Corrosion behavior of Al-Zn-In sacrificial anode alloys produced by conventional casting and semi-solid metal casting processes
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Publication Details
Author list: Puridetvorakul C., Poolthong N., Tareelap N.
Publisher: Trans Tech Publications
Publication year: 2017
Volume number: 751 KEM
Start page: 101
End page: 106
Number of pages: 6
ISBN: 9783035710823
ISSN: 1013-9826
eISSN: 1662-9795
Languages: English-Great Britain (EN-GB)
Abstract
A challenge in producing a sacrificial anode through conventional casting method is that the alloying elements in casting segregate during solidification, which further cause non-uniform anode corrosion and reduce anode performance. In this paper, we investigated the performance of Al-5Zn-0.02In anode produced by conventional casting compared with semi-solid casting technique. The performance of conventional cast anode and semi-solid cast anode was measured in terms of anode potential, current capacity, consumption rate and anode efficiency in 3.5% NaCl solution for 14 days. It was found that the microstructure of the conventional cast anode exhibited dendrites and coarse grains and the corrosion was of pitting mode. In contrast, the semi-solid cast anode presented fine grains without any dendrites. The corrosion attacked mainly at the grain boundaries and less on the matrix. Surprisingly, the conventional cast anode provide approximately 10% higher efficiency than that of semi-solid cast anode. ฉ 2017 Trans Tech Publications, Switzerland.
Keywords
Al-Zn-In sacrificial anode, Anode efficiency, Corrosion morphology, Current capacity, Semi-solid metal casting
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