Effect of surface treatments based on self-assembling molecules and cerium coatings on the AA3003 alloy corrosion resistance

Author(s)

Banczek, E. P. ^[1] ; Moraes, S. R. ^[2] ; Assis, S. L. ^[1] ; Costa, I. ^[1] ; Motheo, A. J. ^[2]

Affiliation

^[1] IPEN CNEN SP, Ctr Ciencias & Tecnol Mat, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Carlos, SP - Brazil

• Document type: Journal article
• Source: MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION; v. 64, n. 3, p. 199-206, MAR 2013.
• Web of Science Citations: 7

Abstract

This work presents the effects of a cerium conversion coating, self-assembling molecules (SAM) treatment, and a combination of these two treatments on the corrosion resistance of the AA3003 alloy. The results were compared to that of a conversion coating treatment with hexavalent chromium (Cr VI). The corrosion resistance of the surface-treated AA3003 alloy samples was investigated by electrochemical impedance spectroscopy and anodic polarization curves in 0.5mol/L sodium sulfate solution with pH adjusted to 4.0. The results showed that the SAM treatment offered better corrosion protection for the AA3003 alloy than that provided by cerium conversion coating. The combination of cerium conversion and SAM treatments improved the corrosion resistance of the AA3003 alloy due to SAM adsorption on the alloy substrate exposed at the defects in the cerium conversion layer. (AU)

• FAPESP's process: 05/04641-4 - Combination of cerium and polyaniline conversion layers on aluminum alloys as a corrosion-resistant coating
• Grantee: Sandra Regina de Moraes
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 04/12189-1 - Corrosion protection methods for aluminum alloys
• Grantee: Artur de Jesus Motheo
• Support Opportunities: Research Projects - Thematic Grants