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A systematic study on the temporal evolution of soft sparking discharge characteristics and its influence on the growth behavior of Al2O3 coatings.

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Názov: A systematic study on the temporal evolution of soft sparking discharge characteristics and its influence on the growth behavior of Al2O3 coatings.
Autori: Yang, Yifeng1 (AUTHOR), Lu, Xuchen1 (AUTHOR), Xu, Xinzi1 (AUTHOR), Liu, Cancan1 (AUTHOR) liucan9933@163.com, Li, Hongtao1 (AUTHOR), Wang, Wenqiang1 (AUTHOR), Miao, Xiao2 (AUTHOR)
Zdroj: Ceramics International. Oct2025:Part A, Vol. 51 Issue 24, p41662-41671. 10p.
Predmety: *ELECTROLYTIC oxidation, *CERAMIC coating, *PLASMA flow, *ANODIC oxidation of metals, *ELECTROLYTES, *ALUMINUM alloys
Abstrakt: To explore the temporal evolution of individual and collective characteristics of soft sparking on the anode, plasma electrolytic oxidation (PEO) process was conducted on 6061 Al alloy in phosphate-silicate composite electrolytes for 9000s. Effects of the soft sparking regimes on the growth behaviors of the PEO coatings on Al substrate were studied. Results showed that the traditional soft sparking was difficult to sustain. After 3600s, most of soft sparks tended to cluster together and move rapidly as a collective group across the anode surface, entering the cluster soft sparking stage. During the two soft sparking regimes, the thickening of PEO coatings mainly occurred in the dense inner layer, which was beneath the lower boundary of the original MC coating. The two soft sparking regimes facilitated the growth of the inner dense layer of Al 2 O 3. About 6300s later, the cluster soft sparking evolved into intense arc, which seriously destroyed the integrity of the dense inner layer. Besides, the mechanisms for forming the thick and dense inner Al 2 O 3 layers during soft sparking regimes were proposed. [ABSTRACT FROM AUTHOR]
Databáza: Academic Search Index
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Abstrakt:To explore the temporal evolution of individual and collective characteristics of soft sparking on the anode, plasma electrolytic oxidation (PEO) process was conducted on 6061 Al alloy in phosphate-silicate composite electrolytes for 9000s. Effects of the soft sparking regimes on the growth behaviors of the PEO coatings on Al substrate were studied. Results showed that the traditional soft sparking was difficult to sustain. After 3600s, most of soft sparks tended to cluster together and move rapidly as a collective group across the anode surface, entering the cluster soft sparking stage. During the two soft sparking regimes, the thickening of PEO coatings mainly occurred in the dense inner layer, which was beneath the lower boundary of the original MC coating. The two soft sparking regimes facilitated the growth of the inner dense layer of Al 2 O 3. About 6300s later, the cluster soft sparking evolved into intense arc, which seriously destroyed the integrity of the dense inner layer. Besides, the mechanisms for forming the thick and dense inner Al 2 O 3 layers during soft sparking regimes were proposed. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2025.06.387