The passivating effect of molybdate ion on the corrosion of titanium in deaerated, boiling 1N H2SO4 has been explored. In this medium, in the absence of molybdate ion, titanium rapidly corrodes. An immediate passivation process for Ti is observed when Mo+6 at a concentration as low as 3 mM is added to an H2SO4 solution in which Ti is actively corroding. The open circuit potential attained for Ti in molybdate solution is shown to be controlled by redox processes. Through a combination of surface analytical and electrochemical data, it is shown that upon immersion of Ti in acidic molybdate solution, the native TiO2 oxide is replaced by a salt film containing Mo. This film is adherent when a passivated electrode is transferred to a molybdate-free solution, and it provides a corrosion resistant barrier.
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1 February 1985
Research Article|
February 01 1985
Passivation of Titanium by Molybdate Ion Available to Purchase
Robert S. Glass
Robert S. Glass
fn1-1_3581978
*Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185.
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Present address: Lawrence Livermore National Laboratory, P.O. Box 808, L-369, Livermore, CA 94550.
Online ISSN: 1938-159X
Print ISSN: 0010-9312
National Association of Corrosion Engineers
1985
CORROSION (1985) 41 (2): 89–93.
Citation
Robert S. Glass; Passivation of Titanium by Molybdate Ion. CORROSION 1 February 1985; 41 (2): 89–93. https://doi.org/10.5006/1.3581978
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