The Effect of Pore Sealing in a Multilayer Si–O–Zr/Al2O3 Coating Designed to Protect Aluminium from Corrosion
Abstract
:1. Introduction
2. Materials and Methods
2.1. Aluminium Substrate
2.2. Coating/Film Deposition
2.2.1. Hybrid Sol–Gel Coating
2.2.2. Atomic Layer Deposition of the ALD Al2O3 Film
2.2.3. Multilayer TMZ/Al2O3 System
2.3. Coating Characterisation
2.3.1. Composition Characterisation
2.3.2. Surface and Cross-Section Analysis
2.3.3. Electrochemical Corrosion Testing
3. Results and Discussion
3.1. Preparation and Analysis of the TMZ Sol–Gel
3.1.1. Real-Time FTIR Analysis of the Sol–Gel TMZ Solution
→ Zr(OCH2CH2CH3)3OOCCH3C=CH2 + CH3CH2CH2OH
3.1.2. FTIR Analysis of the Sol–Gel TMZ Coating
3.2. Preparation and Analysis of the ALD Al2O3 Film
FTIR Analysis of the Ground Al and Al Coated with the Al2O3 ALD Film
3.3. Preparation and Analysis of the Multilayer TMZ/Al2O3
3.3.1. Surface and Cross-Section Analysis
3.3.2. Electrochemical Corrosion Testing
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Coating | Precursors | Preparation | Coating Deposition | Thickness |
---|---|---|---|---|
TMZ sol–gel | MAPTMS, TEOS, ZTP and MAA | Synthesis at room temperature. | Spin-coating. | 3.8 µm |
Al2O3-ALD | TMA, H2O | Deposition in vacuum at 150 °C. | Layer-by-layer deposition. | 100 nm |
Chemical Bonds | Wavenumber [cm−1] |
---|---|
Si–O–R (MAPTMS or TEOS) | 1164, 1081, 815, 785 |
Si–OH | 942 |
Si–O–Si | 1084, 1027 |
Zr–O–R (ZTP) | 1555, 1376, 1459, 1130, 1044, 1003, 890, 834 |
MAA | 1691, 1634, 1455, 1428, 1298, 1203, 810 |
ZTP/MAA | 1646, 1055, 1248, 834 |
Si–O–Zr (TMZ) | 1014, 1031, 943, 969 |
Sample | Immersion Time | |Z|10 mHz [MΩ cm2] |
---|---|---|
Ground Al | 1 h | 0.016 |
Al coated with TMZ | 1 h | 25.5 |
1 day | 15.4 | |
1 week | 6.1 | |
2 weeks | 4.1 | |
3 weeks | 2.5 | |
4 weeks | 0.54 | |
Al coated with ALD | 1 h | 80.4 |
1 day | 78.5 | |
1 week | 11.1 | |
2 weeks | 0.23 | |
Al coated TMZ+ALD | 1 h | 827.2 |
1 day | 580.9 | |
1 week | 280.2 | |
2 weeks | 124.8 | |
3 weeks | 31.9 | |
4 weeks | 5.0 |
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Rodič, P.; Kapun, B.; Milošev, I. The Effect of Pore Sealing in a Multilayer Si–O–Zr/Al2O3 Coating Designed to Protect Aluminium from Corrosion. Metals 2023, 13, 1960. https://doi.org/10.3390/met13121960
Rodič P, Kapun B, Milošev I. The Effect of Pore Sealing in a Multilayer Si–O–Zr/Al2O3 Coating Designed to Protect Aluminium from Corrosion. Metals. 2023; 13(12):1960. https://doi.org/10.3390/met13121960
Chicago/Turabian StyleRodič, Peter, Barbara Kapun, and Ingrid Milošev. 2023. "The Effect of Pore Sealing in a Multilayer Si–O–Zr/Al2O3 Coating Designed to Protect Aluminium from Corrosion" Metals 13, no. 12: 1960. https://doi.org/10.3390/met13121960