Corrosion of Cobalt-Molybdenum Alloys in Chloride Solutions

• Published in: Materials science (New York, N.Y.) Vol. 54; no. 4; pp. 512 - 518
• Main Authors: Shtefan, V. V., Smyrnov, O. O., Bezhenko, A. O., Epifanova, A. S., Kanunnikova, N. O., Metenkanych, M. M., Knyazev, S. A.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.01.2019; Springer; Springer Nature B.V
• Subjects: Alloys; Aqueous solutions; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cobalt; Cobalt base alloys; Corrosion (Chemistry); Corrosion resistance; Corrosion resistant alloys; Equivalent circuits; Halides; Materials Science; Metals (Materials); Molybdenum; Molybdenum alloys; Molybdenum base alloys; Morphology; Petrochemicals industry; Protective coatings; Solid Mechanics; Specialty metals industry; Spectroscopy; Steel corrosion; Structural Materials; Technical institutes; impedance; alloy; cobalt; coating; molybdenum
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-019-00225-y

We study the protective properties of coatings made of Co–Mo alloy in 3% NaCl and 5% HCl aqueous solutions containing 0, 10, 25, 50, 75, and 85 wt.% Mo. The method of impedance spectroscopy is used to construct the equivalent circuit and determine its parameters. The accumulated results are used to make conclusions concerning the corrosion resistance of the alloy in chloride-containing media. We obtain the data on the elemental composition of the investigated coatings and study their surface morphologies. It is shown that the Co 7 Mo 6 compound is predominant in the Co–Mo alloy.