita Iyer, Suresh Krishnamoorthy Seshadri
Published in
Volume: 40
Issue: 3
Pages: 189 - 196
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.
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JournalMaterials Chemistry & Physics
Open AccessNo