Modulation Effects of K2ZrF6 Additive on Microstructure and Heat Resistance of Micro-arc Oxide Coatings Fabricated on LY12 Aluminum Alloy

doi:10.3724/SP.J.1077.2010.00865

Abstract

Abstract:

Zr(OH)₄ particle can be formed and negatively charged in alkaline solution with K₂ZrF₆addition. Based on this mechanism, Zr-containing ceramic coatings were fabricated on LY12 aluminum alloy by microarc oxidation (MAO) using K₂ZrF₆as a special additive in Na₂SiO₃-KOH base electrolyte. The modulation effects of K₂ZrF₆ addition on micro-microstructure, element distribution and phase composition were analyzed by SEM, EDS and XRD, respectively. Heat resistance of MAO coatings formed on LY12 aluminum alloy in different electrolyte was investigated. The results show that the K₂ZrF₆addition can increase the micro-arc oxidation rate and significantly alter the structure of MAO coatings. Both the top surface and inner surface of MAO coatings fabricated in Zr-containing electrolyte become relatively smooth. Compared with the coating formed in Zr-free electrolyte, a large amount of Zr element is found in the coating formed in electrolyte with K₂ZrF₆ addition. Two main phases, γ-Al₂O₃and α-Al₂O₃, are contained in Zr-free coating. In contrast, more amorphous phase is found in Zr-containing coating with reduced amount of crystalline alumina. Experimental results also demonstrate that Zr-containing coating exhibits higher heat resistance.

Key words: aluminum alloy, microarc oxidation, micro-structure, modulation effect

CLC Number:

TG174

ZHANG Xin-Meng, CHEN Dong-Fang, GONG Chun-Zhi , YANG Shi-Qin, TIAN Xiu-Bo. Modulation Effects of K₂ZrF₆ Additive on Microstructure and Heat Resistance of Micro-arc Oxide Coatings Fabricated on LY12 Aluminum Alloy[J]. Journal of Inorganic Materials, 2010, 25(8): 865-870.

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Modulation Effects of K₂ZrF₆ Additive on Microstructure and Heat Resistance of Micro-arc Oxide Coatings Fabricated on LY12 Aluminum Alloy

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