Passivation of titanium by molybdate Ion

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3581978· OSTI ID:6350811

Glass, R S

The passivating effect of molybdate ion on the corrosion of titanium in deaerated, boiling 1N H/sub 2/SO/sub 4/ 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/sup +6/ at a concentration as low as 3 mM is added to an H/sub 2/SO/sub 4/ solution in which Ti is actively corroding. The open cir cuit 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 TiO/sub 2/ 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.

• Research Organization: Sandia National Laboratories, Albuquerque, NM
• OSTI ID: 6350811
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 41:2; ISSN CORRA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
CORROSION PROTECTION
CORROSION RESISTANCE
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MOLYBDATES
MOLYBDENUM COMPOUNDS
OXYGEN COMPOUNDS
PASSIVATION
REFRACTORY METAL COMPOUNDS
SULFURIC ACID
TITANIUM
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS