Enhanced Corrosion Resistance of Layered Double Hydroxide Films on Mg Alloy: The Key Role of Cationic Surfactant
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Chemicals
2.2. In Situ Fabrications of MgAl-LDH-TTABx g and MgAl-CO32−-LDH Films
2.3. Characterization
2.4. Electrochemical Tests
3. Results and Discussion
3.1. Characterization of MgAl-CO32−-LDH and MgAl-LDH-TTAB Powders by XRD, FTIR and SEM
3.2. Characterizations of MgAl-CO32−-LDH and MgAl-LDH-TTABx g Films by SEM, EDS, Mapping, and XPS
3.3. Adhesion Test of MgAl-LDH-TTAB Films
3.4. Corrosion Behaviour of the Studied Samples Determined by PDP
3.5. Corrosion Behaviour of the Studied Samples Determined by EIS
3.6. Corrosion Inhibition Mechanism
4. Conclusions
- (1)
- MgAl-LDH-TTAB was successfully synthesized in the presence of TTAB, and TTAB was unable to penetrate the LDH layers.
- (2)
- MgAl-LDH-TTAB powders having an average particle size of 100–200 nm were found to be more homogeneous and smaller in particle size than MgAl-CO32−-LDH powders.
- (3)
- MgAl-LDH-TTAB films with compact structure, uniform distribution, and superior mechanical adhesion could provide excellent physical shielding from corrosive media. Therefore, MgAl-LDH-TTAB films protected the AZ31 substrate more effectively than the MgAl-CO32−-LDH film. The icorr of the MgAl-LDH-TTAB film was decreased to 1 × 10−8 A cm−2.
- (4)
- The concentration of TTAB had a significant impact on the morphology and corrosion resistance of LDHs films. With the increase of TTAB concentration, the outer layer LDH films became denser and provided better corrosion resistance for the MgAl-LDH-TTAB films.
- (5)
- After being immersed in 3.5 wt.% NaCl solution for 168 h, the |Z|f = 0.05 Hz values of the AZ31 substrate coated with MgAl-LDH-TTAB0.35 g film still remained at 105 Ω·cm2, implying the good long-term corrosion resistance of MgAl-LDH-TTABx g films.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample | Difference | |
---|---|---|
MgAl-CO32−-LDH | obtained from NaOH, Na2CO3, magnesium nitrate, and aluminum nitrate | |
MgAl-LDH-TTAB0.025 g | obtained from NaOH, TTAB, magnesium nitrate, and aluminum nitrate in the N2 environment | 0.025 g TTAB |
MgAl-LDH-TTAB0.05 g | 0.05 g TTAB | |
MgAl-LDH-TTAB0.1 g | 0.1 g TTAB | |
MgAl-LDH-TTAB0.2 g | 0.2 g TTAB | |
MgAl-LDH-TTAB0.35 g | 0.35 g TTAB |
Sample | Ecorr (V/SCE) | icorr (A·cm−2) |
---|---|---|
MgAl-CO32−-LDH | −1.52 | 1.29 × 10−5 |
MgAl-LDH-TTAB0.025 g | −1.23 | 4.26 × 10−8 |
MgAl-LDH-TTAB0.05 g | −1.02 | 3.74 × 10−8 |
MgAl-LDH-TTAB0.1 g | −0.98 | 2.66 × 10−8 |
MgAl-LDH-TTAB0.2 g | −0.93 | 1.54 × 10−8 |
MgAl-LDH-TTAB0.35 g | −0.92 | 1.09 × 10−8 |
Sample | Ecorr (V/SCE) | icorr (A·cm−2) | Reference |
---|---|---|---|
MgAl-LDH-TTAB0.35 g | −0.92 | 1.09 × 10−8 | This study |
MgAl-WO42−-LDHs | −1.26 | 7.44 × 10−6 | [48] |
MgAl−8HQ-LDHs | −0.77 | 1.70 × 10−7 | [16] |
MgAl-ASP-LDHs | 0.12 | 2.24 × 10−8 | [12] |
MgAl-PPA-LDHs | −1.16 | 2.47 × 10−9 | [17] |
MgAl-NO3−-LDHs | −1.53 | 3.10 × 10−7 | [40] |
ZnAl-La-LDHs | −1.07 | 2.77 × 10−7 | [49] |
ZnAl-ASP-LDHs | −1.50 | 3.93 × 10−7 | [49] |
ZnAl-MoO42−-LDHs | −0.98 | 3.42 × 10−6 | [49] |
ZnAl-VO43−-LDHs | −0.88 | 3.03 × 10−7 | [49] |
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Yang, Q.; Tabish, M.; Wang, J.; Zhao, J. Enhanced Corrosion Resistance of Layered Double Hydroxide Films on Mg Alloy: The Key Role of Cationic Surfactant. Materials 2022, 15, 2028. https://doi.org/10.3390/ma15062028
Yang Q, Tabish M, Wang J, Zhao J. Enhanced Corrosion Resistance of Layered Double Hydroxide Films on Mg Alloy: The Key Role of Cationic Surfactant. Materials. 2022; 15(6):2028. https://doi.org/10.3390/ma15062028
Chicago/Turabian StyleYang, Qiuxiang, Mohammad Tabish, Jingbao Wang, and Jingmao Zhao. 2022. "Enhanced Corrosion Resistance of Layered Double Hydroxide Films on Mg Alloy: The Key Role of Cationic Surfactant" Materials 15, no. 6: 2028. https://doi.org/10.3390/ma15062028