The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution
Abstract
:1. Introduction
2. Experiment
2.1. Desulfurization Solution Analysis
2.2. Immersion Test
2.3. Electrochemical Measurements
2.4. Morphologies and Component Analysis
3. Results and Discussion
3.1. Composition of the Desulfurization Solution
3.2. Corrosion Morphology
3.3. Corrosion Products Analysis
3.4. Mass Loss and Corrosion Rate
3.5. Open Circuit Potential Measurements
3.6. Electrochemical Impedance Spectroscopy
3.7. Polarization Curves
3.8. The Corrosion Mechanism of Q235B Steel
4. Conclusions
- (1)
- There was scale sediments attached to the surface of the steel. For 7 days of immersion, the sediments patches were connected and distributed on the matrix surface. The compactness of the sediments increased with time. The initial corrosion products was composed of Fe(OH)2, Fe(OH)3, and Fe2O3·H2O, the end corrosion products consisted of Fe2O3·H2O, FeSO4·4H2O, and Fe3O4.
- (2)
- For immersion test, the Vcorr reduced gradually with 35 days of immersion. However, the results of electrochemical measurement showed that the Vcorr was fluctuant in reality.
- (3)
- In the initial immersion stage (7 days), the primary corrosion type was general corrosion, pitting corrosion was slight and dispersed under the sediments. In the later stage of corrosion (35 days), the cyclic regeneration mechanism of acid, induced by oxidation hydrolysis of FeSO4, aggravated the pitting corrosion.
- (4)
- Though the sediments attached to the steel surface could inhibit corrosion, pitting corrosion under the sediments would bring about more serious damage (leak of pipeline and increase of equipment fault rate) thus should be given more attention.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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C | Al | Si | P | S | Mn | Fe |
---|---|---|---|---|---|---|
0.15 | 0.184 | 0.128 | 0.017 | 0.013 | 0.218 | bal |
Content | Chemical Formula | Value |
---|---|---|
Na+ | 2785.5 | |
K+ | 540.7 | |
Mg2+ | 4.7 | |
Ca2+ | 26.2 | |
Zn2+ | 90.2 | |
Ionic concentration (mg L−1) | SO42− | 15,300.3 |
SO32− | 9580.5 | |
NH4+ | 224.6 | |
NO3− | 3.4 | |
NO2− | 0.3 | |
Organics concentration (mg L−1) | PAHs | 158.7 |
Suspended solids concentration (mg L−1) | 2519.5 | |
pH | 6.95 ± 0.08 |
Time/d | 7 | 14 | 21 | 28 | 35 |
---|---|---|---|---|---|
Vcorr/(mm/a) | 0.22 | 0.15 | 0.11 | 0.10 | 0.08 |
ΔVcorr/(mm/a) | — | 0.07 | 0.04 | 0.01 | 0.02 |
Time/d | Rs/(Ω·cm2) | Qdl/(F·cm−2) | n | Rt/(Ω·cm2) |
---|---|---|---|---|
7 | 14.03 ± 0.15 | (4.48 ± 0.03) × 10−4 | 0.7474 ± 0.008 | 1092 ± 2.6 |
14 | 15.68 ± 0.13 | (7.82 ± 0.05) × 10−4 | 0.7588 ± 0.005 | 1224 ± 3.1 |
21 | 16.63 ± 0.11 | (9.01 ± 0.07) × 10−4 | 0.7988 ± 0.003 | 1545 ± 1.8 |
28 | 17.77 ± 0.13 | (1.29 ± 0.08) × 10−4 | 0.7784 ± 0.005 | 1469 ± 2.5 |
35 | 20.01 ± 0.09 | (1.61 ± 0.05) × 10−4 | 0.7619 ± 0.006 | 1430 ± 2.7 |
7 days | 14 days | 21 days | 28 days | 35 days | |
---|---|---|---|---|---|
Ecorr V | −1.133 | −1.174 | −1.167 | −1.172 | −1.171 |
icorr μA/cm2 | 7.231 | 8.074 | 6.690 | 7.532 | 7.459 |
Rp Ω·cm2 | 3607 | 3231 | 3899 | 3497 | 3463 |
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Gong, P.; Zhang, G.; Chen, J. The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution. Materials 2020, 13, 3783. https://doi.org/10.3390/ma13173783
Gong P, Zhang G, Chen J. The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution. Materials. 2020; 13(17):3783. https://doi.org/10.3390/ma13173783
Chicago/Turabian StyleGong, Peng, Guangxu Zhang, and Jian Chen. 2020. "The Corrosion Features of Q235B Steel under Immersion Test and Electrochemical Measurements in Desulfurization Solution" Materials 13, no. 17: 3783. https://doi.org/10.3390/ma13173783