The corrosion behavior of tantalum and niobium in hydrobromic acid solutions

Journal Article · Fri Aug 01 00:00:00 EDT 1986 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3583057· OSTI ID:7252856

Uehara, I; Sakai, T; Ishikawa, H; Ishii, E; Nukane, M

The corrosion behavior of tantalum and niobium in hydrobromic acid solutions free from or containing bromine has been studies using electrochemical and mass loss techniques corrosion behavior as a function of temperature, HBr/sub 2/ concentration, electrode potential, and exposure time has been examined. Both metals are passivated in HBr solutions ranging in concentration up to the azeotropic composition of 47 weight percent (wt%) and temperatures as high as l24 C. The corrosion rate of tantalum in a hydrogen bubbled 47 wt% HBr solution at l24 C was less than 2 milligrams per dm/sup 2/ and day (mdd) and that of niobium at l00 C was 20 mdd. The corrosion rates tended to decrease with decreasing temperature and HBr concentration and with increasing exposure time and electrode potential. The presence of bromine reduced the corrosion rates. Bromine is a passivating agent.

• OSTI ID: 7252856
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 42:8; ISSN CORRA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
AZEOTROPE
BROMINE
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CORROSION
CORROSIVE EFFECTS
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
HALOGENS
HYDROBROMIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MASS TRANSFER
MEDIUM TEMPERATURE
METALS
NIOBIUM
NONMETALS
PASSIVATION
QUANTITY RATIO
REACTION KINETICS
TANTALUM
TEMPERATURE EFFECTS
TIME DEPENDENCE
TRANSITION ELEMENTS