Transport and reaction during pitting corrosion of Ni in 0. 5M NaCl. 2; Flowing fluid
- Materials Research Lab., Dept. of Chemical Engineering, Univ. of Illinois, Urbana, IL (US)
This paper reports on a finite-element model that was developed to simulate potential dependent dissolution of a two-dimensional cylindrical trench in the presence of fluid flow. The model includes multiple species in solution, reaction equilibria, and transport by convection, diffusion, and migration. Simulations were performed for parameter values that correspond to the pitting of nickel in 0.5M NaCl. It was found theoretically that, for this system. fluid flow would cause a decrease in the dissolution rate owing to potential-field effects. Also, rinsing of the cavity was predicted for high flow rates. Experimental observations were in agreement with the theoretical predictions. even though the geometry of the two systems was distinctly different. Repassivation of corrosion pits was observed experimentally at flow rates for which the dimensionless Peclet number exceeded 10{sup 3}.
- DOE Contract Number:
- FG02-91ER45439
- OSTI ID:
- 5132848
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 138:12; ISSN 0013-4651; ISSN JESOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALKALI METAL COMPOUNDS
ATOM TRANSPORT
CAVITATION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CORROSIVE EFFECTS
DISSOLUTION
ELECTROCHEMICAL CORROSION
ELEMENTS
FINITE ELEMENT METHOD
FLUID FLOW
HALIDES
HALOGEN COMPOUNDS
MATHEMATICAL MODELS
METALS
NEUTRAL-PARTICLE TRANSPORT
NICKEL
NUMERICAL SOLUTION
PITTING CORROSION
RADIATION TRANSPORT
REDOX POTENTIAL
SODIUM CHLORIDES
SODIUM COMPOUNDS
TRANSITION ELEMENTS