Abstract
Plasma electrolytic oxidation has been developed rapidly in recent years due to its unique advantages, such as the simple instrumentation, high efficiency and low-cost, no pollution etc. The ceramic coatings achieved by plasma electrolytic oxidation exhibit excellent anticorrosion resistance, good hardness and tribological properties. The process is also boasted for its non-lineof-sight and can treat irregular shaped specimens. However, the coatings show non-uniformity in thickness when complex-shaped specimens are treated. Such factors as the shape of the specimen, the location of the cathode electrode, etc have a critical influence on spatial distribution of anode current. This may lead to nonuniformity of oxided layers. In this paper, the current flowing through the plate samples (2024 alluminum alloy) was monitored in the sodium silicate solution system during plasma electrolytic oxidation. The distance between the anode and cathode affects the anode current which has an effect on oxidation efficiency. The anode current increases with increasing anode area but slightly changes with the cathode area. The current flowing to the plate back is evidently smaller than that flowing to the plate front, which also cause the non-uniformity in coating thickness. The pin-on-disk test also testifies the effect of non-uniformity of spatial current of the anode (sample).
| Original language | English |
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| Publication status | Published - Sept 2005 |
| Event | Fifth Asian-European International Conference on Plasma Surface Engineering (AEPSE 2005) - Qingdao, China Duration: 12 Sept 2005 → 16 Sept 2005 |
Conference
| Conference | Fifth Asian-European International Conference on Plasma Surface Engineering (AEPSE 2005) |
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| Abbreviated title | AEPSE 2005 |
| Place | China |
| City | Qingdao |
| Period | 12/09/05 → 16/09/05 |