E. Blasco-Tamarit

Cavitation—Corrosion Studies on Welded and Nonwelded Duplex Stainless Steel in Aqueous Lithium Bromide Solutions

Abstract The objective of this work was to study the effect of dynamic flow conditions (mechanical effect) on the cyclic potentiodynamic and potentiodynamic curves of EN 1.4462, its filler metal (E...

Corrosion Resistance and Galvanic Coupling of UNS N08031 Base Metal, Heat-Affected Zone, and Weld Metal in Phosphoric Acid at Different Temperatures

Abstract Open-circuit potential tests and potentiodynamic anodic polarization curves have been carried out to obtain information about the electrochemical behavior of a highly alloyed austenitic stainless steel (UNS N08031) used as base metal (BM), heat-affected zone (HAZ) region, and weld metal (WM). The weld was performed using the gas tungsten arc welding technique (GTAW) with a nickel-based alloy (UNS N06059) as filler metal. The galvanic corrosion generated by the electrical contact between the base metal, the HAZ, and the weld metal was estimated from the polarization diagrams according to the mixed potential theory. The objective of the present work was to study the effect of the solution temperature on the corrosion resistance of the studied materials. These materials were tested in 5.5 M phosphoric acid (H3PO4) solution at 25°C, 40°C, 60°C, and 80°C. Results demonstrated that materials passivated spontaneously in the studied solution and their corrosion resistance decreased with temperature.

The effect of Reynolds number on TiO2 nanosponges doped with Li+ cations

Anatase TiO2 nanosponges have been synthesized by anodization of Ti, and Li+ cations have been inserted in these nanostructures. The influence of hydrodynamic conditions (Reynolds number, Re = 0 to Re = 600) during anodization has been studied. Li-Doped TiO2 nanosponges were characterized by field emission scanning electron microscopy (FE-SEM), Raman confocal microscopy, electrochemical impedance spectroscopy (EIS) and Mott–Schottky analysis (M–S). The photoelectrochemical performance and resistance to photocorrosion were also measured. Li–TiO2 nanosponges proved to be better photocatalysts for water splitting than Li–TiO2 nanotubes. Moreover, the photoelectrochemical behavior of the Li-doped nanosponges improved as the Reynolds number increased.