Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys
The corrosion kinetics and the influence of Ce content on the corrosion performance of ZK61-xCe (x = 0, 0.5, 1.0, 1.5, wt%) magnesium alloys in NaCl (0.1 mol l ^−1 ) solution were investigated using hydrogen evolution tests combined with observations of corrosion morphology. The role of compound on...
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IOP Publishing
2025-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/adc22b |
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| author | Yu Kang Feng Guo Huisheng Cai Liang Liu Rong Chai Juan Su |
| author_facet | Yu Kang Feng Guo Huisheng Cai Liang Liu Rong Chai Juan Su |
| author_sort | Yu Kang |
| collection | DOAJ |
| description | The corrosion kinetics and the influence of Ce content on the corrosion performance of ZK61-xCe (x = 0, 0.5, 1.0, 1.5, wt%) magnesium alloys in NaCl (0.1 mol l ^−1 ) solution were investigated using hydrogen evolution tests combined with observations of corrosion morphology. The role of compound on the corrosion of the alloy was analyzed based on changes in the microstructure, electrode potentials of compounds and matrix, and electrochemical properties of the corrosion product film. The results show that the corrosion rate of the experimental alloy is faster in the first 3 h, then the corrosion rate is gradually reduced, and the corrosion process fits the power-exponential dynamics equation. The corrosion rate constants k and exponential n in the corrosion kinetic equations first decrease and then increase with the increase of Ce content, with the Ce content is 0.5wt%, the alloy has the slowest corrosion rate and the best corrosion resistance. The corrosion rate of the alloy is controlled by the micro-galvanic corrosion. After adding Ce to the ZK61 alloy, the MgZn _2 in the alloy is converted to (Mg, Zn) _12 Ce with more negative electrode potential, and the electrode potential decreases from −0.811 V to −1.002 V. The electrode potential of the α -Mg matrix in the alloy is about −1.451 V, and the potential difference between the compounds and the α -Mg matrix decreases, the corrosion driving force of micro-galvanic corrosion decreases, and the corrosion resistance increases. With the increase of Ce content, the amount of (Mg, Zn) _12 Ce compounds increases, resulting in an increased number of micro-galvanic couples, increased migration charge density, and decreased corrosion resistance. As the corrosion proceeds, the number of (Mg, Zn) _12 Ce exposed on the surface of the substrate increases, blocking the contact between the substrate and the corrosion medium, himpeded lateral corrosion propagation and longitudinal corrosion extension of the α -Mg matrix. |
| format | Article |
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| institution | DOAJ |
| issn | 2053-1591 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | Materials Research Express |
| spelling | doaj-art-c2878437c3eb4b18897653fc23bf1df22025-08-20T03:11:48ZengIOP PublishingMaterials Research Express2053-15912025-01-0112505650310.1088/2053-1591/adc22bBehavior of compounds on the corrosion of ZK61-xCe magnesium alloysYu Kang0Feng Guo1https://orcid.org/0009-0007-5372-5602Huisheng Cai2Liang Liu3Rong Chai4Juan Su5Inner Mongolia University of Technology , School of Material Science and Engineering, Hohhot, Inner Mongolia, 010051, People’s Republic of ChinaInner Mongolia University of Technology , School of Material Science and Engineering, Hohhot, Inner Mongolia, 010051, People’s Republic of China; Inner Mongolia Key Laboratory of New Materials and Surface Engineering, Hohhot, 010051, People’s Republic of ChinaInner Mongolia University of Technology , School of Material Science and Engineering, Hohhot, Inner Mongolia, 010051, People’s Republic of China; Inner Mongolia Key Laboratory of New Materials and Surface Engineering, Hohhot, 010051, People’s Republic of ChinaInner Mongolia University of Technology , School of Material Science and Engineering, Hohhot, Inner Mongolia, 010051, People’s Republic of China; Inner Mongolia Key Laboratory of New Materials and Surface Engineering, Hohhot, 010051, People’s Republic of ChinaInner Mongolia University of Technology , School of Material Science and Engineering, Hohhot, Inner Mongolia, 010051, People’s Republic of ChinaInner Mongolia University of Technology , School of Material Science and Engineering, Hohhot, Inner Mongolia, 010051, People’s Republic of China; Inner Mongolia Key Laboratory of New Materials and Surface Engineering, Hohhot, 010051, People’s Republic of ChinaThe corrosion kinetics and the influence of Ce content on the corrosion performance of ZK61-xCe (x = 0, 0.5, 1.0, 1.5, wt%) magnesium alloys in NaCl (0.1 mol l ^−1 ) solution were investigated using hydrogen evolution tests combined with observations of corrosion morphology. The role of compound on the corrosion of the alloy was analyzed based on changes in the microstructure, electrode potentials of compounds and matrix, and electrochemical properties of the corrosion product film. The results show that the corrosion rate of the experimental alloy is faster in the first 3 h, then the corrosion rate is gradually reduced, and the corrosion process fits the power-exponential dynamics equation. The corrosion rate constants k and exponential n in the corrosion kinetic equations first decrease and then increase with the increase of Ce content, with the Ce content is 0.5wt%, the alloy has the slowest corrosion rate and the best corrosion resistance. The corrosion rate of the alloy is controlled by the micro-galvanic corrosion. After adding Ce to the ZK61 alloy, the MgZn _2 in the alloy is converted to (Mg, Zn) _12 Ce with more negative electrode potential, and the electrode potential decreases from −0.811 V to −1.002 V. The electrode potential of the α -Mg matrix in the alloy is about −1.451 V, and the potential difference between the compounds and the α -Mg matrix decreases, the corrosion driving force of micro-galvanic corrosion decreases, and the corrosion resistance increases. With the increase of Ce content, the amount of (Mg, Zn) _12 Ce compounds increases, resulting in an increased number of micro-galvanic couples, increased migration charge density, and decreased corrosion resistance. As the corrosion proceeds, the number of (Mg, Zn) _12 Ce exposed on the surface of the substrate increases, blocking the contact between the substrate and the corrosion medium, himpeded lateral corrosion propagation and longitudinal corrosion extension of the α -Mg matrix.https://doi.org/10.1088/2053-1591/adc22bZK61-xCe magnesium alloyscompoundsmicro-galvanic corrosioncorrosion mechanism |
| spellingShingle | Yu Kang Feng Guo Huisheng Cai Liang Liu Rong Chai Juan Su Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys Materials Research Express ZK61-xCe magnesium alloys compounds micro-galvanic corrosion corrosion mechanism |
| title | Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys |
| title_full | Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys |
| title_fullStr | Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys |
| title_full_unstemmed | Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys |
| title_short | Behavior of compounds on the corrosion of ZK61-xCe magnesium alloys |
| title_sort | behavior of compounds on the corrosion of zk61 xce magnesium alloys |
| topic | ZK61-xCe magnesium alloys compounds micro-galvanic corrosion corrosion mechanism |
| url | https://doi.org/10.1088/2053-1591/adc22b |
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