Abraham Alexis Becerra Araneda

• PhD MSc Eng Materials and Technology
• Escuela de Hábitat y Sostenibilidad at National University of General San Martín

Rural migration and rapid urban growth have led to socio-environmental problems in many Latin American cities, of which waste accumulation, housing shortages, and unemployment are three of the most obvious. Conventional waste management strategies and scholarly discourses on the circular economy pay little attention to the practice of informal wast...

Nowadays, great efforts are being made to develop bcc-superalloys for medium- and high-temperature applications. However, the high brittle-to-ductile transition temperatures (BDTT) have restricted their application. Therefore, designing hot-processing routes to obtain a refined grain in these new superalloys is required. Particularly in the Fe-10Al...

Alloys 600 and 800 exhibited stable pitting corrosion in 1 M NaCl plus thiosulfate deaerated solutions at the open circuit potential (OCP) and room temperature. Alloy 690 exhibited only metastable pitting. Stable pitting, stable passivity or metastable pitting were identified by observing features in the OCP vs. time transients and by analysis of e...

Ni-Cr-Fe alloys such as UNS N08800 (alloy 800) suffer pitting corrosion in chloride (Cl−) plus thiosulfate (S2O32−) solutions. This occurs due to a synergistic effect between both ions in a certain range of solution concentration and electrochemical potential. Potentiodynamic tests in 1 M NaCl + 10−3 M S2O32− solutions evidenced thiosulfate pitting...

Low potential pitting corrosion (LPPC) of alloys 690 and 800 (UNS N06690 and N08800) was studied in neutral solutions, containing chloride ion from 0.1 to 1 M and thiosulfate ion from 5x10-5 to 10-3 M. LPPC occurred close to the corrosion potential (-0.25 VAg/AgCl) by a synergic effect of the chloride and thiosulfate ions. The threshold concentrati...

The presence of thiosulfate ions in chloride solutions may produce pitting corrosion of UNS N06690 (alloy 690) and UNS N08800 (alloy 800). These alloys are the current options for steam-generator tubing of nuclear reactors. Two submodes of pitting corrosion in chloride plus thiosulfate solutions were observed in both alloys: low potential pitting c...

Pitting corrosion of alloys 600, 690, and 800 (UNS N06600, N06690 and N08800) was studied in 1 M NaCl solution with different concentrations of thiosulfate (S2O32-). Alloys exhibited vastly different electrochemical behavior, depending on the S2O32- concentration and chromium content of the alloy. Alloy 600 exhibited a breakdown and repassivation p...

Alloys UNS N06600, N06690 and N08800 used for steam generator tubes are prone to pitting corrosion in aqueous chloride-thiosulfate solutions. Pitting corrosion was studied in 0.1 to 1 M chloride solutions with additions of thiosulfate ranging from 10-4 M to 10-2 M, at room temperature. The alloys were tested in solution annealed and thermally aged...

Nickel base alloys 600 690 and 800 are used in steam generator tubing of nuclear reactors. These alloys can suffer pitting corrosion problems in chloride solutions in the presence of thiosulfate in a similar manner to what was studied in more detail in stainless steels. Thiosulfate may be present in the environment to which these alloys are exposed...

Films of poly(vinyl chloride)/copper (Cu) nanocomposites exhibiting reduced bacterial adhesion were prepared by film-casting method. Cu nanoparticles (NPs) synthesized using polyol method and stabilized with poly(N-vinyl-2-pyrrolidone) (PVP) at different Cu/PVP molar ratio were previously characterized using transmission electron microscopy (TEM),...

Background The objective of this study was to clarify the intermolecular interaction between antibacterial copper nanoparticles (Cu NPs) and sodium alginate (NaAlg) by Fourier transform infrared spectroscopy (FT-IR) and to process the spectra applying two-dimensional infrared (2D-IR) correlation analysis. To our knowledge, the addition of NaAlg as...