Nitrite corrosion inhibition in chloride-rich electrolytes correlated to the electrical properties of surface films on carbon steel
| Autor: | W. H. Schreiner, M.B. Valcarce, M. Vázquez, Maria Alejandra Frontini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Recubrimientos y Películas
Carbon steel Nitrite Inorganic chemistry 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Electrolyte INGENIERÍAS Y TECNOLOGÍAS engineering.material Electrochemistry Chloride 0201 civil engineering Corrosion Ion chemistry.chemical_compound Ingeniería de los Materiales 021105 building & construction medicine General Materials Science Porosity Civil and Structural Engineering Chemistry Inhibitors Building and Construction Steel engineering medicine.drug |
| Popis: | The electronic properties and the composition of surface films grown in pore simulating solutions are studied using various electrochemical and surface techniques and then correlated to the inhibiting efficiency of nitrite ions in chloride-rich alkaline solutions. In nitrite-free and chloride-rich solutions, the external layer of the surface film is porous, defective and rich in Fe(III). Instead, when nitrite and chloride ions are simultaneously present, the Fe(II) content increases and the film becomes thicker, ordered and more protective. In the absence of nitrite ions, chloride ions induce high donor densities that correlate to a high susceptibility to localized corrosion. In contrast, the donor density decreases noticeably when nitrites and chlorides are both present and also increases with ageing time, reaching values comparable to those calculated for uncontaminated solutions. Fil: Frontini, María Alejandra. Universidad Nacional de Mar del Plata. Facultad de Ingeniería; Argentina Fil: Schreiner, Wido H.. Universidade Federal do Paraná; Brasil Fil: Vazquez, Marcela Vivian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina Fil: Valcarce, María Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina |
| Databáze: | OpenAIRE |
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