The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory
Abstract
:1. Introduction
2. Experimental
2.1. Materials
2.2. Pre-Treatment
2.3. Overall Plasma Electrolytic Oxidation
2.4. Characterization and Testing
3. Results and Discussion
3.1. SEM Morphology and EDS Analysis of the Ceramic Coating
3.2. Cross-Section Morphologies and Analysis of the Ceramic Coating
3.3. XRD Analysis of the Ceramic Coating in Each Area of the 6061–7075 Welded Part
3.4. The Growth Mechanism of the Overall Ceramic Coating Based on the Dielectric Breakdown Theory
3.5. Corrosion Resistance of Ceramic Coating in Different Areas of the Welded Part
4. Conclusions
- (1)
- The 6061–7075 dissimilar aluminum welded part was successfully treated by overall plasma oxidation and the welded part was integrally wrapped by a ceramic coating.
- (2)
- The ceramic coating on the surface of welding area was different from the coating on base metal (6061/7075) in both morphology and composition. The coating on the welding area was mainly made of α-Al2O3 and γ-Al2O3, while the coating on the 6061 and 7075 consisted of α-Al2O3, γ-Al2O3, mullite and small amount of P-containing amorphous.
- (3)
- Reaction priority and sequence during overall plasma oxidation of 6061–7075 welded part was observed. The plasma oxidation reaction prefers to occur in the sequence of 6061 aluminum, 7075 aluminum, and welding area.
- (4)
- The overall plasma oxidation improved the corrosion resistance of all areas on 6061–7075 welded part and reduced the corrosion potential difference between different areas.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Si | Fe | Cu | Mn | Mg | Cr | Zn | Al |
---|---|---|---|---|---|---|---|
0.59 | 0.42 | 0.19 | 0.01 | 0.93 | 0.18 | 0.12 | balance |
Si | Fe | Cu | Mn | Mg | Cr | Zn | Al |
---|---|---|---|---|---|---|---|
0.05 | 0.16 | 1.43 | 0.02 | 2.58 | 0.23 | 5.79 | balance |
Area | 6061 | Welding Area | 7075 | ||||
---|---|---|---|---|---|---|---|
Treatment | Ecorr/V | Icorr/e−5 A/cm2 | Ecorr/V | Icorr/e−5 A/cm2 | Ecorr/V | Icorr/e−5 A/cm2 | |
Uncoated | −0.7655 | 4.359 | −0.8633 | 6.239 | −0.7999 | 5.183 | |
Coated | −0.7172 | 2.138 | −0.7537 | 2.032 | −0.7289 | 1.636 |
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Chen, Y.; Song, X.; Zhou, J.; Liu, H.; Yang, Y. The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory. Materials 2018, 11, 63. https://doi.org/10.3390/ma11010063
Chen Y, Song X, Zhou J, Liu H, Yang Y. The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory. Materials. 2018; 11(1):63. https://doi.org/10.3390/ma11010063
Chicago/Turabian StyleChen, Yanfei, Xiaocun Song, Jixue Zhou, Hongtao Liu, and Yuansheng Yang. 2018. "The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory" Materials 11, no. 1: 63. https://doi.org/10.3390/ma11010063
APA StyleChen, Y., Song, X., Zhou, J., Liu, H., & Yang, Y. (2018). The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory. Materials, 11(1), 63. https://doi.org/10.3390/ma11010063