Abstract
Laser powder bed fusion (LPBF) processed, rare earth element Sc modified Al–Mg–Sc–Zr alloy has gained worldwide interest due to its excellent mechanical properties and promising prospects for aerospace applications. This chapter focuses on the corrosion resistance and underlying mechanisms of LPBF-processed Al–Mg–Sc–Zr alloy. The relationship of processing parameters, scanning strategy, postprocessing, and corrosion characteristics of different planes are studied in detail. It shows that the corrosion resistance is affected by the scanning strategy, where a superior corrosion resistance (icorr=6.82×10−6A/cm2) is generated at a moderate-level scanning island size of 2.4mm. The direct LPBF-fabricated Al–Mg–Sc–Zr specimen possesses a superior corrosion resistance than the heat-treated specimen. The building plane (XY-plane) exhibits a superior corrosion resistance with a lower current density compared to the building direction plane (XZ-plane). These findings further facilitate process optimization and engineering applications of laser additive manufacturing of high-performance Al–Mg–Sc–Zr alloy.
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