Electrochemical analysis of pitting corrosion behavior of 316L stainless steel
The pitting behavior of 316L stainless has been studied by pitting potential measurements using a potentiodynamic test method. The effects of chloride ion concentration, pH, sulfate ion concentration, and temperature of the electrolyte on pit initiation in 316 stainless steel have been determined. The effects of chloride ion concentration and pH were interpreted qualitatively using a Langmuir isotherm and electrosorption model. The critical concentration of sulfate ion at various temperatures required to shift the pitting potential in the noble direction, was determined. The empirical equation for the concentration of sulfate ion versus temperature was found to be log (Na/sub 2/SO/sub 4/) = 0.01T - 0.35. A potentiostat was used to determine the kinetics of pit initiation. The pitting induction time was found to be dependent on the oxide film thickness. The apparent activation energy for pit initiation was found to be 10.2 kcal/mol, which supports the mechanism of single ion transport through the film as being the rate determining step.
- Research Organization:
- Univ. of Minnesota Minneapolis, MN
- OSTI ID:
- 7120132
- Report Number(s):
- CONF-811013-
- Journal Information:
- Proc. - Electrochem. Soc.; (United States), Journal Name: Proc. - Electrochem. Soc.; (United States) Vol. 83-1; ISSN PESOD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of bicarbonate ion additives on pitting corrosion of type 316L stainless steel in aqueous 0.5 M sodium chloride solution
Conditions of growth of open corrosion pits in stainless steels -- Electrochemical experiments on model pits
Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ACTIVATION ENERGY
ALLOYS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CREVICE CORROSION
ELECTRIC PROBES
ELECTROCHEMISTRY
ELECTROLYTES
ENERGY
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IONS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
LANGMUIR PROBE
MATERIALS
MEASURING METHODS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXYGEN COMPOUNDS
PH VALUE
PITTING CORROSION
POTENTIOMETRY
PROBES
QUALITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
SULFATES
SULFUR COMPOUNDS
TITRATION