Transport and reaction during pitting corrosion of Ni in 0. 5M NaCl; Stagnant fluid
- Materials Research Lab., Dept. of Chemical Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL (US)
This paper reports on a two-dimensional model of a corrosion pit, developed with use of a finite-element method which accounted for multiple species in solution, reaction equilibria, migration, and surface kinetics. The model was used to simulate the dissolution of a hemispherical corrosion pit on nickel in 0.5M NaCl. Concentration profiles showed significant enrichment of ions inside the pit. Concentration gradients, however, extended well beyond the mouth of the cavity, indicating the importance of transport resistance outside the cavity. Pitting corrosion of nickel in chloride solution was also investigated experimentally be forming single corrosion pits under potentiostatic conditions. The dissolution current from single pits was found to be potential dependent. Current densities, measured experimentally in the range of 150-250 mV SCE, were in good agreement with values predicted theoretically with use of the mathematical model. Local dissolution rates calculated along the pit surface were also consistent with the shape evolution of pits observed experimentally.
- DOE Contract Number:
- FG02-91ER45439
- OSTI ID:
- 5285602
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 138:9; ISSN JESOA; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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ALKALI METAL COMPOUNDS
CHARGE TRANSPORT
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CORROSIVE EFFECTS
CURRENT DENSITY
DATA
DISSOLUTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EQUILIBRIUM
EXPERIMENTAL DATA
FINITE ELEMENT METHOD
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IONIC CONDUCTIVITY
KINETICS
MATHEMATICAL MODELS
METALS
NICKEL
NUMERICAL DATA
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
PITTING CORROSION
REACTION KINETICS
SODIUM CHLORIDES
SODIUM COMPOUNDS
TRANSITION ELEMENTS
TWO-DIMENSIONAL CALCULATIONS