Preparation of Sol-Gel Derived Anticorrosive Coating on Q235 Carbon Steel Substrate with Long-Term Corrosion Prevention Durability
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Preparation of Sol-gel Coatings
2.2.1. Preparation of Liquid Dispersion for Undercoat
2.2.2. Preparation of Liquid Dispersion for Topcoat
2.2.3. Coating Deposition
2.3. Characterizations
2.4. Coating Performance Testing
2.5. Salt Spray Testing
2.6. Outdoor Exposure Testing
3. Results and Discussion
3.1. Preparation of the Sol-gel Coatings
3.2. Coating Morphological Characterization
3.2.1. SEM Analysis
3.2.2. EDS Analysis
3.2.3. AFM Analysis
3.3. Coating Anticorrosion Performances
3.3.1. Physical Properties
3.3.2. Salt Spray Test
3.3.3. Outdoor Exposure Tests
3.3.4. EIS Measurements
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Elements | Top Layer (Top View) (at.%) | Top Layer (Cross-Section) (at.%) | Underlying Layer (Top View) (at.%) | Underlying Layer (Cross-Section) (at.%) |
---|---|---|---|---|
O | 61.8 ± 4.1 | 58.7 ± 4.9 | 62.3 ± 4.4 | 65.6 ± 6.2 |
Si | 38.1 ± 1.4 | 41.3 ± 1.8 | 31.8 ± 1.3 | 28.8 ± 1.5 |
Ti | 0.1 ± 0.0 | 0.1 ± 0.0 | 5.9 ± 0.3 | 5.6 ± 0.3 |
Coating | Immersion Time | Rtl (Ω·cm2) | CPEtl | Rul (Ω·cm2) | CPEul | χ2 10−3 | ||
---|---|---|---|---|---|---|---|---|
Y0 (Ω−1·sn·cm−2) | n | Y0 (Ω−1·sn·cm−2) | n | |||||
Two-layer | 1 d | 2.11 ± 0.02 × 106 | 4.38 ± 0.06 × 10−9 | 0.956 ± 0.001 | 3.17 ± 0.06 × 108 | 2.32 ± 0.02 × 10−8 | 0.778 ± 0.003 | 1.9881 |
5 d | 1.90 ± 0.04 × 106 | 4.66 ± 0.07 × 10−9 | 0.952 ± 0.002 | 2.84 ± 0.05 × 108 | 2.35 ± 0.02 × 10−8 | 0.786 ± 0.003 | 1.9358 | |
26 d | 1.94 ± 0.06 × 106 | 5.21 ± 0.09 × 10−9 | 0.947 ± 0.002 | 3.18 ± 0.07 × 108 | 2.27 ± 0.02 × 10−8 | 0.789 ± 0.003 | 2.0837 | |
63 d | 2.64 ± 0.06 × 106 | 5.49 ± 0.08 × 10−9 | 0.946 ± 0.001 | 4.33 ± 0.11 × 108 | 2.11 ± 0.02 × 10−8 | 0.787 ± 0.004 | 2.2237 | |
99 d | 1.82 ± 0.04 × 106 | 6.00 ± 0.09 × 10−9 | 0.941 ± 0.002 | 2.97 ± 0.06 × 108 | 2.23 ± 0.02 × 10−8 | 0.786 ± 0.003 | 1.9318 | |
One-layer | Immersion Time | Rcoat (Ω·cm2) | CPEcoat | Rct (Ω·cm2) | CPEdl | χ2 10−3 | ||
2 h | 1.14 ± 0.43 × 105 | 6.27 ± 0.23 × 10−9 | 0.971 ± 0.003 | 5.88 ± 0.64 × 105 | 1.90 ± 0.20 × 10−7 | 0.409 ± 0.030 | 1.1674 | |
4 h | 2.00 ± 0.44 × 105 | 6.46 ± 0.25 × 10−9 | 0.969 ± 0.003 | 6.09 ± 0.75 × 105 | 1.82 ± 0.29 × 10−7 | 0.476 ± 0.050 | 2.9885 | |
1 d | 2.21 ± 0.38 × 104 | 5.40 ± 0.49 × 10−9 | 0.984 ± 0.007 | 3.70 ± 0.12 × 105 | 1.05 ± 0.05 × 10−6 | 0.409 ± 0.014 | 5.7427 | |
7 d | 4.66 ± 0.08 × 103 | 7.33 ± 0.53 × 10−9 | 0.962 ± 0.006 | 1.27 ± 0.02 × 105 | 2.64 ± 0.06 × 10−6 | 0.620 ± 0.005 | 2.2603 | |
16 d | 1.71 ± 0.02 × 103 | 2.49 ± 0.24 × 10−8 | 0.872 ± 0.008 | 1.11 ± 0.01 × 105 | 9.50 ± 0.12 × 10−6 | 0.647 ± 0.003 | 2.2467 |
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Li, Y.; Wu, C.; Xue, M.; Cai, J.; Huang, Y.; Yang, H. Preparation of Sol-Gel Derived Anticorrosive Coating on Q235 Carbon Steel Substrate with Long-Term Corrosion Prevention Durability. Materials 2019, 12, 1960. https://doi.org/10.3390/ma12121960
Li Y, Wu C, Xue M, Cai J, Huang Y, Yang H. Preparation of Sol-Gel Derived Anticorrosive Coating on Q235 Carbon Steel Substrate with Long-Term Corrosion Prevention Durability. Materials. 2019; 12(12):1960. https://doi.org/10.3390/ma12121960
Chicago/Turabian StyleLi, Yue, Chunchun Wu, Ming Xue, Jiawen Cai, Yi Huang, and Hui Yang. 2019. "Preparation of Sol-Gel Derived Anticorrosive Coating on Q235 Carbon Steel Substrate with Long-Term Corrosion Prevention Durability" Materials 12, no. 12: 1960. https://doi.org/10.3390/ma12121960