Corrosion Performance of Nano-ZrO2 Modified Coatings in Hot Mixed Acid Solutions
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Preparation
2.2. Preparation of Nano-ZrO2 Concentrates
2.3. Preparation of Nano-ZrO2-Modified Coatings
2.4. Particle Size Analysis of Nano-ZrO2 Concentrate
2.5. Surface Properties
2.6. Electrochemical Studies
3. Results and Discussion
3.1. Characterization of Nano-ZrO2 Concentrates
3.2. Acid Immersion Test and Corrosion Morphologies
3.3. Electrochemically-Evaluated Corrosion Response
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample Coding 1 | Composition |
---|---|
Coating Z-0 | 65% phenolic-epoxy resin, 0.5% KH550 silane coupling agent, 34.1% 240 mesh glass flake, 0.4% BYK106 dispersant, 30% HN01 curing agent |
Coating Z-1 | Coating Z-0 + 1.49% nano-ZrO2 concentrate (1% nano-ZrO2) |
Coating Z-3 | Coating Z-0 + 4.48% nano-ZrO2 concentrate (3% nano-ZrO2) |
Coating Z-5 | Coating Z-0 + 7.46% nano-ZrO2 concentrate (5% nano-ZrO2) |
Samples | Ra (nm) | RMS (nm) |
---|---|---|
Z-0 Coating | 24.58 | 73.60 |
Z-1 Coating | 12.79 | 27.44 |
Z-3 Coating | 5.94 | 16.10 |
Z-5 Coating | 20.42 | 52.03 |
Samples | Element | At % | |
---|---|---|---|
Before immersion | Z-0, Z-1, Z-3 and Z-5 Coatings | C1s | 79.86 |
O1s | 17.01 | ||
N1s | 1.8 | ||
After immersion | Z-0 Coating | C1s | 77.82 |
O1s | 20.47 | ||
N1s | 1.71 | ||
Z-1 Coating | C1s | 80.37 | |
O1s | 18.46 | ||
N1s | 1.16 | ||
Z-3 Coating | C1s | 80.77 | |
O1s | 17.31 | ||
N1s | 1.93 | ||
Z-5 Coating | C1s | 76.99 | |
O1s | 19.81 | ||
N1s | 3.21 |
Sample | Immersion Time/h | Rs/Ω·cm2 | Qcoat/sn·Ω−1·cm−2 | αcoat | Ceffcoat/F·cm−2 | Rcoat/Ω·cm−2 | Qdl/sn·Ω−1·cm−2 | αdl | Rct/Ω·cm2 | Chsq |
---|---|---|---|---|---|---|---|---|---|---|
Z-0 Coating | 30 min | 0.36 | 2.44 × 10−9 | 0.896 | 2.16 × 10−10 | 1.81 × 106 | 2.02 × 10−7 | 0.2517 | 2.54 × 106 | 1.30 × 10−3 |
24 h | 0.36 | 3.41 × 10−10 | 1 | 3.41 × 10−10 | 4.60 × 104 | 1.67 × 10−7 | 0.5321 | 5.63 × 105 | 2.21 × 10−3 | |
120 h | 393 | 2.88 × 10−9 | 0.9113 | 7.59 × 10−10 | 1.48× 104 | 1.99 × 10−4 | 0.1117 | 2.53 × 105 | 3.59 × 10−4 | |
192 h | 138 | 4.84 × 10−7 | 0.6298 | 1.66 × 10−9 | 3.26 × 103 | 5.58 × 10−4 | 0.4868 | 2.84 × 104 | 1.94 × 10−4 | |
Z-1 Coating | 30 min | 0.36 | 2.10 × 10−9 | 0.9337 | 4.73 × 10−10 | 9.51 × 104 | 1.17 × 10−6 | 0.296 | 3.70 × 105 | 2.12 × 10−3 |
24 h | 0.37 | 3.88 × 10−10 | 1 | 3.88 × 10−10 | 1.11 × 105 | 4.76 × 10−7 | 0.3895 | 6.08 × 105 | 1.16 × 10−3 | |
120 h | 0.36 | 7.46 × 10−9 | 0.8793 | 4.97 × 10−10 | 6.89 × 104 | 2.24 × 10−6 | 0.1965 | 3.58 × 105 | 9.63 × 10−4 | |
192 h | 723 | 4.89 × 10−8 | 0.7395 | 1.32 × 10−9 | 5.10 × 104 | 2.47 × 10−5 | 0.4372 | 1.52 × 105 | 3.34 × 10−3 | |
Z-3 Coating | 30 min | 0.36 | 2.16 × 10−9 | 0.8403 | 4.02 × 10−11 | 8.26 × 107 | 1.07 × 10−7 | 0.4962 | 1.11 × 108 | 1.68 × 10−3 |
24 h | 0.36 | 1.09 × 10−9 | 0.9344 | 2.37 × 10−10 | 2.38 × 106 | 1.76 × 10−8 | 0.3601 | 8.67 × 106 | 2.37 × 10−3 | |
120 h | 0.36 | 1.52 × 10−9 | 0.9331 | 3.28 × 10−10 | 1.26 × 106 | 3.28 × 10−7 | 0.4515 | 1.31 × 106 | 2.15 × 10−3 | |
192 h | 0.36 | 1.11 × 10−9 | 0.9572 | 4.21 × 10−10 | 1.04 × 105 | 8.61 × 10−6 | 0.2803 | 2.80 × 105 | 3.97 × 10−4 | |
Z-5 Coating | 30 min | 0.36 | 2.47 × 10−9 | 0.8815 | 1.50 × 10−10 | 3.21 × 106 | 2.67 × 10−8 | 0.2855 | 4.09 × 107 | 2.55 × 10−3 |
24 h | 0.36 | 2.34 × 10−9 | 0.9338 | 5.31 × 10−10 | 2.01 × 105 | 2.61 × 10−7 | 0.3371 | 1.49 × 106 | 2.29 × 10−3 | |
120 h | 228 | 1.19 × 10−7 | 0.6911 | 1.08 × 10−9 | 4.31 × 104 | 4.41 × 10−5 | 0.3982 | 4.53 × 104 | 4.51 × 10−4 | |
192 h | 67.3 | 2.35 × 10−8 | 0.8619 | 2.74 × 10−9 | 1.41× 103 | 5.10 × 10−4 | 0.2736 | 5.76 × 103 | 4.13 × 10−4 |
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Xu, W.; Wang, Z.; Han, E.-H.; Wang, S.; Liu, Q. Corrosion Performance of Nano-ZrO2 Modified Coatings in Hot Mixed Acid Solutions. Materials 2018, 11, 934. https://doi.org/10.3390/ma11060934
Xu W, Wang Z, Han E-H, Wang S, Liu Q. Corrosion Performance of Nano-ZrO2 Modified Coatings in Hot Mixed Acid Solutions. Materials. 2018; 11(6):934. https://doi.org/10.3390/ma11060934
Chicago/Turabian StyleXu, Wenhua, Zhenyu Wang, En-Hou Han, Shuai Wang, and Qian Liu. 2018. "Corrosion Performance of Nano-ZrO2 Modified Coatings in Hot Mixed Acid Solutions" Materials 11, no. 6: 934. https://doi.org/10.3390/ma11060934