The role of passive film growth kinetics and properties in stress corrosion and crevice corrosion susceptibility

Kruger, J; Ambrose, J R

doi:10.6028/nbs.ir.73-244

Cited by 1 publication

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“…At 0% Cl − ion concentration, the corrosion rate is 0.374 mm/y which correlates to corrosion current density of 3.48 × 10 5 A/cm 2 and polarization resistance of 738.4 Ω. The result is due to the reactivity of SO 4 2ions in the acid solution which chemically displaced the adsorbed O 2 molecules causing the passivation of the steel (Kruger et al, 1975;Maurice & Marcus, 2018;Raja & Jones, 2006;Uhlig, 1958). The SO 4 2ions react with the substrate Fe leading to anodic degradation of the steel.…”

Section: Potentiodynamic Polarization Studiesmentioning

confidence: 96%

Corrosion resistance study of 439L ferritic stainless steel subjected to high temperature variation

Loto

Stokes

2021

Cogent Engineering

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Automobile production plants have advanced the utilization of stainless steel alloys for the production of exhaust mufflers due to corrosion failures associated with their operating lifespan and conditions of application. Corrosion vulnerability of as received and heat treated (500oC and 1000oC) 439 L ferritic stainless in 3.5 M H 2 SO 4 electrolyte at 0% to 6% NaCl concentration was evaluated with potentiodynamic polarization, potentiostatic measurement, open circuit potential measurement, and optical microscopy characterization. Potentiodynamic polarization results show heat treatment improved the general corrosion resistance of the steel. Heat treated 439 L steel at 500°C displayed the lowest corrosion rate trailed by the heat treated steel at 1000°C. However, potentiostatic measurement shows that heat treatment decreases the resistance of the steel to localized corrosion deterioration from inspection of the metastable pitting current and passivation potential values. Results from open circuit potential measurement show heat treatment increases the thermodynamic tendency for 439 L steel to corrosion while improving its corrosion resistance. Optical images of the as-receive and heat treated steels show the presence of numerous corrosion pits and corrosion along the grain boundaries. However, the extent of deterioration is significantly higher for the asreceived steel.

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Section: Potentiodynamic Polarization Studiesmentioning

confidence: 96%