GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Atmospheric Pitting Corrosion Studies of AA7075-T6 Under Electrolyte Droplets
    The Electrochemical Society ; 2017
    In:  ECS Meeting Abstracts Vol. MA2017-02, No. 10 ( 2017-09-01), p. 712-712
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2017-02, No. 10 ( 2017-09-01), p. 712-712
    Abstract: Pitting corrosion of AA7075-T6 was investigated in situ by Scanning Kelvin Probe (SKP) under droplets containing MgCl 2 and NaCl. The corroded samples were analyzed by optical microscope and optical profilometer. The SKP results indicated that single regions of sustained pitting attack formed with preference at the edge of the droplets due to shortened distance of oxygen diffusion. The pits at the sustained attack sites formed anodes with supporting cathodic reactions at the surrounding sample surface. As the pits grew, the cathodic region was observed to expand, leading to elevated potentials measured at the center of the droplets. Droplets with greater initial volume formed larger areas of contact with the sample surface and accelerated corrosion attack. Overall, sustained pitting attack was observed along groups of surface particles oriented along the rolling direction. In many cases, pitting led to the formation of a secondary droplet at the periphery of the primary droplet. A mechanism is proposed for the pitting behavior of AA7075-T6 under the studied electrolyte droplets, as well as a new mechanism for the formation of secondary droplets. This work was supported by Office of the Secretary of Defense Technical Corrosion Collaboration through the United States Air Force Academy.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2017-02/10/712
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2017
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Theoretical Relations between Electronic and Ionic Work Functions, Standard Reduction Potentials for Metal Dissolution and the Corrosion Potential
    The Electrochemical Society ; 2022
    In:  Journal of The Electrochemical Society Vol. 169, No. 8 ( 2022-08-01), p. 081506-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 169, No. 8 ( 2022-08-01), p. 081506-
    Abstract: Corrosion resistance has become an important factor to consider in integrated computational materials engineering, yet generating science-based indicators of corrosion resistance for hypothetical materials remains challenging. We explore the quantitative relations between work function and corrosion potential, taking a theoretical approach that considers the relation between these thermodynamic and kinetically-determined variables. The work function is a fundamental thermodynamic property of a metallic surface in isolation, whereas the corrosion potential is kinetically determined as the potential at which the rates of anodic and cathodic processes active on the metal surface are equal. The latter quantity is therefore time dependent, as well as dependent on the material, surface preparation, ageing/history and the environment. Reasoning from Mixed Potential Theory, we develop a rationale for the correlation between the corrosion potential and the electronic work function. Two distinct Born-Haber cycles for the anodic dissolution reaction are analyzed to allow calculation of a related quantity, the ionic work function, which embodies the energy of desorption for metal cations from an electrode. The ionic work function is not only highly correlated with, but of similar magnitude to the cation hydration energy. The theoretical analysis provided herein establishes the significance of not only the electronic work function, but also the ionic work function, cation hydration energy, cohesive energy and the ionization potential as co-descriptors for the corrosion resistance of candidate corrosion resistant metal alloys, with the role of the environment to be considered in future work.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ac86f8
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Role of Copper on Repassivation of Stainless Steel Pits
    The Electrochemical Society ; 2023
    In:  Journal of The Electrochemical Society Vol. 170, No. 7 ( 2023-07-01), p. 071503-
    Details
    In: Journal of The Electrochemical Society, The Electrochemical Society, Vol. 170, No. 7 ( 2023-07-01), p. 071503-
    Abstract: The effect of copper on the repassivation of pits in stainless steels was examined through potentiodynamic polarization of one-dimensional (1D) pits at two different downward scan rates for 17–4 PH stainless steel. Post-mortem characterization of tested 1D pits revealed that copper enriches on the pit surface, which most likely occurs through reduction of CuCl 3 2− inside the pit during the downward potential scan. 1D diffusion analysis revealed significant amounts of copper replating can occur before the attainment of critical pit chemistry for repassivation when scanning at a high rate, which complicates repassivation potential ( E rp ) measurements. Copper replating may lead to higher value of measured E rp by, (i) reducing the measured net anodic current density, (ii) blocking the dissolution of stainless steel underneath the copper deposits, (iii) enhancing local hydrogen evolution kinetics to raise the pH of the pit bottom. The relative strength of the copper replating effect is controlled by scan rate or more generally, pit growth conditions and local pit chemistry. Implications of the copper replating effect on measuring a lower-bound value of repassivation potentials are discussed in light of existing repassivation potential measurement techniques. The pit growth conditions that could lead to copper replating in real pits are discussed.
    Type of Medium: Online Resource
    ISSN: 0013-4651 , 1945-7111
    URL: Article
    DOI: 10.1149/1945-7111/ace339
    RVK:
    VA 4000
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2023
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Enhanced Crevice Corrosion of Stainless Steel 316 By Degradation of Cr-Containing Hollandite Crevice Former
    The Electrochemical Society ; 2022
    In:  ECS Meeting Abstracts Vol. MA2022-02, No. 11 ( 2022-10-09), p. 739-739
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2022-02, No. 11 ( 2022-10-09), p. 739-739
    Abstract: The disposal of high-level nuclear waste (HLW) is an important societal problem. It is also an extremely challenging corrosion research topic due to the highly complicated waste chemistry, long lasting radiation effect, and inevitable exposure to aqueous environments for hundreds of thousands of years. To safely accommodate some critical radionuclides such as volatile 129 I and strongly heat generating 137 Cs, numerous crystalline ceramic waste forms have been created and studied. Among the promising nuclear waste forms, hollandite was developed to isolate Cs waste and the corresponding decay product Ba due to the open tunnel structure capable of accommodating mono- or divalent cations. In this study, the synergistic corrosion interactions between a Cr-containing hollandite (Ba 1.15 Cr 2.3 Ti 5.7 O 16 ) and stainless steel (SS) 316 is explored. This is relevant to the permanent disposal of HLW involving the encasement of glass or crystalline ceramic waste forms containing immobilized radionuclides in a metallic canister made from corrosion resistant alloys such as SS. The experiments performed in this study simulate the potential corrosion interactions occurring at the interface of the SS and ceramic. After corroding the SS316 and Cr-containing hollandite in proximity in 0.6 M NaCl at 90 o C for 28 days, severe crevice corrosion was identified on the surface of the SS, as evidenced by the presence of large pits and crevice damage with diameters of hundreds of microns. Similarly, localized damage was also found at matching sites on the Cr-hollandite surface, indicating interactions between the two materials. The synergistic corrosion interaction was likely due to the continuous release of Cr 3+ cations from both materials, including the passive dissolution of the SS and the heterogenous degradation of the Cr-hollandite. The extra Cr 3+ cations originated from the hollandite reduces the incubation time required to reach the critical crevice solution condition, thereby accelerating the breakdown of the passive film of SS and the subsequent onset of active dissolution. An adapted crevice corrosion model is applied to quantitively explain the accelerated corrosion of SS observed in this study.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2022-0211739mtgabs
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Assessment of Conductive Sites on Carbon Fiber Reinforced Polymer Plastics' Surfaces Using Electrochemical Methods
    The Electrochemical Society ; 2022
    In:  ECS Meeting Abstracts Vol. MA2022-02, No. 29 ( 2022-10-09), p. 2460-2460
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2022-02, No. 29 ( 2022-10-09), p. 2460-2460
    Abstract: The components of automobile bodies have been manufactured primarily from steel since cars were first made. With the goal of energy savings, light-weighting is being adopted by substituting steel with a variety of light metals and composite materials. A DOE sponsored project in collaboration with PPG and Ford studied the use of automotive closure panels comprising an inner carbon fiber reinforced polymer (CFRP) sheet and an outer aluminum alloy (AA) sheet. The ends of closure panels are sealed with hem flange joints. A major concern is the formation of a galvanic cell within the joint wherein CFRP is the cathode that will accelerate the corrosion of the AA sheet. Various combinations of AA6xxx alloys with CFRP having two different orientations of carbon fiber, i.e., random and twill, are studied in this work. CFRP can only exert a galvanic driving force on a coupled AA panel by electrical connection at cut edges where sheared carbon fibers are exposed, or if carbon fibers are exposed on the CFRP panel surface by lack of coverage of the insulating epoxy matrix. It is believed that processing and curing variables lead to varied epoxy cover on the surfaces of CFRP. Electrochemical measurements such as the measurement of oxygen reduction limiting current density during cathodic polarization show that as-fabricated surfaces of CFRP panels exhibit some extent of electrochemical activity, indicating some lack of coverage of C fibers. It is of interest to characterize the epoxy cover on the CFRP surfaces in terms of the nature of the active sites (e.g., whether C fibers are totally uncovered or covered by a very thin layer of epoxy) and the density and distribution of the sites. A technique was developed to identify the exact locations of active sites on both random and twill CFRP by electrodeposition of small amounts of Cu. If the amount of deposited copper is small, the deposits indicate the location and number of the active sites on the CFRP surface. These deposits were also analyzed by serial sectioning using Focused Ion Beam/Scanning Electron Microscope. High resolution images of the deposit/epoxy interfaces provide a description of the nature of the defective/conductive regions on CFRP surfaces. Rotating disk electrode experiments were also performed to determine the oxygen reduction reaction (ORR) limiting current densities of CFRP at different electrode rotation rates i.e., different diffusion boundary layer thicknesses. These aspects are related to the overall mass transport in the electrolyte, which provides a deeper understanding of the kinetics on CFRP and the nature of active sites behaving as microelectrodes. The observations from the copper electrodeposition study and rotating disk electrode experiments will be correlated and the role of CFRP as a cathode contributing to the corrosion of AA in the galvanic couple will be presented. This work was supported by the U.S. Department of Energy through award DE-EE0007760, in collaboration with PPG Industries and Ford Motor Company.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2022-02292460mtgabs
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2022
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Microstructure and Electrochemistry of Al-Rich Primer
    The Electrochemical Society ; 2020
    In:  ECS Meeting Abstracts Vol. MA2020-02, No. 13 ( 2020-11-23), p. 1336-1336
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2020-02, No. 13 ( 2020-11-23), p. 1336-1336
    Abstract: Al-rich primer (AlRP) is designed to be anodic relative to high strength Al alloys, so that it drives the mixed potential of Al alloy substrates (e.g. AA2024) into the cathodic region below the breakdown potentials of the Al alloys, preventing localized corrosion. The Al-rich primer (AlRP) under study is composed of spherical Al-Zn-In pigments in an epoxy binder. The 2D and 3D microstructure of the AlRP was studied using a combination of X-ray microscopy, plasma focus ion beam/scanning electron microscopy, and transmission electron microscopy techniques. The primer contained Al-Zn-In particles with various sizes ranging from tens of nanometers to microns, epoxy binder and a significant volume of voids. Potentiodynamic polarization testing was performed to measure the electrochemistry of the Al-Zn-In bulk alloy under neat primer in NaCl solution to simulate the environment which Al-Zn-In pigments are exposed to in the real primer. The bulk alloy under neat primer exhibited higher breakdown potential than the bare bulk alloy exposed to NaCl solution. The polarization curves of the bulk alloy under neat primer provide more accurate boundary conditions for modeling of the galvanic interaction between the AlRP and an alloy substrate. Galvanic corrosion between an AA2024 sample and Al-Zn-In bulk alloy was also studied using a zero resistance ammeter. A trivalent chromium process treatment on galvanic couples can protect AA2024 substrate from cathodic corrosion. Acknowledgements: this project is funded by the Office of Naval Research through the Small Business Innovation Research (SBIR) program. We thank Naval Air Systems Command (NAVAIR) for providing Al-rich primer samples. We acknowledge Dr. Mansoureh Norouzi Rad at Zeiss for 3D microstructure reconstruction on Al-rich primer using X-ray microscope, and Thermo Fisher Scientific for 3D microstructure reconstruction on Al-rich primer using Helios Plasma FIB/SEM. We appreciate Dr. Babu Viswanathan at OSU for STEM characterization, and Swagelok Center for Surface Analysis of Materials (SCSAM) at Case Western Reserve University for Ar ion polishing.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2020-02131336mtgabs
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2020
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Explanation of the Electrochemical Behavior of Salt Film in Pit Growth
    The Electrochemical Society ; 2019
    In:  ECS Meeting Abstracts Vol. MA2019-02, No. 11 ( 2019-09-01), p. 832-832
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-02, No. 11 ( 2019-09-01), p. 832-832
    Abstract: A unifying framework has recently been developed to describe the critical conditions for pit growth stability and salt film formation 1-3 . It was shown that a salt film is not required for pit stabilization; it is just a consequence of a pit achieving diffusion-controlled growth. A salt film can form on the surface of both metastable and stable pits when the maximum pit dissolution current density, i diss,max , exceeds the diffusion-limited current density, i lim . In this work, the unifying framework is further expanded to establish a mathematical model describing the electrochemical behavior of salt film after it precipitates, i.e. the situation when i diss,max 〉 i lim . It can be mathematically shown that the main function of a salt film during diffusion-controlled pit growth is to accommodate the extra potential of ( E max - E sat ) by regulating its thickness to adjust the actual potential at the pit surface to E sat and thus restricting the anodic dissolution current density at the diffusion-limited value 4 . Therefore, the salt film will respond to any changes of the applied potential, temperature, pit depth, and perforation radius of the pit cover. This new model can explain the current peak observed during the downward potential scan of a 1D pit at the transition point from diffusion-controlled region to charge-transfer-controlled region. According to this new model, the current peak results from the supersaturation generated by thinning of the salt film during the downward scan. The model predicts that the amplitude of the current peak decreases with decreasing scan rate, which is in agreement with the experimental results from 1D artificial electrode, providing strong support for the validity of the new model. Acknowledgments: This work was supported as part of the Center for Performance and Design of Nuclear Waste Forms and Containers, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0016584. Reference G. S. Frankel, T. Li and J. R. Scully, Journal of the Electrochemical Society 164 , C180-C181 (2017). T. Li, J. R. Scully and G. S. Frankel, Journal of The Electrochemical Society 165 , C484-C491 (2018). T. Li, J. R. Scully and G. S. Frankel, Journal of The Electrochemical Society 165 , C762-C770 (2018). T. Li, J. R. Scully and G. S. Frankel, Journal of The Electrochemical Society 166 , C115-C124 (2019).
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2019-02/11/832
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2019
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Localized Corrosion: Passive Film Breakdown Vs. Pit Growth Stability
    The Electrochemical Society ; 2017
    In:  ECS Meeting Abstracts Vol. MA2017-02, No. 11 ( 2017-09-01), p. 753-753
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2017-02, No. 11 ( 2017-09-01), p. 753-753
    Abstract: A debate about the critical step in localized corrosion has raged for decades. Some researchers focus on the composition and structure of the passive film associated with the initial breakdown of the film, whereas others consider that the susceptibility to pitting is controlled by the pit growth kinetics and the stabilization of pit growth. The basis for a unified theory of pitting is presented here in which pit stability considerations are controlling under aggressive conditions (harsh electrolytes and extreme environments and/or susceptible microstructures) and the passive film properties and protectiveness are the critical factors in less extreme environments and/or for less susceptible alloys. This work was supported as part of the Center for Performance and Design of Nuclear Waste Forms and Containers, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0016584.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2017-02/11/753
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2017
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    (Corrosion Division H.H. Uhlig Award Address) Contributions to the Understanding of Localized Corrosion
    The Electrochemical Society ; 2010
    In:  ECS Meeting Abstracts Vol. MA2010-02, No. 13 ( 2010-07-08), p. 1203-1203
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2010-02, No. 13 ( 2010-07-08), p. 1203-1203
    Abstract: Abstract not Available.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2010-02/13/1203
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2010
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Corrosion and Cracking of Carbon Steel in Fuel Grade Ethanol: Supporting Electrolyte and Susceptible Potential Regime
    The Electrochemical Society ; 2010
    In:  ECS Meeting Abstracts Vol. MA2010-02, No. 14 ( 2010-07-08), p. 1244-1244
    Details
    In: ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2010-02, No. 14 ( 2010-07-08), p. 1244-1244
    Abstract: Abstract not Available.
    Type of Medium: Online Resource
    ISSN: 2151-2043
    URL: Article
    DOI: 10.1149/MA2010-02/14/1244
    Language: Unknown
    Publisher: The Electrochemical Society
    Publication Date: 2010
    detail.hit.zdb_id: 2438749-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...