Abraham Alexis Becerra Araneda

Comisión Nacional de Energía Atómica | cnea · Instituto Sabato

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...

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),...

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 a stabilize...