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All sourcesNASA NTRSDOE OSTI
DOE OSTI2025

Spatial mapping of the localized corrosion behavior of a magnesium alloy AZ31B tungsten inert gas weld

Sections of a magnesium alloy, AZ31B, joined with tungsten inert gas (TIG) welding, were examined with scanning electrochemical microscopy (SECM) and scanning Kelvin probe force microscopy (SKPFM) to investigate corrosion mechanisms by correlating observed corrosion behavior with weld-affected microstructural variations. Insight into the changing nature of the galvanic couples between weld zones and at localized microgalvanic sites were investigated using SECM and SKPFM to map both electrochemically active regions and Volta potential differences across the weld-affected zones. The formation of an Al-Zn solidification network in the fusion zone (FZ) at and near the TIG weld epicenter differs from the outer heat-affected zone (HAZ), where intermetallic particles (IMPs) are the notable secondary phase from the magnesium matrix. These microstructures were mapped with SKPFM before and after brief exposure to a salt solution, revealing micro-galvanic couples as the main driving force to corrosion initiation and propagation within each zone. The IMPs and Al-Zn solidification network act as strong cathodes and govern the corrosion processes. The galvanic coupling and evolution of the intrinsic corrosion behavior between the weld zones is explained by monitoring the hydrogen evolution reaction (HER) with SECM over time. Anodically induced cathodic activation is confirmed for this welded material, as micro-galvanic couples between microstructural features are found to transition over time to broad electrochemically active areas within the weld-affected zones, resulting in polarity reversal as time of exposure proceeds.

Anodically induced cathodic activation↗
DOE OSTI2020

Materials Data on Al3Zn by Materials Project

Al3Zn is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Zn is bonded to twelve equivalent Al atoms to form ZnAl12 cuboctahedra that share corners with twelve equivalent ZnAl12 cuboctahedra, edges with twenty-four equivalent AlAl8Zn4 cuboctahedra, faces with six equivalent ZnAl12 cuboctahedra, and faces with twelve equivalent AlAl8Zn4 cuboctahedra. All Zn–Al bond lengths are 2.84 Å. Al is bonded to four equivalent Zn and eight equivalent Al atoms to form AlAl8Zn4 cuboctahedra that share corners with twelve equivalent AlAl8Zn4 cuboctahedra, edges with eight equivalent ZnAl12 cuboctahedra, edges with sixteen equivalent AlAl8Zn4 cuboctahedra, faces with four equivalent ZnAl12 cuboctahedra, and faces with fourteen equivalent AlAl8Zn4 cuboctahedra. All Al–Al bond lengths are 2.84 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al2Zn by Materials Project

ZnAl2 is alpha La-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Zn is bonded to six equivalent Zn and six equivalent Al atoms to form ZnAl6Zn6 cuboctahedra that share corners with six equivalent ZnAl6Zn6 cuboctahedra, corners with six equivalent AlAl9Zn3 cuboctahedra, edges with six equivalent ZnAl6Zn6 cuboctahedra, edges with eighteen equivalent AlAl9Zn3 cuboctahedra, faces with six equivalent ZnAl6Zn6 cuboctahedra, and faces with twelve equivalent AlAl9Zn3 cuboctahedra. All Zn–Zn bond lengths are 2.83 Å. All Zn–Al bond lengths are 2.82 Å. Al is bonded to three equivalent Zn and nine equivalent Al atoms to form AlAl9Zn3 cuboctahedra that share corners with three equivalent ZnAl6Zn6 cuboctahedra, corners with nine equivalent AlAl9Zn3 cuboctahedra, edges with nine equivalent ZnAl6Zn6 cuboctahedra, edges with fifteen equivalent AlAl9Zn3 cuboctahedra, faces with six equivalent ZnAl6Zn6 cuboctahedra, and faces with twelve equivalent AlAl9Zn3 cuboctahedra. There are six shorter (2.83 Å) and three longer (2.85 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗