Fundamental studies of passivity and passivity breakdown

Technical Report · Mon Apr 20 00:00:00 EDT 1992

DOI:https://doi.org/10.2172/6975641· OSTI ID:6975641

Macdonald, D D

Effects of minor alloying elements on passivity breakdown and of photo effects on the properties of passive films are under study, and electrochemical and photoelectrochemical techniques are being used to explore transport and kinetic properties of vacancies and charge carriers in films and at metal/film and film/solution interfaces. Point defect and solute/vacancy interaction models are being developed to account for distributions in critical voltage and induction time for passivity breakdown by incorporating thermodynamics of absorption of halide ions into surface oxygen vacancies, by invoking different mechanisms for cation vacancy generation at film/solution interface, by extending the models to passive films on metal substrates having variable cation oxidation states, and by deriving rate laws for growth of passive films in response to an imposed voltage perturbation.

• Research Organization: Pennsylvania State Univ., University Park, PA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-91ER45461
• OSTI ID: 6975641
• Report Number(s): DOE/ER/45461-1; ON: DE93002747
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTROCHEMISTRY
FILMS
PASSIVITY
ANIONS
BREAKDOWN
CATIONS
HALIDES
INTERFACES
METALS
NICKEL
NICKEL OXIDES
SOLUTIONS
SURFACES
VACANCIES
CHALCOGENIDES
CHARGED PARTICLES
CHEMISTRY
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISPERSIONS
ELEMENTS
HALOGEN COMPOUNDS
IONS
MIXTURES
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400400* - Electrochemistry