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Materials 2018, 11(1), 63; https://doi.org/10.3390/ma11010063

The Study on the Overall Plasma Electrolytic Oxidation for 6061–7075 Dissimilar Aluminum Alloy Welded Parts Based on the Dielectric Breakdown Theory

1
Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014, China
2
Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloys, Jinan 250014, China
3
Shandong Key Laboratory for High Strength Lightweight Metallic Materials (HLM), Jinan 250014, China
4
Institute of Metal Research Chinese Academy of Sciences, Shenyang 110016, China
*
Author to whom correspondence should be addressed.
Received: 29 November 2017 / Revised: 28 December 2017 / Accepted: 29 December 2017 / Published: 2 January 2018
(This article belongs to the Special Issue Metals Functionalization via Plasma Electrolytic Oxidation)
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Abstract

Electrical connection of dissimilar metals will lead to galvanic corrosion. Therefore, overall surface treatment is necessary for the protection of dissimilar metal welded parts. However, serious unbalanced reactions may occur during overall surface treatment, which makes it difficult to prepare integral coating. In this paper, an overall ceramic coating was fabricated by plasma electrolytic oxidation to wrap the 6061–7075 welded part integrally. Moreover, the growth mechanism of the coating on different areas of the welded part was studied based on the dielectric breakdown theory. The reaction sequence of each area during the treatment was verified through specially designed dielectric breakdown tests. The results showed that the high impedance overall of ceramic coating can inhibit the galvanic corrosion of the 6061–7075 welded part effectively. View Full-Text
Keywords: overall plasma oxidation; dielectric breakdown; ceramic coating; dissimilar metal welded parts; welded joint overall plasma oxidation; dielectric breakdown; ceramic coating; dissimilar metal welded parts; welded joint
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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.

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