| Autor: |
Herrera Hernández H; Laboratorio de Investigación en Electroquímica y Corrosión de Materiales Industriales, Universidad Autonoma del Estado de Mexico, CU Valle de Mexico, Blvd. Universitario s/n, Predio San Javier, Atizapan de Zaragoza 54500, Mexico., Mandujano Ruiz A; Laboratorio de Investigación en Electroquímica y Corrosión de Materiales Industriales, Universidad Autonoma del Estado de Mexico, CU Valle de Mexico, Blvd. Universitario s/n, Predio San Javier, Atizapan de Zaragoza 54500, Mexico., González Morán CO; Laboratorio de Investigación de Materiales y Procesos Inteligentes, Universidad Autonoma del Estado de Mexico, CU Valle de Mexico, Blvd. Universitario s/n, Predio San Javier, Atizapan de Zaragoza 54500, Mexico., Miranda Hernández JG; Laboratorio de Investigacion y Desarrollo de Materiales Industriales, Universidad Autonoma del Estado de Mexico, Blvd. Universitario s/n, Predio San Javier, Atizapan de Zaragoza 54500, Mexico., Flores Cuautle JJA; CONAHCYT-Tecnologico Nacional de Mexico, Instituto Tecnologico de Orizaba, Oriente 9, Orizaba 94320, Mexico., Morales Hernández J; Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Parque Tecnologico Queretaro s/n, Sanfandila, Pedro Escobedo, Queretaro 76703, Mexico., Hernández Casco I; UAP Tianguistengo, Ingenieria en Producción Industrial, Universidad Autonoma del Estado de Mexico, Paraje el Tejocote, San Pedro Tlaltizapan, Santiago Tianguistengo 52640, Mexico. |
| Abstrakt: |
Sulfuric acid anodizing assisted by a hydrothermal sealing with inhibitors [Ce 3+ -Mo 6+ ] was used to prevent pitting corrosion on spray-deposited hypereutectic Al-Si alloy (A390). An investigation concerning the evaluation of pitting corrosion resistance on the anodic oxide thin film with ions incorporated was carried out in NaCl solution using electrochemical measurements (i.e., potentiodynamic polarization and electrochemical impedance spectroscopy, EIS). The influence of Si phase morphology and size on the growth mechanism of an anodic oxide film was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results were then compared with those for its equivalent IM390 alloy (Al-17Si-4.5Cu-0.6Mg) produced through a conventional process ingot metallurgy, IM. The electrochemical findings indicate that sulfuric acid anodizing followed by a simple hot water sealing treatment was ineffective. In this manner, an intense attack was localized by pitting corrosion that occurred on the anodic oxide film in less than three days, as denoted by characteristic changes in the EIS spectra at the lowest frequencies. Improved results were achieved for Ce-Mo surface modification, which can provide better corrosion resistance on the aluminum alloys because no signs of pits were observed during the corrosion testing. |
