Investigation of the Corrosion Behavior of Wire Arc Additively Manufactured Alloy 825

Additive manufacturing ensures the global adoption of zero-to-minimal waste and lean manufacturing systems. This is crucial for repairing, replacing, rebuilding, and rapidly producing components. The current study employs wire arc additive manufacturing (WAAM) with metal inert gas welding, which is affordable and versatile. The filler material used is Alloy 825, a highly corrosion-resistant alloy used extensively in the maritime and chemical sectors. The study compares the corrosion behavior of alloy 825 produced by the WAAM technique with that of wrought alloy 825. Electron backscatter diffraction analysis and hardness tests were also performed. Corrosion behavior was assessed using potentiodynamic polarization and electrochemical impedance spectroscopy. Wire arc additively manufactured alloy had a corrosion rate of 0.117 mmpy, while the wrought alloy had a corrosion rate of 0.066 mmpy. Tafel's extrapolation method computed corrosion current density and corrosion potentials. Electrochemical impedance spectroscopy studies were carried out using Bode impedance and phase angle plots. A scanning electron microscope examined the morphology, while energy-dispersive spectroscopy studied the chemical analysis of the corrosion region.

Automated summary

The study compares the corrosion behavior of alloy 825 produced by wire arc additive manufacturing (WAAM) with that of wrought alloy 825. The results show that the wire arc additively manufactured alloy has a higher corrosion rate.