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Gad SM, Jin Z, Emad S, Vergara JE, Yawas DS, Dagwa IM, Momoh-Bello Omiogbemi I. Potential of rare-earth compounds as anticorrosion pigment for protection of aerospace AA2198-T851 alloy. Heliyon 2023; 9:e14693. [PMID: 37101480 PMCID: PMC10123218 DOI: 10.1016/j.heliyon.2023.e14693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 03/11/2023] [Accepted: 03/15/2023] [Indexed: 03/28/2023] Open
Abstract
In this study, the anticorrosion potential of carboxylic compounds; Lanthanum 4-hydroxycinnamate La(4OHCin)3, Cerium 4-hydroxycinnamate Ce(4OHCin)3 and Praseodymium 4-hydroxycinnamate Pr(4OHCin)3 for the protection of Al-Cu-Li alloy was investigated in 3.5% NaCl solution using electrochemical tests (EIS and PDP), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The findings achieved show a very good correlation between electrochemical responses and surface morphologies of the exposed alloy, indicating a modification of the surface by precipitation of the inhibitor species, leading to effective protection against corrosion. At optimum concentration 200 ppm, the trend of inhibition efficiency η (%) increases in the order Ce(4OHCin)3 93.35% > Pr(4OHCin)3 85.34% > La(4OHCin)3 82.25%. XPS complemented the findings by detecting and providing information about the oxidation states of the protective species.
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Affiliation(s)
- Shedrack Musa Gad
- Corrosion and Protection Centre, School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
- Corresponding author.
| | - Zelong Jin
- Corrosion and Protection Centre, School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Seydgholamreza Emad
- Corrosion and Protection Centre, School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | | | - Danjuma Saleh Yawas
- Shell Professorial Chair, Mechanical Engineering Department, Ahmadu Bello University, Samaru Campus, Community Market, 810211, Zaria, Nigeria
| | - Ishaya Musa Dagwa
- Department of Mechanical Engineering, University of Abuja, Main Campus, Airport Road, P.M.B. 117 Abuja, Nigeria
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Glenn AM, Hughes AE, MacRae CM, Wilson NC, Torpy A, Zhou X. Observations on the Early Stages of Corrosion on AA2099-T83. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2020; 26:821-836. [PMID: 32513338 DOI: 10.1017/s1431927620001634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
An Al–Cu–Li aerospace alloy has been investigated to determine the order in which corrosion at different types of sites occurs in AA2099-T83. Specifically, the sequence of galvanic attack on intermetallic (IM) particles and other sites of AA2099-T83 was determined as a function of time, in 0.1 M NaCl, through the use of scanning electron microscopy and electron backscatter diffraction characterization techniques. The earliest attack occurred at isolated grains and grain boundaries and on Li-containing dispersoids. Similarly, some constituent IM particles showed evidence of trenching in the surrounding alloy matrix. These IM particles included Al7Cu2Fe and another group of unidentified particles which displayed complete trenching within the first 10 min of exposure. Al13(Fe, Mn)4 were next most active followed by Al37Fe12Cu2 with Al6(Fe,Mn) and large TiB2 particles being the least active.
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Affiliation(s)
- A Matthew Glenn
- CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
| | - Anthony E Hughes
- CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
- Institute of Frontier Materials, Deakin University, 221 Burwood Highway, Burwood, VIC 3125, Australia
| | - Colin M MacRae
- CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
| | | | - Aaron Torpy
- CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
| | - Xiaorong Zhou
- Corrosion and Protection Centre, School of Materials, The University of Manchester, ManchesterM13 9PL, UK
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The Influence of Stored Energy on Grain Boundary Chemistry and Intergranular Corrosion Development in AA2024-T3 Alloy. MATERIALS 2018; 11:ma11112299. [PMID: 30453489 PMCID: PMC6265874 DOI: 10.3390/ma11112299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 11/10/2018] [Accepted: 11/14/2018] [Indexed: 11/17/2022]
Abstract
Following our previous research, the correlation between the micro-chemistry of grain boundary and the distribution of stored energy in AA2024-T3 alloy is investigated, using the combination of transmission Kikuchi diffraction and transmission electron microscopy. It is found that the difference of dislocation density, namely stored energy, between two neighboring grains significantly affects the micro-chemistry of the grain boundary. Further, it is revealed that intergranular corrosion development in the AA2024-T3 alloy is mainly attributed to the combined effect of grain boundary chemistry and stored energy distribution.
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