| Title: | Influence of surface pretreatments on composition, structure and corrosion performance of zirconium conversion coating applied to AA7075-T6 |
|---|
| Authors: | ID Šekularac, Gavrilo, Institut "Jožef Stefan" (Author)
ID Kovač, Janez, Institut "Jožef Stefan" (Author)
ID Milošev, Ingrid, Institut "Jožef Stefan" (Author) |
|---|
| Files: |  URL - Source URL, visit https://iopscience.iop.org/article/10.1149/1945-7111/ae18fd
 PDF - Presentation file, download (6,52 MB)
MD5: 63BCD871AD4DE25F6009E0F5DEB2453C
|
|---|
| Language: | English |
|---|
| Typology: | 1.01 - Original Scientific Article |
|---|
| Organization: |  IJS - Jožef Stefan Institute
|
|---|
| Abstract: | 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. |
|---|
| Keywords: | surface pretreatment, etching, desmutting |
|---|
| Publication status: | Published |
|---|
| Publication version: | Version of Record |
|---|
| Submitted for review: | 20.08.2025 |
|---|
| Article acceptance date: | 28.10.2025 |
|---|
| Publication date: | 10.11.2025 |
|---|
| Publisher: | IOP Publishing |
|---|
| Year of publishing: | 2025 |
|---|
| Number of pages: | str. [1-24] |
|---|
| Numbering: | Vol. 172, no. 11, [article no.] 111501 |
|---|
| Source: | Združeno kraljestvo |
|---|
| PID: | 20.500.12556/DiRROS-24177  |
|---|
| UDC: | 546 |
|---|
| ISSN on article: | 1945-7111 |
|---|
| DOI: | 10.1149/1945-7111/ae18fd |
|---|
| COBISS.SI-ID: | 257239811 |
|---|
| Copyright: | © 2025 The Author(s). |
|---|
| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 14. 11. 2025;
|
|---|
| Publication date in DiRROS: | 18.11.2025 |
|---|
| Views: | 145 |
|---|
| Downloads: | 60 |
|---|
| Metadata: |    |
|---|
|
:
|
Copy citation |
|---|
| | | | Share: |  |
|---|
Hover the mouse pointer over a document title to show the abstract or click
on the title to get all document metadata. |
