A Comparative Study of the Corrosion Behavior of 30CrMnSiNi2A in Artificial Seawater and Salt Spray Environments
Abstract
:1. Introduction
2. Experimental Procedure
2.1. Materials and Solution
2.2. Electrochemical Measurement
2.3. Immersion Test and Salt Spray Test
2.4. Slow Strain Rate Tensile Test (SSRT)
3. Results and Discussion
3.1. Electrochemical Analysis
3.1.1. Open Circuit Potential Analysis
3.1.2. Electrochemical Impedance Spectroscopy Analysis
3.1.3. Potentiodynamic Polarization Behavior Analysis
3.2. Comparison of the Corrosion Behavior in the Salt Spray and Immersion Tests
3.2.1. Corrosion Rate
3.2.2. Corrosion Product Analysis
3.2.3. Corrosion Process and Mechanism
3.3. SCC Behavior Analysis
3.3.1. Stress-Strain Curves
3.3.2. Fracture Morphology after SSRT
3.3.3. SCC Mechanism
4. Conclusions
- (1)
- The changes in the solution temperature and pH significantly affect the electrochemical behavior. The anodic process is controlled by active dissolution, while the cathodic process is controlled by oxygen reduction in a neutral solution and by hydrogen evolution in an acidic solution. The decrease in the pH value mainly accelerates the cathodic reaction, and the temperature simultaneously promotes the anodic and cathodic reactions.
- (2)
- The corrosion products of 30CrMnSiNi2A steel were mainly composed of α-FeOOH, γ-FeOOH, and Fe3O4, as well as trace amount of Fe(OH)2, α-Fe2O3, and FeO. The corrosion rate in the salt spray environment was much higher than that in the immersion test, which is due to the differences in the available oxygen concentrations and the corrosion product properties.
- (3)
- The SCC sensitivity of the as-received 30CrMnSiNi2A steel was about 4.2% and 25% in terms of the elongation loss and reduction-in-area loss, respectively. The relatively higher index obtained by the reduction-in-area suggests that the SCC degradation is dominated by anodic dissolution.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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T (°C) | pH | Rs | Rct | CPEdl | n1 | RL | L | χ2 | Model |
---|---|---|---|---|---|---|---|---|---|
30 | 3.0 | 6.2 | 94.3 | 4.69 × 10−4 | 0.83 | 22.7 | 202.4 | 8.5 × 10−4 | B |
30 | 4.5 | 6.4 | 230.6 | 1.30 × 10−3 | 0.67 | 2.5 × 10−3 | A | ||
30 | 6.0 | 5.1 | 506.7 | 7.97 × 10−4 | 0.75 | 1.1 × 10−3 | A | ||
30 | 8.2 | 8.1 | 731.6 | 7.60 × 10−4 | 0.70 | 5.4 × 10−4 | A | ||
20 | 8.2 | 6.2 | 699.0 | 1.72 × 10−3 | 0.62 | 2.1 × 10−3 | A | ||
40 | 8.2 | 5.0 | 524.1 | 2.25 × 10−3 | 0.64 | 1.6 × 10−3 | A |
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Zhao, L.; He, W.; Wang, Y.; Li, H.; Cui, Z. A Comparative Study of the Corrosion Behavior of 30CrMnSiNi2A in Artificial Seawater and Salt Spray Environments. Metals 2022, 12, 1443. https://doi.org/10.3390/met12091443
Zhao L, He W, Wang Y, Li H, Cui Z. A Comparative Study of the Corrosion Behavior of 30CrMnSiNi2A in Artificial Seawater and Salt Spray Environments. Metals. 2022; 12(9):1443. https://doi.org/10.3390/met12091443
Chicago/Turabian StyleZhao, Lianhong, Weiping He, Yingqin Wang, Han Li, and Zhongyu Cui. 2022. "A Comparative Study of the Corrosion Behavior of 30CrMnSiNi2A in Artificial Seawater and Salt Spray Environments" Metals 12, no. 9: 1443. https://doi.org/10.3390/met12091443