A5070439499- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Electron and X-Ray Spectroscopy Techniques
- Aluminum Alloy Microstructure Properties
- Non-Destructive Testing Techniques
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Concrete Corrosion and Durability
- Anodic Oxide Films and Nanostructures
- Advanced Welding Techniques Analysis
- Aluminum Alloys Composites Properties
- Metal and Thin Film Mechanics
- Electrochemical Analysis and Applications
- Titanium Alloys Microstructure and Properties
- Semiconductor materials and devices
- Welding Techniques and Residual Stresses
- Material Properties and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Orthopaedic implants and arthroplasty
- High-Temperature Coating Behaviors
- Crystallography and molecular interactions
- Nuclear Materials and Properties
- Electrodeposition and Electroless Coatings
- Iron oxide chemistry and applications
- Electrocatalysts for Energy Conversion
University of Birmingham
2014-2024
The Edgbaston Hospital
2013-2018
University College Birmingham
2015
Defence Materials Technology Centre (Australia)
2010
University of Pennsylvania
2003
Northwestern University
1999
National University of Rosario
1999
Seoul National University
1999
National Tsing Hua University
1999
University of Manchester
1997-1998
In situ current density mapping, scanning electron microscopy, and energy dispersive spectroscopy were used to study the effects of cerium as a corrosion inhibitor for an aluminum copper alloy (Al 2024‐T4) in chloride containing solutions. It was found that inhibits this by reducing rate cathodic reaction. This due formation cerium‐rich films over intermetallics which act local sites. Results from tests carried out on aluminum/copper galvanic couple, simulate electrochemical behavior...
The deposition of cerium‐rich films on copper under cathodic polarization was studied as a model system for understanding the mechanism corrosion inhibition copper‐containing aluminum alloys. Deposition also gold and iron comparison with copper. Inhibition alloys is achieved by film intermetallics that blocks reduction oxygen at these sites. X‐ray absorption near‐edge structure measurements show precipitated from aerated solutions are in tetravalent state. Thermodynamically, Pourbaix diagram...
In situ surface X‐ray diffraction was used to identify the detailed structure of passive film that forms on (000)− and (110)‐oriented iron single crystals in a borate buffer solution at +0.4 V vs. mercurous sulfate reference electrode, high potential. The is new phase: spinel with fully occupied oxygen lattice, octahedral site occupancy 80 ± 10%, tetrahedral 66 an interstitial 12 4%. epitaxial relationship substrate iron; for growth Fe(001), film(001)||Fe(001) , while Fe(110),...
In situ x-ray-scattering studies of the Au(111) electrode surface have been carried out in NaF, NaCl, LiCl, CsCl, KCl, and NaBr solutions using grazing-incident-angle diffraction reflectivity techniques. The top layer gold atoms undergoes a reversible phase transition between (1\ifmmode\times\else\texttimes\fi{}1) bulk termination (p\ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 ) uniaxial discommensuration (striped) on changing potential. Below critical potential, all solutions,...
In situ x-ray specular reflectivity and glancing-incidence-angle x-ray-diffraction measurements have been performed at the Au(001) surface in a 0.01M ${\mathrm{HClO}}_{4}$ solution under potential control an electrochemical cell. At -0.4 V versus Ag/AgCl electrode, gold exhibits hexagonal reconstructed layer with mass density 21% greater than underlying bulk layers. The reconstruction disappears above 0.5 V, excess atoms form new atomic corresponding to 22% of layer. fully recovers below -0.3 V.
We have used x-ray scattering to measure the structure of passive oxide film formed at high anodic potentials on Fe(110) and Fe(001). The crystalline has a small crystallite size ( $\ensuremath{\approx}50\AA{}$) is oriented with substrate. based ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$, but cation vacancies octahedral tetrahedral sites (80% 66% occupancies, respectively) cations occupying interstitial (12% occupancy). These results resolve long-standing controversy surrounding provide basis for...
In situ synchrotron X-ray radiography was used to observe the evolution of 2D pits growing at edge stainless steel foils in chloride solutions varying concentrations under current and potential control. A method developed for measuring local anodic density along perimeter from rate advance pit into metal. Pit depth tends increase with time kinetics consistent diffusion control (under a salt layer), whereas lateral development (on film-free surfaces) is influenced by solution conductivity....
Synchrotron surface x-ray scattering (SXS) studies have been carried out at the Au(111)/electrolyte interface to determine influence of charge on microscopic arrangement gold atoms. At electrochemical interface, density can be continuously varied by controlling applied potential. The top layer atoms undergoes a reversible phase transition between (1 × 1) bulk termination and (23 √3) reconstructed changing electrode In order differentiate respective roles adsorbates, were in 0.1 M NaF, NaCl,...
AA5182 (Al-4.5 wt% Mg) can become susceptible to intergranular corrosion (IGC) with time at moderately elevated service temperatures owing precipitation of Mg-rich β-phase grain boundaries, which lead stress cracking (SCC). The IGC and SCC susceptibility was found depend strongly on sensitisation heat treatments. AFM TEM studies demonstrated that the degree thus attack for a boundary be related its crystallographic misorientation. Low angle boundaries (<20°) are most resistant as they do...
Globally, more than 1000 tonnes of titanium (Ti) is implanted into patients in the form biomedical devices on an annual basis. Ti perceived to be ‘biocompatible’ owing presence a robust passive oxide film (approx. 4 nm thick) at metal surface. However, surface deterioration can lead release ions, and particles arise as result wear and/or corrosion processes. This peri-implant inflammation, leading premature loss device or requirement for surgical revision. Soft tissues surrounding...
A. J. Davenport and S. Rowlinson, Trans. Faraday Soc., 1963, 59, 78 DOI: 10.1039/TF9635900078
There is increasing concern regarding the biological consequences of metal release from implants. However, mechanisms underpinning implant surface degradation, especially in absence wear, are often poorly understood. Here synergistic effect albumin and H2O2 on corrosion Ti6Al4V physiological saline studied with electrochemical methods. It found that induces a time-dependent dissolution presence physiology saline. Potentiostatic polarisation measurements show supresses at short times (<24 h)...
An interpretation of current‐time transients describing anodic oxide film growth on metals is presented. When the rate controlled by ion conduction under high electric field, classical theory Cabrera and Mott leads to shallow curvature in plots vs. . Such data can be linearized using an integrated form Mott's equation. The predicted current transient shows decaying linearly as from which parameters may calculated. equations distinguish sensitively between Cabrera‐Mott kinetics direct...
The drive to develop better electrochemical energy storage devices requires the development of not only new materials, but also understanding underpinning chemical and dynamical processes within such during operation, for which analytical techniques are required. Currently, there few that can probe local composition transport in electrolyte battery operation. In this paper, we report a novel application magnetic resonance imaging (MRI) probing model cell. Using MRI, zinc oxygen...
Titanium and its alloys are routinely used as biomedical implants usually considered to be corrosion resistant under physiological conditions. However, during inflammation, chemical modifications of the peri-implant environment including acidification occur. In addition certain biomolecules lipopolysaccharide (LPS), a component Gram-negative bacterial cell walls driver inflammation have been shown interact strongly with Ti modify resistance. microbes abundant in biofilms which form on dental...
Aseptic lymphocyte-dominated vasculitis-associated lesion (ALVAL) has been used to describe the histological associated with metal-on-metal (M-M) bearings. We tested hypothesis that lymphoid aggregates, ALVAL lesions resemble tertiary organs (TLOs). Histopathological changes were examined in periprosthetic tissue of 62 M-M hip replacements requiring revision surgery, particular emphasis on characteristics and pattern lymphocytic infiltrate. Immunofluorescence immunohistochemistry study...
The morphology of atmospheric pitting corrosion in 304L stainless steel plate was analysed using MgCl(2) droplets relation to changes relative humidity (RH) and chloride deposition density (CDD). It found that highly reproducible morphologies occur are distinct at different RH. Pitting higher concentrations, i.e. lower RH, resulted satellite pits forming around the perimeter wide shallow dish regions. At these did not form instead spiral attack into region observed. Increasing CDD saturation...