Fabrication of Vanadate-Exchanged Electrodeposited Zn-Al Layered Double Hydroxide (LDH) Coating on a ZX21 Mg Alloy to Improve the Corrosion Resistance
Abstract
:1. Introduction
2. Materials and Methods
2.1. Fabrications of the Zn-Al LDH Coatings
2.1.1. Electrodeposition of the Zn-Al LDH Coating
2.1.2. Vanadate-Exchange of the Electrodeposited Zn-Al LDH Coating
2.2. Microstructure Characterizations of the Zn-Al LDH Coatings
2.3. Corrosion and Electrochemical Measurements
2.3.1. Electrochemical Measurements
2.3.2. Artificial Scratch Tests
3. Results
3.1. Microstructure Characterizations of the Zn-Al LDH Coatings
3.2. Electrochemical Measurements
3.2.1. Potentiodynamic Polarization Curves
3.2.2. Electrochemical Impedance Spectroscopy (EIS) Measurements
3.3. Artificial Scratch Tests
4. Discussion
4.1. Microstructure of the Fabricated Zn-Al LDH Coatings
4.2. Corrosion Inhibition of the Vanadate-Exchanged Electrodeposited Zn-Al LDH Coating
5. Conclusions
- The fabricated vanadate-exchanged electrodeposited Zn-Al-VOx LDH coating contains complex ions in the interlayers, mainly NO3−, CO32−, and different vanadates (dominated by VO3(OH)2− and V2O74−). The vanadates in the interlayers play important roles in the corrosion inhibition of the ZX21 Mg alloy.
- The corrosion current density of the ZX21 Mg alloy decreases from 62.4 μA/cm2 to 3.32 μA/cm2 with the vanadate-exchanged electrodeposited Zn-Al-VOx LDH coating. The Zn-Al-VOx LDH coating not only serves as a physical barrier but also absorbs Cl− ions in the environment and inhibits corrosion with the reduction of the interlayer vanadates. Furthermore, the vanadates in the LDH coating can also be released to the damaged area of the coating.
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Item | (003) Diffraction Peak Position (2θ) | FWHM |
---|---|---|
Zn-Al-NO3 LDHs | 11.52° | 0.876° |
Zn-Al-VOx LDHs | 11.42° | 0.943° |
Item | Ecorr (V vs. SCE) | βc (mV/dec) | icorr (μA/cm2) |
---|---|---|---|
Zn-Al-VOx LDHs | −1.647 | −230 | 3.32 |
Zn-Al-NO3 LDHs | −1.670 | −239 | 18.4 |
ZX21 Mg Alloy | −1.664 | −250 | 62.4 |
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Hsiao, W.-L.; Chu, P.-W. Fabrication of Vanadate-Exchanged Electrodeposited Zn-Al Layered Double Hydroxide (LDH) Coating on a ZX21 Mg Alloy to Improve the Corrosion Resistance. Coatings 2024, 14, 1047. https://doi.org/10.3390/coatings14081047
Hsiao W-L, Chu P-W. Fabrication of Vanadate-Exchanged Electrodeposited Zn-Al Layered Double Hydroxide (LDH) Coating on a ZX21 Mg Alloy to Improve the Corrosion Resistance. Coatings. 2024; 14(8):1047. https://doi.org/10.3390/coatings14081047
Chicago/Turabian StyleHsiao, Wei-Lun, and Peng-Wei Chu. 2024. "Fabrication of Vanadate-Exchanged Electrodeposited Zn-Al Layered Double Hydroxide (LDH) Coating on a ZX21 Mg Alloy to Improve the Corrosion Resistance" Coatings 14, no. 8: 1047. https://doi.org/10.3390/coatings14081047