Corrosion Protection of Steel by Epoxy-Organoclay Nanocomposite Coatings
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Epoxy Coatings
2.2. Characterization and Testing of Epoxy Polymer and Nanocomposites
2.3. Characterization of Coated Specimens and Protective Properties
3. Results and Discussion
3.1. Structure and Morphology of Organo-Clays and Epoxy-Clay Nanocomposites
3.2. Properties of Epoxy-Clay Nanocomposites
3.3. Salt Spray Corrosion Tests
3.4. Electrochemical—Open Circuit Potential Measurements
4. Conclusions
Author Contributions
Conflicts of Interest
References
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Samples Were Calcined at 600 °C | Aluminum % (Al) | Calcium % (Ca) | Iron % (Fe) | Potassium % (K) | Magnesium % (Mg) | Sodium % (Na) |
---|---|---|---|---|---|---|
Na+-PGW | 12.02 | 0.36 | 1.57 | 0.16 | 2.3 | 3.31 |
I.30E | 12.48 | 0.28 | 1.7 | 0.17 | 2.37 | 0.32 |
I.28E | 12.17 | 0.22 | 1.74 | 0.23 | 2.3 | 0.08 |
Property | Na+-PGW | I.30E | I.28E |
---|---|---|---|
Color | White Powder | White Powder | White Powder |
Cation Exchange Capacity, CEC (meq/100 g) ± 10% | 145 | – | – |
Mean Dry Particle Size (μm) | ~2 (0.5–10) | 8–10 | 8–10 |
Aspect Ratio | 200–400 | – | – |
+325 Mesh Residue (%) | – | 0.1 | 0.1 |
Specific Gravity | 2.6 | 1.71 | 1.9 |
Max Moisture (%) | 12 | 3 | 3 |
pH (5% dispersion) | 9.5–10.5 | – | – |
Bulk Density (pounds/ft3) (gm/cc) | – | 250.41 | 260.42 |
Mineral Purity (min %) | – | 98.5 | 98.5 |
Sample | Tensile Properties | Dynamic Mechanical Analysis | ||||
---|---|---|---|---|---|---|
Stress at Break (MPa) | Elongation at Break (%) | Elastic Modulus (MPa) | Storage Modulus at 40 °C (MPa) | Storage Modulus at 100 °C (MPa) | Tg (°C) | |
Pristine | 62.5 | 7.9 | 3026 | 1660 | 16 | 84.5 |
3% Na+-PGW | 64.9 | 7.3 | 3139 | 1750 | 19 | 86.9 |
3% I.30E | 69.7 | 6.4 | 3315 | 2847 | 26 | 82.6 |
3% I.28E | 57.5 | 6.0 | 3030 | 2540 | 27 | 85.5 |
6% I.30E | 55.8 | 3.7 | 3514 | 2635 | 34 | 78.5 |
6% I.28E | 47.3 | 3.4 | 3279 | 2395 | 31 | 81.3 |
Parameters of Equivalent Circuit | Bare— 0 day | Bare— 1 day | Bare— 2 days | Bare— 4 days | Epoxy— 0 day | Epoxy— 1 day | Epoxy— 2 days | Epoxy— 4 days |
---|---|---|---|---|---|---|---|---|
Rsol | 1.27 | 4.00 | 2.22 | 9.08 | 3.14 × 102 | 2.00 | 4.00 | 1.62 × 10 |
R1 | 1.42 × 103 | 9.93 × 102 | 6.55 × 102 | 3.67 | 2.15 × 103 | 5.43 × 10 | 1.87 × 10 | 5.27 × 103 |
Y01 | 3.93 × 10−4 | 1.08 × 10−2 | 3.97 × 10−2 | 3.51 × 10−2 | 1.62 × 10−6 | 4.43 × 10−3 | 1.05 × 10−3 | 2.33 × 10−3 |
n1 | 8.08 × 10−1 | 8.72 × 10−1 | 7.01 × 10−1 | 4.79 × 10−1 | 6.26 × 10−1 | 2.93 × 10−1 | 4.86 × 10−1 | 6.76 × 10−1 |
R2 | 2.48 × 10 | – | – | 1.03 × 102 | 6.78 × 105 | 7.26 × 103 | 5.38 × 103 | 7.21 × 101 |
Y02 | 1.26 × 10−3 | 5.92 × 10−2 | 4.22 × 10−2 | 9.99 × 10−2 | 2.10 × 10−6 | 1.03 × 10−3 | 2.31 × 10−3 | 1.34 × 10−3 |
n2 | 7.10 × 10−1 | 3.37 × 10−1 | 3.17 × 10−1 | 7.61 × 10−1 | 5.68 × 10−1 | 6.93 × 10−1 | 6.19 × 10−1 | 4.60 × 10−1 |
Rtot (R1 + R2) | 1.44 × 103 | 9.93 × 102 | 6.55 × 102 | 1.03 × 102 | 6.80 × 105 | 7.31 × 103 | 5.40 × 103 | 5.34 × 103 |
Parameters of Equivalent Circuit | I.28E— 0 day | I.28E— 1 day | I.28E— 2 days | I.28E— 4 days | I.30E— 0 day | I.30E— 1 day | I.30E— 2 days | I.30E— 4 days |
Rsol | 1.38 × 10 | 1.37 × 10 | 1.51 × 10 | 1.40 × 10 | 7.67 × 10 | 9.66 | 1.11 × 10 | 1.50 × 10 |
R1 | 9.36 | 2.12 × 102 | 8.12 × 103 | 7.35 × 103 | 4.93 × 104 | 1.80 × 104 | 1.09 × 103 | 6.03 × 102 |
Y01 | 1.37 × 10−4 | 7.18 × 10−4 | 8.98 × 10−4 | 2.33 × 10−3 | 9.74 × 10−6 | 2.63 × 10−6 | 4.08 × 10−5 | 4.26 × 10−5 |
n1 | 1.00 | 3.15 × 10−1 | 4.94 × 10−1 | 6.38 × 10−1 | 1.00 | 6.53 × 10−1 | 3.79 × 10−1 | 2.96 × 10−1 |
R2 | 7.99 × 104 | 8.99 × 103 | 6.24 | 4.81 × 10 | 1.54 × 105 | 2.63 × 104 | 3.02 × 104 | 2.90 × 104 |
Y02 | 3.02 × 10−5 | 8.25 × 10−4 | 1.63 × 10−4 | 1.44 × 10−3 | 8.72 × 10−6 | 7.49 × 10−5 | 1.15 × 10−4 | 3.59 × 10−4 |
n2 | 7.69 × 10−1 | 6.41 × 10−1 | 7.01 × 10−1 | 4.38 × 10−1 | 7.10 × 10−1 | 4.31 × 10−1 | 6.95 × 10−1 | 5.79 × 10−1 |
Rtot (R1 + R2) | 7.99 × 104 | 9.21 × 103 | 8.12 × 103 | 7.40 × 103 | 2.03 × 105 | 4.43 × 104 | 3.13 × 104 | 2.96 × 104 |
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Merachtsaki, D.; Xidas, P.; Giannakoudakis, P.; Triantafyllidis, K.; Spathis, P. Corrosion Protection of Steel by Epoxy-Organoclay Nanocomposite Coatings. Coatings 2017, 7, 84. https://doi.org/10.3390/coatings7070084
Merachtsaki D, Xidas P, Giannakoudakis P, Triantafyllidis K, Spathis P. Corrosion Protection of Steel by Epoxy-Organoclay Nanocomposite Coatings. Coatings. 2017; 7(7):84. https://doi.org/10.3390/coatings7070084
Chicago/Turabian StyleMerachtsaki, Domna, Panagiotis Xidas, Panagiotis Giannakoudakis, Konstantinos Triantafyllidis, and Panagiotis Spathis. 2017. "Corrosion Protection of Steel by Epoxy-Organoclay Nanocomposite Coatings" Coatings 7, no. 7: 84. https://doi.org/10.3390/coatings7070084