Effect of Rare Earth Oxides on Microstructure and Corrosion Behavior of Laser-Cladding Coating on 316L Stainless Steel
Abstract
:1. Introduction
2. Experimental Methods
2.1. Preparation of Laser-Cladding Layer
2.2. Electrochemical Test and Surface Observation
3. Results and Discussion
3.1. XRD Analyses
3.2. Microstructure
3.3. Hardness Measurements
3.4. Electrochemical Studies
3.5. Salt Spray Tests
4. Conclusions
- Laser cladding is a promising surface modification technique that can not only increase the strength and hardness of the surface coating of 316L stainless steel through grain refinement but can also improve its corrosion resistance in harsh environments such as concentrated NaCl solutions;
- The modification of rare earth oxides on a laser-cladding layer can further increase hardness and corrosion resistance, and a CeO2-modified laser-cladding layer is better than one that is La2O3-modified.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Composition | C | Mn | P | S | Si | Cr | Ni | Fe |
---|---|---|---|---|---|---|---|---|
Content | 0.03 | 1.3 | 0.006 | 0.006 | 0.46 | 16.06 | 10.01 | 72.128 |
Coating | Corrosion Potential Ecorr/V | Current Density icorr/μA·cm−2 | Pitting Potential Epit/V |
---|---|---|---|
Substrate | −0.304 | 0.563 | >0.2 |
Nothing added | −0.221 | 0.316 | 0.25 |
2% CeO2 | −0.175 | 0.112 | 0.06 |
2% La2O3 | −0.290 | 0.125 | 0.08 |
Substrate | Nothing Added | CeO2 | La2O3 | |
---|---|---|---|---|
Rs/Ω·cm2 | 6.218 | 6.877 | 4.896 | 5.501 |
Rct/Ω·cm2 | 46,120 | 134,300 | 304,100 | 235,200 |
N | 0.8021 | 0.8089 | 0.8805 | 0.8642 |
Y0/Ω−1 cm2·s−n | 1.0818 × 10−4 | 6.789 × 10−5 | 3.509 × 10−5 | 4.483 × 10−5 |
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Xu, Z.; Wang, Z.; Chen, J.; Qiao, Y.; Zhang, J.; Huang, Y. Effect of Rare Earth Oxides on Microstructure and Corrosion Behavior of Laser-Cladding Coating on 316L Stainless Steel. Coatings 2019, 9, 636. https://doi.org/10.3390/coatings9100636
Xu Z, Wang Z, Chen J, Qiao Y, Zhang J, Huang Y. Effect of Rare Earth Oxides on Microstructure and Corrosion Behavior of Laser-Cladding Coating on 316L Stainless Steel. Coatings. 2019; 9(10):636. https://doi.org/10.3390/coatings9100636
Chicago/Turabian StyleXu, Zezhou, Zhiying Wang, Jian Chen, Yanxin Qiao, Junwei Zhang, and Yueming Huang. 2019. "Effect of Rare Earth Oxides on Microstructure and Corrosion Behavior of Laser-Cladding Coating on 316L Stainless Steel" Coatings 9, no. 10: 636. https://doi.org/10.3390/coatings9100636