30 research outputs found
Journal focus: Corrosion Engineering, Science and Technology
No full textJournal focus: Corrosion Engineering, Science and Technolog
CES & T special edition to commemorate the contribution of professor Brain Cherry to corrosion engineering OBITUARY
No full textCES & T special edition to commemorate the contribution of professor Brain Cherry to corrosion engineering OBITUAR
New magnesium/arsenic alloy is corrosion resistant
No full textNew magnesium/arsenic alloy is corrosion resistan
Unravelling the characteristics of Al-alloy corrosion at the atomic to nanometre scale by transmission electron microscopy
No full textThe localised corrosion associated with Mg2Si in the Al-matrix of an Al-Mg-Si alloy was studied in 0.1 M NaCl at pH 6 by quasi in-situ transmission electron microscopy. Herein, physical imaging of corrosion at the atomic to nanometre scale was performed. Phase transformation and subsequent chemical composition variations associated with the localised corrosion of Mg2Si were studied. It was observed that corrosion initiated upon Mg2Si, often preferentially at the interface with the Al-matrix, and propagated until Mg2Si was completely dealloyed by Mg-dissolution, resulting in an amorphous SiO-rich phase remnant. The SiO-rich remnant became electrochemically inert and did not initiate corrosion in the Al-matrix. This study provides a clear understanding on the localised corrosion of Al-alloys associated with Mg2Si. In addition, the methodology followed in this study can also be applied to understand the role of precipitates and second phase particles in the localised corrosion of Al-alloy systems
An Overview of High-energy Ball Milled Nanocrystalline Aluminum Alloys Introduction
No full textAn Overview of High-energy Ball Milled Nanocrystalline Aluminum Alloys Introductio
Electrochemical Stability of Magnesium Surfaces in an Aqueous Environment
No full textAn insight into the
electrochemical stability of Mg surfaces is
of practical importance for improving the corrosion resistance of
Mg as well as its performance as a battery electrode. The present
paper employs first-principles density functional theory simulations
to study the electrochemical stability of magnesium surfaces in aqueous
environments. A number of electrochemical reactions that describe
the interactions between the Mg(0001) surface and water were analyzed.
It was verified that water dissociation is favored upon the Mg surface,
in agreement with recent works; however, it is also shown that the
previously unstudied Heyrovsky reaction may play an important role
in controlling the surface stability. Furthermore, it was found that
the surface stability also crucially depends on the concentration
of adsorbed hydroxyl groups. Specifically, the surface work function
was determined to vary as the function of hydroxyl coverage, which
has ramifications for the catalytic behavior of the Mg surface. The
influences of surface doping with Ca (a reactive element) and Fe (a
comparatively noble element) were also studied to provide an atomic-level
understanding of how the dopants influence surface properties and
subsequent electrochemical reactions. With a keen recent empirical
interest in Mg surface stability given the industrial relevance of
Mg, the present study provides key new insights into the physical
processes related to the enhanced catalytic activity of Mg and its
alloys
Average Rockwell Hardness (HRC) and roughness (R<sub>a</sub>) as a function of VED used to prepare specimens.
No full textAverage Rockwell Hardness (HRC) and roughness (Ra) as a function of VED used to prepare specimens.</p
