Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Materials
2.2. Fluoride Conversion Coating Preparation
2.3. Characterization
2.4. Electrochemical Properties
2.5. Statistical Analysis
3. Results and Discussion
4. Conclusions
- (1)
- A dense and compact MgF2 coating was successfully prepared by the combination of fluoride treatment and ultrasonic treatment. When the frequency was 28 kHz during ultrasonic treatment, the surface microstructure was uniform. The chemical compositions were mainly composed of F and Mg elements.
- (2)
- Electrochemical tests in NaCl solution exhibited improved corrosion resistance. The corrosion potential of U-treatment Mg alloy constantly shifted towards the noble direction. The corrosion current density decreased due to the protectiveness of MgF2 coating without pores or cracks.
- (3)
- Immersion tests showed an improvement in the short-term instability of the MgF2 coating after ultrasonic treatment, which provided enough corrosion protection, inhibiting not only pH increase but also gas cavities formation. The improvement in corrosion resistance that MgF2 coating induced on Mg alloy was due to the formation of a compact structure without defects. This reduced the channel of the corrosive medium into the Mg alloy surface and thereby strengthened coating passivation ability. Consequently, it could be concluded that ultrasonically treated fluoride coating had much promise for their use in anti-corrosion applications of Mg alloy, such as automotive, aviation industry and temporary implants.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Li, S.; Yi, L.; Zhu, X.; Liu, T. Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy. Coatings 2020, 10, 996. https://doi.org/10.3390/coatings10100996
Li S, Yi L, Zhu X, Liu T. Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy. Coatings. 2020; 10(10):996. https://doi.org/10.3390/coatings10100996
Chicago/Turabian StyleLi, Sheng, Laihua Yi, Xiongxiang Zhu, and Tongfang Liu. 2020. "Ultrasonic Treatment Induced Fluoride Conversion Coating without Pores for High Corrosion Resistance of Mg Alloy" Coatings 10, no. 10: 996. https://doi.org/10.3390/coatings10100996