Long-Term In-Situ Study of Mild Steel Stress Corrosion Cracking Kinetics in a Carbonate-Rich Solution †
Abstract
:1. Introduction
2. Literature
3. Specific Conditions
4. Experimental
4.1. Objectives
- The SCC crack growth kinetics from pre-existing cracks would be established. This approach would eliminate the “Stage 1” period in the SCC growth, where the required conditions for cracking are first established.
- SCC crack growth velocities in three distinct tank zones would be studied; close to the floor where permanent wetting would take place, at the “surface zone” where the steel is mostly covered by the tank content but where alternate wetting and drying will take place as tank levels vary (27% of tank height, immersed for ~80 per cent of the time), as well as in the “top zone” (50% of tank height) where the samples would be fully immersed for only ~40% of the time.
- Four successive exposure periods would be utilized, with the full study covering 13,080 h.
4.2. Technique
5. Experimental Results
5.1. First Exposure Period
5.2. Longer Exposure Periods
6. Discussion and Conclusions
Acknowledgments
Conflicts of Interest
References
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NH4+ | H2S | Cl− | SO42− | CO32− | pH | |
---|---|---|---|---|---|---|
Tank 1 | 1.52 | 0.35 | 0.98 | 5.4 | 1.82 | 8.93 |
Ref. [7] | 3.05 | 1.45 | 2.2 | 0.075 | 2.85 | 9.5 |
C | Mn | P | Si | Al | N |
---|---|---|---|---|---|
0.21 | 1.10 | 0.015 | 0.007 | 0.028 | 90 |
Immersion Period, Hours | Top Zone, % Immersion | Surface Zone, % Immersion | Top Zone, # Drying Incidents | Surface Zone, # Drying Incidents |
---|---|---|---|---|
0–670 | 0 | 94 | 1 | 1 |
671–2328 | 0 | 98 | 1 | 1 |
2329–5940 | 34 | 66 | 4 | 4 |
5941–13,080 | 30 | 76 | 10 | 9 |
0–13,080 | 22.9 | 77 | 16 | 15 |
Sample | Max. Crack Depth, mm | Average Crack Depth, mm | Ratio, amax/aave |
---|---|---|---|
Floor,TL | 0.82 | 0.24 | 3.42 |
Floor, LT | 0.83 | 0.24 1 | 3.46 |
Vapour, LT | 0.17 2 | - | - |
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Mostert, R. Long-Term In-Situ Study of Mild Steel Stress Corrosion Cracking Kinetics in a Carbonate-Rich Solution. Proceedings 2018, 2, 377. https://doi.org/10.3390/ICEM18-05197
Mostert R. Long-Term In-Situ Study of Mild Steel Stress Corrosion Cracking Kinetics in a Carbonate-Rich Solution. Proceedings. 2018; 2(8):377. https://doi.org/10.3390/ICEM18-05197
Chicago/Turabian StyleMostert, Roelf. 2018. "Long-Term In-Situ Study of Mild Steel Stress Corrosion Cracking Kinetics in a Carbonate-Rich Solution" Proceedings 2, no. 8: 377. https://doi.org/10.3390/ICEM18-05197
APA StyleMostert, R. (2018). Long-Term In-Situ Study of Mild Steel Stress Corrosion Cracking Kinetics in a Carbonate-Rich Solution. Proceedings, 2(8), 377. https://doi.org/10.3390/ICEM18-05197