Effect of Cerium Addition to a Hydrothermal Treatment on the Corrosion Protection of the Tartaric-Sulfuric Acid Anodized AA2524-T3

Author(s)

Terada, Maysa ^{[1, 2]} ; Queiroz, Fernanda M. ^{[1, 3]} ; Costenaro, Helen ^[1] ; Ayusso, Victor H. ^[2] ; Olivier, Marjorie ^[4] ; Costa, Isolda ^[2] ; de Melo, Hercilio G. ^[1]

Affiliation

^[1] Univ Sao Paulo, Polytech Sch, Av Prof Mello Moraes 2463, BR-05508030 Sao Paulo, SP - Brazil

^[2] Nucl & Energy Res Inst, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil

^[3] Escola & Fac Tecnol SENAI Suico Brasileira Paulo, Rua Bento Branco Andrade Filho 379, BR-04757000 Sao Paulo, SP - Brazil

^[4] Univ Mons, Fac Engn, 20 Pl Parc, Mons - Belgium

• Document type: Journal article
• Source: CORROSION; v. 75, n. 9, p. 1110-1117, SEP 2019.
• Web of Science Citations: 0

Abstract

To protect Al alloys from corrosion, standard procedures in the aerospace industry use chromium-based acid anodizing with subsequent post-treatment steps also containing hexavalent chromium (Cr(VI)) ions. However, environmental and health related concerns associated with Cr(VI) have encouraged the search for new surface treatments providing effective corrosion protection without the drawback of generating toxic residues. In this investigation, a hydrothermal treatment in aqueous solution with cerium ions is proposed as a post-treatment for tartaric-sulfuric acid (TSA) anodizing, and its effects on the AA2524-T3 alloy corrosion resistance investigated. The effect of Ce on the characteristics of the surface film formed, such as morphology and corrosion resistance, is investigated by scanning electron microscopy and electrochemical impedance spectroscopy (EIS). The results show that the hydrothermal treatment in solution containing Ce(III) ions presents a less stable behavior than the treatment in boiling water. However, the results of the EIS experiments show recovery of the protective properties of the system, indicating that some self-healing properties must be imparted to the system. (AU)

• FAPESP's process: 13/13235-6 - Investigation on the localized corrosion and the fatigue corrosion resistance of high strength aluminum alloys joined by friction stir welding (FSW)
• Grantee: Isolda Costa
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/01096-5 - Corrosion study of the alloy AA2024-T3 anodized in TSA and protected with Ce ions and an hybrid sol-gel coating
• Grantee: Hercílio Gomes de Melo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/20572-7 - Using localized electrochemical impedance spectroscopy (LEIS) for corrosion of high mechanical strength aluminum alloys welded by FSW
• Grantee: Fernanda Martins Queiroz
• Support Opportunities: Scholarships in Brazil - Post-Doctoral