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Alsuhybani MS, Alsaloum HK, Alsalman AS, Aldawsari AM, Aljohani TA. Study of the Synergistic Influence of Plasma Electrolytic Oxidation and Wet Post-Treatment on the Surface of AA7075. ACS APPLIED BIO MATERIALS 2024; 7:5965-5976. [PMID: 39194162 DOI: 10.1021/acsabm.4c00528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
In this study, we enhanced the corrosion and microbial resistance of aluminum 7075 alloys by applying a thin layer of alumina through plasma electrolytic oxidation (PEO) in an alkali-silicate electrolyte. In addition, the influence of film sealing on coated aluminum alloy 7075 was studied in detail, specifically in oil and water at 100 °C after treatment. The surface and cross-sectional morphology, element composition, and phase composition of the PEO coatings were characterized by using scanning electron microscopy (SEM) assisted with energy-dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD), respectively. The corrosion resistance of the coating on AA7075 PEO was evaluated before and after post-treatment using hot water and hump oil at 100 °C. This assessment was conducted by using various electrochemical techniques, including open-circuit potential (OCP), linear polarization resistance (LPR), potentiodynamic polarization scan (PD), electrochemical impedance spectroscopy (EIS), and cyclic potentiodynamic scan (CPS). The results showed that the corrosion resistance of the AA7075 alloy was significantly improved after the PEO coating. The AA7075 + SF, among all of the examined alloys, exhibited superior corrosion properties, due to its fat sealing. This is probably due to the formation of a mixed fatty acid layer from oil on the surface of the AA7075 PEO, which synthesizes a hydrophobic layer. Interestingly, the samples treated with PEO showed a great resistance to microbial growth.
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Affiliation(s)
| | - Hessa K Alsaloum
- Tamaheer Program, Saudi Human Resources Development Fund, Riyadh 12213, Saudi Arabia
| | - Abdullah S Alsalman
- King Abdulaziz City for Science and Technology (KACST), Riyadh 12354, Saudi Arabia
| | - Alanoud M Aldawsari
- Tamaheer Program, Saudi Human Resources Development Fund, Riyadh 12213, Saudi Arabia
| | - Talal A Aljohani
- Refining and Petrochemicals Research Institute, King Abdulaziz City for Science and Technology (KACST), Riyadh 12354, Saudi Arabia
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Ruiz-Garcia A, Esquivel-Peña V, Genescá J, Montoya R. Advances in galvanic corrosion of aluminum alloys. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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The anomalous alkalinization of the electrolyte during a slight anodic polarization of Mg: A different perspective. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.141969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Zavalis TG, Ström M, Persson D, Wendel E, Ahlström J, Törne KB, Taxén C, Rendahl B, Voltaire J, Eriksson K, Thierry D, Tidblad J. Mechanistic Model with Empirical Pitting Onset Approach for Detailed and Efficient Virtual Analysis of Atmospheric Bimetallic Corrosion. MATERIALS (BASEL, SWITZERLAND) 2023; 16:923. [PMID: 36769928 PMCID: PMC9917702 DOI: 10.3390/ma16030923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
A mechanistic model of atmospheric bimetallic corrosion with a simplified empirical approach to the onset of localized corrosion attacks is presented. The model was built for a typical bimetallic sample containing aluminum alloy 1050 and stainless steel 316L sheets. A strategy was developed that allowed the model to be calibrated against the measured galvanic current, geometrical corrosion attack properties, and corrosion products. The pitting-onset simplification sets all pits to be formed at a position near the nobler metal and treated all pits as being of the same shape and size. The position was based on the location of the highest pitting events and the pit attributes on an average of the deepest pits. For 5 h exposure at controlled RH (85%, 91%, and 97%) and salt load (86 μg NaCl/cm2), the model was shown to be promising: both for analysis of local bimetallic corrosion chemistry, such as pH and corrosion products, and for efficient assessment of pitting damage by computing a single largest pit depth. Parametric studies indicated that the pitting-onset approximation deviated the most at the beginning of exposure and when RH was below 91%.
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Affiliation(s)
- Tommy G. Zavalis
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Mats Ström
- Volvo Car Corporation, 40531 Göteborg, Sweden
| | - Dan Persson
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Erik Wendel
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Johan Ahlström
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Karin Beaussant Törne
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Claes Taxén
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Bo Rendahl
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | | | | | - Dominique Thierry
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
| | - Johan Tidblad
- RISE Research Institutes of Sweden, Division Materials and Production, Department Corrosion, 16407 Kista, Sweden
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Vega J, García-Lecina E, Genesca J, Montoya R. The AA2024/CFRP galvanic couple under a dynamic electrolyte drop: modeling and experimental. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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