Hojalata: evaluación de su comportamiento frente a la corrosión en medios acuosos

J.D. CULCASI; C.I. ELSNER; A.R. DI SARLI

Revista Internacional Información Tecnológica

Centro de Información Tecnológica

Lugar: La Serena; Año: 2010 vol. 21 p. 149 - 162

The first deterioration steps suffered by commercially available tinplate sheets exposed to different saline solutions were studied using electrochemical and surface analysis techniques, as well as optical and electronic scanning microscopies. Their results were analyzed and interpreted utilizing models able to adequately describe the degradation of those as complex as reactive metallic interfaces. It was concluded that: 1) independently of the medium, the main degradation of the metallic surface takes place within the first 24h immersion, but then its behavior is relatively stable and reproducible; 2) except in the buffer solutions based on borax or carbonate where the scarce corrosion products provided a protective effect, in the other electrolyte medium such products were, in general, a variety of non-protective iron oxyhydroxides; and 3) these results are in agreement with the electrochemically determined corrosion rates and, therefore, with the coating useful life.