| Naslov: | Influence of surface pretreatments on composition, structure and corrosion performance of zirconium conversion coating applied to AA7075-T6 |
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| Avtorji: | ID Šekularac, Gavrilo, Institut "Jožef Stefan" (Avtor)
ID Kovač, Janez, Institut "Jožef Stefan" (Avtor)
ID Milošev, Ingrid, Institut "Jožef Stefan" (Avtor) |
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| Datoteke: |  URL - Izvorni URL, za dostop obiščite https://iopscience.iop.org/article/10.1149/1945-7111/ae18fd
 PDF - Predstavitvena datoteka, prenos (6,52 MB)
MD5: 63BCD871AD4DE25F6009E0F5DEB2453C
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| Jezik: | Angleški jezik |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: |  IJS - Institut Jožef Stefan
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| Povzetek: | The effect of chemical pretreatment of aluminium alloy 7075-T6 on the composition, morphology, and structure of zirconium conversion coatings (ZrCC) was investigated. Chemical pretreatments included: (i) alkaline etching and desmutting using commercial reagents, (ii) alkaline etching using sodium hydroxide, (iii) acidic etching using nitric acid, (iv) desmutting using a commercial reagent and boiling in deionised water, and (v) alkaline etching and desmutting using nitric acid. ZrCCs were deposited at room temperature from a 200 ppm H2ZrF6 solution of pH 4.8. A commercial SurTec® coating containing zirconium and trivalent chromium was used as a benchmark. The electrochemical behaviour was evaluated using potentiodynamic polarisation measurements and electrochemical impedance spectroscopy conducted over a minimum of 5 days and up to 15 days in 0.1 M NaCl. Corrosion resistance was further assessed through immersion testing. Microstructural characterisation was performed using scanning electron microscopy with energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, and time-of-flight secondary ion mass spectrometry. The SurTec® pretreatment of AA7075-T6 activated the self-sealing of the subsequently deposited ZrCC, about 40 nm thick, which exhibited the highest degree of compactness and uniformity. This study showed a significant impact of surface chemical pretreatment on the microstructural and protective properties of ZrCCs deposited on 7075 alloy. |
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| Ključne besede: | surface pretreatment, etching, desmutting |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Poslano v recenzijo: | 20.08.2025 |
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| Datum sprejetja članka: | 28.10.2025 |
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| Datum objave: | 10.11.2025 |
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| Založnik: | IOP Publishing |
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| Leto izida: | 2025 |
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| Št. strani: | str. [1-24] |
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| Številčenje: | Vol. 172, no. 11, [article no.] 111501 |
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| Izvor: | Združeno kraljestvo |
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| PID: | 20.500.12556/DiRROS-24177  |
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| UDK: | 546 |
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| ISSN pri članku: | 1945-7111 |
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| DOI: | 10.1149/1945-7111/ae18fd |
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| COBISS.SI-ID: | 257239811 |
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| Avtorske pravice: | © 2025 The Author(s). |
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| Opomba: | Nasl. z nasl. zaslona;
Opis vira z dne 14. 11. 2025;
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| Datum objave v DiRROS: | 18.11.2025 |
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| Število ogledov: | 143 |
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| Število prenosov: | 58 |
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| Metapodatki: |    |
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