Corrosion Failure Mechanism of 2507 Duplex Stainless Steel Circulation Pump Impeller
Abstract
:1. Introduction
2. Physicochemical Experiments
2.1. Macroscopic Inspection
2.2. Chemical Composition Analysis
2.3. Metallographic Structure Analysis
2.4. Scanning Electron Microscopy and Energy Spectrum Analysis
3. Impeller Failure Analysis
4. Conclusions
- (1)
- The chemical composition of the circulation pump impeller met standard requirements. The matrix microstructure consisted of ferrite and austenite, and no abnormalities were found, indicating that the impeller’s corrosion was unrelated to the material’s quality.
- (2)
- External factors such as surface wear, cavitation, and halogen element corrosion were the primary causes of corrosion failure in the circulation pump impeller. As the blades rotated, low-pressure zones formed generating bubbles that collapsed in high-pressure areas. The impact of the bubble collapse combined with the scouring force of internal particles damaged the passive film on the stainless steel surface, creating a large cathode–small anode catalytic corrosion system. Under the accelerated corrosive action of reactive halogen ions, the corrosion rate at the damaged areas of the passive film increased, eventually leading to component failure.
- (3)
- It is recommended that the impeller inlet be rounded, shaping it to be more streamlined, in order to reduce flow separation, enhance fluid flow efficiency, and improve the impeller’s resistance to cavitation. Wear resistance and pitting corrosion protection of circulation pumps can be achieved through both the appropriate selection of materials and the application of surface engineering techniques.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
---|---|---|---|---|---|---|---|---|---|
Standard requirements | 0.030 | 0.80 | 1.20 | 0.035 | 0.020 | 24.0~26.0 | 6.0~8.0 | 3.0~5.0 | 0.24~0.32 |
Sample composition | 0.015 | 0.46 | 0.52 | 0.023 | 0.016 | 24.89 | 7.26 | 3.83 | 0.28 |
Phase Type | Fe | Cr | Mo | Ni | N | Si | Phase Category |
---|---|---|---|---|---|---|---|
Gray | 67.31 | 21.30 | 3.32 | 7.10 | 0.21 | 0.76 | α phase |
Black | 64.56 | 24.32 | 5.67 | 4.53 | 0.27 | 0.65 | γ phase |
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Wang, W.; Hou, C.; Li, J.; Shi, M.; Chen, J.; Qian, G. Corrosion Failure Mechanism of 2507 Duplex Stainless Steel Circulation Pump Impeller. Processes 2024, 12, 1897. https://doi.org/10.3390/pr12091897
Wang W, Hou C, Li J, Shi M, Chen J, Qian G. Corrosion Failure Mechanism of 2507 Duplex Stainless Steel Circulation Pump Impeller. Processes. 2024; 12(9):1897. https://doi.org/10.3390/pr12091897
Chicago/Turabian StyleWang, Weihua, Chengbao Hou, Jiaxing Li, Mingxiao Shi, Jiugong Chen, and Gong Qian. 2024. "Corrosion Failure Mechanism of 2507 Duplex Stainless Steel Circulation Pump Impeller" Processes 12, no. 9: 1897. https://doi.org/10.3390/pr12091897