Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels
Abstract
:1. Introduction
2. Experimental Section
2.1. Materials and Mechanical Tests
2.2. Electrochemical Tests
3. Results and Discussion
3.1. Microstructure and Tensile Properties
3.2. Pitting Corrosion Resistance
3.3. Passive Behavior
3.4. General Corrosion Behavior
4. Conclusions
- (1)
- Potentiodynamic polarization tests in chloride solutions revealed that the alloying Mo suppressed metastable pitting corrosion and raised both Epit and Erp of the alloys. In addition, it was found that the difference between the Epit and Erp decreased as the Mo content increased.
- (2)
- Passive film analysis through a resistance measurement and Mott-Schottky analysis indicated that the alloyed Mo increased the film resistance by decreasing the number of point defects in the passive film.
- (3)
- The alloyed Mo reduced the critical dissolution rate of the alloys in acidified chloride solutions, and the alloy with higher Mo content was able to resist active dissolution in stronger acid.
- (4)
- It is concluded that the alloying Mo enhanced pitting corrosion resistance of the alloy through increasing protectiveness of passive film and lowering pit propagation rate.
Author Contributions
Funding
Conflicts of Interest
References
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Alloys | Fe | Cr | Mn | Mo | N | C | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
---|---|---|---|---|---|---|---|---|---|
0Mo | Balance | 18.19 | 9.72 | - | 0.36 | 0.50 | 502.1 | 957.2 | 61.7 |
1Mo | 17.89 | 9.81 | 1.13 | 0.40 | 0.47 | 499.2 | 897.5 | 56.4 | |
2Mo | 18.10 | 9.47 | 2.17 | 0.38 | 0.48 | 529.0 | 979.9 | 62.1 |
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Ha, H.-Y.; Lee, T.-H.; Bae, J.-H.; Chun, D.W. Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels. Metals 2018, 8, 653. https://doi.org/10.3390/met8080653
Ha H-Y, Lee T-H, Bae J-H, Chun DW. Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels. Metals. 2018; 8(8):653. https://doi.org/10.3390/met8080653
Chicago/Turabian StyleHa, Heon-Young, Tae-Ho Lee, Jee-Hwan Bae, and Dong Won Chun. 2018. "Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels" Metals 8, no. 8: 653. https://doi.org/10.3390/met8080653