The Role of Intermetallics on the Corrosion Initiation of Twin Roll Cast AZ31 Mg Alloy

S. Pawar; X. Zhou; G. E. Thompson; G. Scamans; Z. Fan

doi:10.1149/2.0291509jes

journal article·2015

The Role of Intermetallics on the Corrosion Initiation of Twin Roll Cast AZ31 Mg Alloy

S. Pawar, X. Zhou, G. E. Thompson, G. Scamans, Z. Fan

Journal of The Electrochemical Society· Volume 162· Issue 9

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Source abstract

Abstract

The micro-galvanic coupling between the microconstituent phases and the α-Mg matrix in the twin roll cast AZ31 Mg alloy sheet of 6 mm thickness has been investigated using scanning Kelvin probe force microscopy (SKPFM) and electron microscopy. The β-Mg 17 (Al,Zn) 12 phase at the interdendritic spaces, along with the Al 8 Mn 5 particles with rosette/flower-shaped morphologies and Fe-particles have been observed in the surface/near-surface region of the alloy sheet. Volta potential differences exhibited by the microconstituents relative to the α-Mg matrix followed the order of Fe-particles > Al 8 Mn 5 intermetallics > β-Mg 17 (Al,Zn) 12 phase. The susceptibility to localized corrosion initiation by the intermetallics predicted from the SKPFM was confirmed by immersion testing conducted in naturally aerated 3.5% NaCl solution at ambient temperature.

Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloys

OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Aluminum Alloy Microstructure Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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