SURFACE MODIFICATION OF DIE CASTING Al ALLOY ADC12 WITH HIGH Si CONTENT BY MICRO-ARC OXIDIZATION

Acta Metall Sin

2005, Vol. 41

Issue (12): 1289-1292 DOI:

Research Articles

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SURFACE MODIFICATION OF DIE CASTING Al ALLOY ADC12 WITH HIGH Si CONTENT BY MICRO-ARC OXIDIZATION

ZHANG Yongjun; LI Wenfang;WANG Fuhui

Institute of Materials Science and echnology; College of Mechanical Engineering; South China University of Technology; Guangzhou 510640

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ZHANG Yongjun; LI Wenfang; WANG Fuhui. SURFACE MODIFICATION OF DIE CASTING Al ALLOY ADC12 WITH HIGH Si CONTENT BY MICRO-ARC OXIDIZATION. Acta Metall Sin, 2005, 41(12): 1289-1292 .

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Abstract Ceramic coating on the surface of die casting Al alloy ADC12 with high Si content has been prepared by micro-arc oxidization (MAO) in an electrolyte containing Na2SiO3 and Na3PO4 as its major compositions at constant current density. The testing results of hardness and corrosion protection indicate that the obtained ceramic coating has relatively high microhardness (HV up to 1430) and could provide effective protection to substrate. Eddy currency thickness measurement and SEM micrographs manifest that the ceramic coating consists of a double-layer structure and its thickness is relatively even. EDX and XRD analyses reveal that the main elements in the coating are O, Al, Si as well as P, and that the main phases are γ-Al2O3, α-Al2O3. In addition small amounts of χ-Al2O3, θ-Al2O3 and Al2SiO5 are also detected.

Key words: die casting Al alloy ADC12 micro-arc oxidization ceramic coating

Received: 06 April 2005

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TG174.4

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2005/V41/I12/1289

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