Mechanical Properties and Tensile Failure Analysis of Novel Bio-absorbable Mg-Zn-Cu and Mg-Zn-Se Alloys for Endovascular Applications

metal

Use of Coupled Multi-Electrode Arrays to Advance the Understanding of Selected Corrosion Phenomena

The use of coupled multi-electrode arrays in various corrosion applications is discussed with the main goal of advancing the understanding of various corrosion phenomena. Both close-packed and far-spaced electrode configurations are discussed. Far-spaced electrode arrays are optimized for high throughput experiments capable of elucidating the effects of various variables on corrosion properties. For instance, the effects of a statistical distribution of flaws on corrosion properties can be examined. Close-packed arrays enable unprecedented spatial and temporal information on the behavior of local anodes and cathodes. Interactions between corrosion sites can trigger or inhibit corrosion phenomena and affect corrosion damage evolution

Coupled Multielectrode Investigation of Crevice Corrosion of AISI 316 Stainless Steel. Electrochemical and solid-state letters 2007;10(3):C16

Abstract I Close packed coupled multi-electrodes arrays (MEA) simulating a planar electrode were used to measure the current evolution as a function of position during initiation and propagation of crevice corrosion of AISI 3 16 stainless steel. Scaling laws derived from polarization data enabled the use of rescaled crevices providing spatial resolution. Crevice corrosion of AlSl 3 16 stainless steel in 0.6 M NaCl at 50°C was found to initiate close to the crevice mouth and to spread inwards with time. The local crevice current density increased dramatically over a short period to reach a limiting value

Sudden onset of pitting corrosion on stainless steel as a critical phenomenon

Stainless steels undergo a sharp rise in pitting corrosion rate as the potential, solution concentration or temperature is changed only slightly. We report experiments using real-time microscopic in situ visualizations that resolve the nucleation and evolution of individual pits during the transition. They suggest that the sudden corrosion onset is explained by an explosive autocatalytic growth in the number of metastable pits and that stabilization of individual pits takes place only later. This finding agrees with a theoretical approach treating the onset of pitting corrosion as a cooperative critical phenomenon resulting from interactions among metastable pits and extends perspectives on control and prevention of the corrosion onset