Effects of alloy and solution chemistry on the fracture of passive films on austenitic stainless steel

Alamr, A.; Bahr, David F.; Jacroux, Michael

doi:10.1016/j.corsci.2005.02.018

Cited by 36 publications

(26 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The influences of pH and the salt concentration are almost negligible . Similar results were obtained for the films indented in air [37] .…”

Section: Empirical Assessment Of Stresses During Pile Upsupporting

confidence: 78%

“…[37,38] . In summary, an EG&G 173 and 175 potentiostat and controller were used to grow the passive films .…”

Section: Methodsmentioning

confidence: 99%

“…In our previous studies [37,38], ex-situ nanoindentation tests were made to investigate the influences of alloy and solution chemistries on the load required to fracture the passive film formed on austenitic stainless steel alloys at anodic potentials where the passive film is stable and metastable . For the passive film formed at a stable passive potential, the substrate on which the film was grown was the most significant factor affecting the load at fracture .…”

Section: 3 Film Fracture Testing In Corrosive Environmentsmentioning

confidence: 99%

“…The loads at fracture for the film tested in-situ and ex-situ [37,38] were used to roughly compute and compare the tensile stress applied needed to fracture the passive film using Hertzian contact mechanics.…”

Section: 3 Film Fracture Testing In Corrosive Environmentsmentioning

confidence: 99%

See 3 more Smart Citations

Development of experimental verification techniques for non-linear deformation and fracture on the nanometer scale.

Moody¹,

Bahr²

2005

View full text Add to dashboard Cite

This work covers three distinct aspects of deformation and fracture during indentations. In particular, we develop an approach to verification of nanoindentation induced film fracture in hard film / soft substrate systems ; we examine the ability to perform these experiments in harsh environments; we investigate the methods by which the resulting deformation from indentation can be quantified and correlated to computational simulations, and we examine the onset of plasticity during indentation testing.First, nanoindentation was utilized to induce fracture of brittle thin oxide films on compliant substrates . During the indentation, a load is applied and the penetration depth is continuously measured . A sudden discontinuity, indicative of film fracture, was observed upon the loading portion of the load-depth curve . The mechanical properties of thermally grown oxide films on various substrates were calculated using two different numerical methods . The first method utilized a plate bending approach by modeling the thin film as an axisymmetric circular plate on a compliant foundation . The second method measured the applied energy for fracture. The crack extension force and applied stress intensity at fracture was then determined from the energy measurements.Secondly, slip steps form on the free surface around indentations in most crystalline materials when dislocations reach the free surface . Analysis of these slip steps provides information about the deformation taking place in the material . Techniques have now been developed to allow for accurate and consistent measurement of slip steps and the effects of crystal orientation and tip geometry are characterized . These techniques will be described and compared to results from dislocation dynamics simulations.iii Finally, the stress required to cause fracture of passive films on stainless steels was studied using nanoindentation under in situ and ex situ conditions . For films formed at a passive potential, the alloy chemistry dominated the film strength . Increasing the electrolyte salt concentration from O .O1M NaCl to O .1M NaCl and changing the substrate on which the film was grown from 904L to 304 stainless steels reduced the applied tensile stress for fracture from 1 .74GPa to 1 .63GPa and from 1 .76GPa to 1 .63GPa, respectively . Trends in film strength as a function of environment are the same between in situ and ex situ testing, suggesting the two tests are both feasible methods of analyzing environmental effects on film strength.iv CONTENTS

show abstract

“…The influences of pH and the salt concentration are almost negligible . Similar results were obtained for the films indented in air [37] .…”

Section: Empirical Assessment Of Stresses During Pile Upsupporting

confidence: 78%

“…[37,38] . In summary, an EG&G 173 and 175 potentiostat and controller were used to grow the passive films .…”

Section: Methodsmentioning

confidence: 99%

Section: 3 Film Fracture Testing In Corrosive Environmentsmentioning

confidence: 99%

Section: 3 Film Fracture Testing In Corrosive Environmentsmentioning

confidence: 99%

See 2 more Smart Citations

Development of experimental verification techniques for non-linear deformation and fracture on the nanometer scale.

Moody¹,

Bahr²

2005

View full text Add to dashboard Cite

show abstract

“…In this case, the passivated atoms on the metal surface continuously oxidize and form an oxide film to resist the corrosion reaction. This process includes the oxygen mass transfer from the main flow region to the metal surface, 3 migrations of electrons in the films 4 and the oxidization of the Fe-alloy. 5 Some researchers defined the repassivation kinetics, which was determined with the anodic-current density, to indicate the growth of passive films.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle impingement on electrochemical properties of stainless steel in a jet flow

Cheng¹,

Zhang²,

Dou³

et al. 2018

Mater. Tehnol.

View full text Add to dashboard Cite

The objective of this research was to discuss the effects of physical impingement on the corrosion resistance of super 13Cr stainless steel in a solid-liquid jet flow. Data from standard laboratory tests including open-circuit potential (OCP), polarization potential, current and surface morphology was obtained. In addition, the passivation process at a changing flow velocity and after particle impacts were discussed using a point-defect model (PDM). The experimental results showed that particle impacts affect not only the electrochemical parameters but also the apparent structure of a sample, thus weakening the surface corrosion resistance of stainless steel. An uninterrupted particle impact damages loose passive films, decreases the electric potential and increases the current density. When the change in the potential reaches a stable state, the metal potential is gradually increased due to the influence of passivation; the passivation rate is the most significant at the beginning of the passivation and at a low flow velocity. Keywords: solid-liquid two-phase flow, electrochemical property, passive film, repassivation Predmet raziskave je bil raziskati vplive fizikalnih trkov na odpornost proti koroziji super nerjavnega jekla 13 Cr v toku me{a-nice kapljevine in trdne faze. Avtorji so podatke zbrali s pomo~jo standardnih laboratorijskih testov, kot so: potencial v odprtem tokokrogu (OCP; angl.: open-circuit potential), povr{inska morfologija, polarizacijski potencial in tok. Dodatno so uporabili model to~kovnih napak (PDM; angl.: Point Defect Model) za razlago procesa pasivacije v spreminjajo~ih se pogojih hitrosti pretoka medija po trkanju delcev na povr{ino vzorca. Rezultati preizkusov so pokazali, da trki delcev ne vplivajo samo na elektrokemi~ne procese temve~tudi na navidezno strukturo vzorca in s tem se slabi protikorozijska odpornost nerjavnega jekla. Neprekinjeno mesebojno trkanje (udarjanje oz. zadevanje) delcev po{koduje pasivni film in tako zmanj{a elektri~ni potencial ter pove~a gostoto toka. Ko sprememba potenciala dose`e neko stabilno vrednost, potencial kovine postopno naraste zaradi vpliva pasivacije in hitrost pasivacije je najbolj pomemben faktor na za~etku pasivacije pri majhni hitrosti pretoka. Klju~ne besede: dvofazni tok kapljevina-trdno, elektrokemijske lastnosti, pasivni film, repasivacija

show abstract

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

You

Chen

Yang

2018

Materials & Corrosion

View full text Add to dashboard Cite

The protectiveness and characterization of the passive film formed on Z3CN20.09M duplex stainless steel aged for different times were investigated by using electrochemical measurements and surface analysis method. The thermal aging causes the spinodal decomposition of the ferrite phase in the steel, resulting in the decrease of localized corrosion resistance. The increased aging time causes a thicker, dispersive, and lower resistance passive film formed on the surface of the steel based on EIS and Mott–Schottky (MS) analysis. The Auger electron spectroscopy (AES) and X‐ray photoelectron spectroscopy (XPS) results indicate that Cr is enriched in the inner layer of the passive films with a reduced content, decreasing the compactness and homogeneity of the passive films.

show abstract

Effects of alloy and solution chemistry on the fracture of passive films on austenitic stainless steel

Cited by 36 publications

References 25 publications

Development of experimental verification techniques for non-linear deformation and fracture on the nanometer scale.

Development of experimental verification techniques for non-linear deformation and fracture on the nanometer scale.

Effect of particle impingement on electrochemical properties of stainless steel in a jet flow

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

Contact Info

Product

Resources

About