Effect of Different Ca Content on Microstructure and Electrochemical Performance of As-Cast AZ31 Magnesium Alloy Sacrificial Anodes

The effect of ca on the as-cast microstructure and electrochemical performance of AZ31 anode was investigated. The results show that addition of Ca to AZ31 anodes can result in not only grain refinement, but also a change in both morphology and volume fraction of the second phases. And grain refinem...

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Veröffentlicht in:	Applied Mechanics and Materials 2013-10, Vol.431 (Mechanical Engineering, Industrial Materials and Industrial Electronics), p.42-47
Hauptverfasser:	Min, Guang Hui, Cui, Hong Wei, Du, Xiao Hong, Li, Ting Bin, Ding, Hong Wei
Format:	Artikel
Sprache:	eng
Schlagworte:	Anode effect Anodes Cathodic protection Corrosion potential Current efficiency Efficiency Electrochemical analysis GNP Grain growth Grain refinement Gross National Product Intermetallic compounds Magnesium alloys Magnesium base alloys Microscopy Microstructure Morphology Open circuit voltage Phases Sacrificial anodes Solids
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Zusammenfassung:	The effect of ca on the as-cast microstructure and electrochemical performance of AZ31 anode was investigated. The results show that addition of Ca to AZ31 anodes can result in not only grain refinement, but also a change in both morphology and volume fraction of the second phases. And grain refinement by Ca addition can be explained by the GRF mechanism. 0.4%Ca addition to as-cast AZ31 anode can increase the effective current capacity and current efficiency, and meet the requirements of magnesium sacrificial anode, but open circuit potential is lower than the nation standards. AZ31-0.4Ca anode will have a broad marketing application prospect.
ISSN:	1660-9336 1662-7482 1662-7482
DOI:	10.4028/www.scientific.net/AMM.431.42