Pitting Corrosion of Metals

Newman, R.C.

doi:10.1149/2.f03101if

Cited by 51 publications

(29 citation statements)

References 43 publications

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“…This basic idea has proven extremely powerful in helping to understand many of the characteristics of pitting corrosion 2 . Building on Galvele's early model, it has been shown 3,4 that metastable pits in 304 stainless steel propagate such that i.x increases with time, and that once this exceeds ~3 mA cm -1 then they are able to survive the complete loss of their porous cover and can be considered stable.…”

Section: Introductionmentioning

confidence: 99%

(Invited)Localized Dissolution Kinetics From Fast In Situ Radiography of Propagating Pits in Stainless Steel and Implications for Modeling Pitting Corrosion over Long Time-Scales

Laycock

Krouse²,

Ghahari

et al. 2012

ECS Trans.

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In-situ synchrotron radiography has been used to observe propagating 2D pits in a thin foil of 304 stainless steel sandwiched between glass slides. Key kinetic parameters have been extracted from these radiographs such that they can be used as input parameters for numerical simulations of pitting corrosion. Simulation results are presented for pits growing under potentiostatic control, with a focus on propagation stability in the concentrated (> 1M) chloride solutions that cause atmospheric pitting corrosion of 304 stainless steel.

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Section: Introductionmentioning

confidence: 99%

(Invited)Localized Dissolution Kinetics From Fast In Situ Radiography of Propagating Pits in Stainless Steel and Implications for Modeling Pitting Corrosion over Long Time-Scales

Laycock

Krouse²,

Ghahari

et al. 2012

ECS Trans.

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“…In many studies of pitting corrosion in NaCl solutions, E b has been found to exhibit a negative logarithmic dependence on the chloride concentration, with the proportionality constant generally being in the range 60–90 mV . In the case of 304 stainless steel, for example, the proportionality constant is 88 mV .…”

Section: Discussionmentioning

confidence: 98%

The electrochemical behavior of nitinol in simulated gastric fluid

Pound

2016

J Biomed Mater Res

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Increased use is being made of nitinol for implants that are exposed to gastric fluid. However, few corrosion studies have involved nitinol in an appropriate acidified chloride solution. In this work, the electrochemical behavior of electropolished (EP) nitinol was examined in simulated gastric fluid, the corresponding neutral solution with the same concentration (0.6%) of NaCl, and 0.9% NaCl. Cyclic potentiodynamic polarization was used to evaluate the susceptibility to pitting corrosion, while electrochemical impedance spectroscopy was used to examine the passive oxide film. The potentiodynamic tests showed that the susceptibility of EP nitinol to pitting corrosion is affected by chloride concentration and pH. Acidification, in particular, resulted in the susceptibility being markedly higher in gastric fluid compared with that in the corresponding neutral NaCl solution. The impedance data could be fitted using a parallel resistance-capacitance (as a constant phase element) circuit associated with the oxide film. The thickness of the oxide was determined from the capacitive component and found to be little affected by chloride concentration. In contrast, acidification increased the solubility of the oxide enough to decrease the thickness of the film from 5.3 nm in 0.6% NaCl to 4.2 nm in gastric fluid. The resistivity of the oxide obtained from the resistance was affected by chloride concentration (0.7 × 10 and 1.7 × 10 Ω m in 0.9% and 0.6% NaCl, respectively) and particularly by pH (6.3 × 10 Ω m in gastric fluid). The resistivity values suggest that the oxide was more defective in the neutral solutions. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B:2394-2400, 2017.

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“…The two corrosion phenomena, pitting corrosion and the galvanic corrosion, can be correlated in consideration of the pit development stages [35,36]. The pitting corrosion is initiated by the breakdown of the passive film.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…In this paper, the pitting corrosion resistance of the DSS2507 alloy was assessed based on the E pit level, and that was determined as the potential point at which the stable pit was A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 16 initiated and began to grow. During the stable pit growth in Fe-based metals, the electrolyte inside the occluded pit becomes acidified because of the hydrolysis reaction [35,36]. Thus, inside the pit, the bare surface of the metal without the passive film is exposed to the acidified solution.…”

Section: Accepted Manuscriptmentioning

confidence: 99%