Effect of the microstructure of high strength Al alloys on formation and corrosion resistance of the anodized layer

• Grant number: 19/18388-1
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: January 01, 2020
• End date: December 31, 2024
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Isolda Costa
• Grantee: João Victor de Sousa Araujo
• Host Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil
• Associated scholarship(s): 22/06935-0 - Characterization of the microstructure of the anodized layer in Al alloys using high magnification and spatial resolution techniques, BE.EP.DR

Abstract

Anodizing of high strength Al-Cu-Li alloys is of great interest for the aerospace industry since it uses these alloys in the aircraft structure. This research aims to study the influence of the microstructure of the 2198-T8 and 2198-T851 Al-Cu-Li alloys on the anodized layer formed in sulfuric tartaric acid solution and the effect of this layer on the corrosion resistance of these alloys. For this purpose, microstructure characterization will be carried out by means of techniques such as: Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM) and Scanning Kelvin Probe Force Microscopy (SKPFM). The electrochemical characterization will be performed by potentiostatic and potentiodynamic polarization curves, in order to understand the different processes that occur during the anodization process of these alloys. The alloys will be anodized in sulfuric tartaric solution (TSA) and the microstructural characterization will be performed after this step. Mechanisms will be proposed related to the dissolution of the intermetallic phases during the anodizing process. Potentiodynamic curves will be used to identity the phase dissolution potentials. Also, the effect of different potentials applied on the alloy microstructure will be investigated and the potentials applied will be chosen by analysis of the potentiostatic polarization curves. The progress of this study will contribute to the development of new methods of anodizing of Al-Cu-Li alloys used for the aircraft structures. (AU)

Scientific publications

(10)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE SOUSA ARAUJO, JOAO V.; MILAGRE, MARIANA X.; FERREIRA, RAPHAEL O.; DE SOUZA CARVALHO MACHADO, CARULINE; DE FATIMA SANTOS BUGARIN, ALINE; MACHADO, IZABEL F.; COSTA, ISOLDA. Exfoliation and intergranular corrosion resistance of the 2198 Al-Cu-Li alloy with different thermomechanical treatments. MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION, v. 71, n. 12, p. 1957-1970, DEC 2020. (13/13235-6, 19/18388-1)

DE SOUSA ARAUJO, JOAO VICTOR; MILAGRE, MARIANA XAVIER; FERREIRA, RAPHAEL OLIVEIRA; DE SOUZA CARVALHO MACHADO, CARULINE; DE ABREU, CAIO PALUMBO; COSTA, ISOLDA. Microstructural Characteristics of the Al Alloys: The Dissimilarities Among the 2XXX Alloys Series used in Aircraft Structures. METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS, v. 9, n. 5, p. 15-pg., 2020-10-15. (19/18388-1, 13/13235-6)

JOÃO VICTOR DE SOUSA ARAUJO; REJANE MARIA PEREIRA DA SILVA; UYIME DONATUS; CARULINE DE SOUZA CARVALHO MACHADO; ISOLDA COSTA. Microstructural, Electrochemical and Localized Corrosion Characterization of the AA2198-T851 Alloy. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 23, n. 4, 2020-09-14. (19/18388-1, 16/20572-7, 18/06880-6)

ARAUJO, JOAO VICTOR DE SOUSA; MILAGRE, MARIANA XAVIER; ZHOU, XIAORONG; COSTA, ISOLDA. An assessment of pitting corrosion in anodized aluminum alloys: It might not be what it seems. MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION, v. 75, n. 5, p. 15-pg., 2024-01-03. (19/18388-1, 22/06935-0)

ARAUJO, JOAO VICTOR DE SOUSA; MILAGRE, MARIANA; COSTA, ISOLDA. A historical, statistical and electrochemical approach on the effect of microstructure in the anodizing of Al alloys: a review. CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES, v. N/A, p. 61-pg., 2023-06-30. (22/06935-0, 19/18388-1)

REJANE MARIA P. DA SILVA; MARIANA X. MILAGRE; JOÃO VICTOR DE S. ARAUJO; OSCAR MAURICIO P. RAMIREZ; CARULINE DE SOUZA C. MACHADO; RENATO A. ANTUNES; ISOLDA COSTA. Investigação da atividade eletroquímica de liga Al-Cu-Li após processo de soldagem por fricção e mistura. Química Nova, v. 46, n. 4, p. 307-318, 2023-05-29. (19/18388-1, 13/13235-6, 18/06880-6)

CARVALHO MACHADO, CARULINE DE SOUZA; DONATUS, UYIME; MILAGRE, MARIANA XAVIER; ARAUJO, JOAO VICTOR DE S.; DE VIVEIROS, BARBARA VICTORIA G.; KLUMPP, RAFAEL EMIL; PEREIRA, VICTOR FERRINHO; COSTA, ISOLDA. How microstructure affects localized corrosion resistance of stir zone of the AA2198-T8 alloy after friction stir welding. MATERIALS CHARACTERIZATION, v. 174, APR 2021. (19/18388-1, 17/03095-3)

JOÃO VICTOR DE SOUSA ARAUJO; REJANE MARIA PEREIRA DA SILVA; MARIANA XAVIER MILAGRE; CARULINE DE SOUZA CARVALHO MACHADO; ISOLDA COSTA. MECANISMO DE EVOLUÇÃO DE HIDROGÊNIO DURANTE A CORROSÃO DA LIGA 2198-T8 EM MEIO CONTENDO CLORETO: UMA ABORDAGEM ELETROQUÍMICA. Química Nova, v. 43, n. 8, p. 1058-1065, 2020-10-16. (18/06880-6, 19/18388-1)

DE SOUSA ARAUJO, JOAO VICTOR; MILAGRE, MARIANA XAVIER; KLUMPP, RAFAEL EMIL; AYUSSO, VICTOR HUGO; DONATUS, UYIME; COSTA, ISOLDA. TSA anodising voltage effects on the near-surface coarse intermetallic particles in the AA2024-T3 and AA2198-T8 alloys. CORROSION ENGINEERING SCIENCE AND TECHNOLOGY, v. 57, n. 4, p. 17-pg., 2022-05-06. (21/12959-7, 19/18388-1)

KLUMPP, RAFAEL EMIL; AKBARZADEH, SAJJAD; DE SOUSA ARAUJO, JOAO VICTOR; GONON, MAURICE FRANCOIS; DELAUNOIS, FABIENNE; COSTA, ISOLDA; OLIVIER, MARIE-GEORGES. Correlating corrosion modes with the microstructure of the 2XXX series alloys: A comparative approach. SURFACE AND INTERFACE ANALYSIS, v. 56, n. 9, p. 11-pg., 2024-05-23. (19/18388-1)