Evaluation of Tannins as Potential Green Corrosion Inhibitors of Aluminium Alloy Used in Aeronautical Industry
(This article belongs to the Section Corrosion and Protection)
Abstract
:1. Introduction
- (a)
- electrostatic attraction between the organic molecules and the metal;
- (b)
- interaction of oxygen lone electron pairs with the metal;
- (c)
- interaction of tannin molecule π-electrons with the metal;
- (d)
- combination of (a) and (c).
2. Materials and Methods
2.1. Sample Preparation
2.2. UV-Vis Spectra
2.3. Electrochemical Measurements
2.4. FTIR Spectroscopy
2.5. Scanning Electron Microscopy (SEM)
3. Results and Discussion
3.1. Morphology Analysis
3.2. Coating Characterization
SA | GSA | TNSA | CSA | MSA | Assignments | References |
---|---|---|---|---|---|---|
3815 vs | 3990 vs | 3963 vs | νas O-H | [40] | ||
3414 vs 3037 vs | 3400 vs 3062 vs | 3531 vs | 3446 vs | 3427 vs | νO-H streching | [40,50,52] |
1635 vs | 1637 m | 1624 s | νO-H (H2O) and νsCOO− | [16,40] | ||
1552 s 1464 s | 1577 s 1475 s | 1543 s | νasCOO− | [16,40] | ||
1132 m | 1132 s | 1134 m | ν C-O-C cyclic ether | [40,42,51,52,53,54] | ||
980 s | 980 s | 980 s | 980 s | 980 s | νas AlO4 and δAlO4 | [40,42,51,52,53,54] |
629 vw | 633 vw | 638 w | 629 w | 623 w | νas AlO4 | [40,42,51,52,53,54] |
561 s | 560 w | 559 w | 561 w | 530 w | νas AlO6 | [40,42,51,52,53,54] |
SA | GSA | TNSA | CSA | MSA | Assignments | References |
---|---|---|---|---|---|---|
3984 vs | 3813 vs | 3826 vs | 3840 vs | νas O-H | [40] | |
3695 vs | νs O-H | [40,51] | ||||
3325 vs | 3495 vs 3174 vs | 3537 vs 3089 vs | 3485 vs | 3477 vs 3190 vs | νO-H streching | [40,51] |
1635 w | 1635 m | 1635 s | 1633 w | 1641 m | νO-H (H2O) and νsCOO− | [16,40] |
1151 m | 1144 m | 1140 m | 1138 m | ν C-O-C cyclic ether | [40,51,52,53,54,55] | |
1051 w | 1059 vw | 1078 vw | 1057 w | β = C-H deformation | [40,51,52,53,54,55] | |
947 w | 903 w | 908 w | 918 w | 916 w | νas AlO4 and δAlO4 | [40,51,52,53,54,55] |
654 vw | 650 vw | 665 w | νas AlO4 | [40,51,52,53,54,55] | ||
501 s | 513 vw | 511 w | 519 w | νas AlO6 | [40,51,52,53,54,55] | |
476 s | 476 s | 478 w | 476 s | δAlO4 | [40,51,52,53,54,55] |
3.3. Stability of the Bath Solution
3.4. Electrochemical Measurements
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Days | SA | GSA | TNSA | CSA | MSA | |
---|---|---|---|---|---|---|
np | 0 | 1.00 | 0.95 | 1.00 | 1.00 | 1.00 |
1 | 0.82 | 0.57 | 0.88 | 0.81 | 0.85 | |
3 | 0.77 | 0.41 | 0.84 | 0.72 | 0.85 | |
8 | 0.83 | 0.72 | 0.80 | 0.88 | 0.85 | |
16 | 0.79 | 0.51 | 0.75 | 0.84 | 0.72 | |
28 | 1.00 | 0.40 | 0.99 | 0.86 | 0.87 | |
nb | 0 | 0.86 | 0.87 | 0.91 | 0.91 | 0.91 |
1 | 0.86 | 0.92 | 0.83 | 0.87 | 0.86 | |
3 | 0.85 | 1.00 | 0.84 | 0.91 | 0.86 | |
8 | 0.88 | 0.92 | 0.80 | 1.00 | 0.86 | |
16 | 0.77 | 0.88 | 0.74 | 0.97 | 0.88 | |
28 | 0.85 | 0.85 | 0.87 | 0.89 | 0.89 |
Ecorr (V vs. SCE) | Icorr (A/cm2) | |
---|---|---|
SA | −0.556 ± 0.003 | |
GSA | −0.582 ± 0.002 | |
TNSA | −0.552 ± 0.004 | |
CSA | −0.706 ± 0.006 | |
MSA | −0.594 ± 0.006 |
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Proença, C.S.; Serrano, B.; Correia, J.; Araújo, M.E.M. Evaluation of Tannins as Potential Green Corrosion Inhibitors of Aluminium Alloy Used in Aeronautical Industry. Metals 2022, 12, 508. https://doi.org/10.3390/met12030508
Proença CS, Serrano B, Correia J, Araújo MEM. Evaluation of Tannins as Potential Green Corrosion Inhibitors of Aluminium Alloy Used in Aeronautical Industry. Metals. 2022; 12(3):508. https://doi.org/10.3390/met12030508
Chicago/Turabian StyleProença, Carla Sofia, Bruno Serrano, Jorge Correia, and Maria Eduarda Machado Araújo. 2022. "Evaluation of Tannins as Potential Green Corrosion Inhibitors of Aluminium Alloy Used in Aeronautical Industry" Metals 12, no. 3: 508. https://doi.org/10.3390/met12030508