John Hald

John Hald is a Professor in the Department of Civil and Mechanical Engineering at the Technical University of Denmark (DTU), specializing in Materials and Surface Engineering. His research is centered on the degradation and performance of advanced materials in extreme environments, particularly focusing on corrosion, oxidation, and microstructural evolution in high-temperature and aggressive chemical conditions.

His research interests span materials science, surface engineering, high-temperature corrosion, molten salts, energy materials, and metallic alloys. He investigates the behavior of materials such as stainless steels, nickel-based alloys, and protective coatings under operational stress relevant to energy technologies including solid oxide cells and molten salt reactors. His work integrates experimental characterization with practical engineering applications.

The recent publications highlight a strong trend in corrosion mechanisms in molten hydroxides, thermophysical properties of fluoride salts, and protective surface treatments for industrial applications. These studies employ techniques such as scanning electron microscopy, X-ray diffraction, and long-term environmental testing to understand material degradation and improve durability.

John Hald plays a significant role in academic mentorship, having served as main supervisor for multiple PhD projects at DTU. These include research on flowmeter materials, interconnects for solid oxide cells, and containment materials for molten hydroxides. While specific grant details are not listed, his supervision of externally and self-financed PhD projects indicates successful acquisition of research funding.

He is actively involved in collaborative research networks at DTU and beyond, contributing to interdisciplinary efforts in nuclear and energy engineering. He co-organized the Nuclear Engineering Educational Workshop in February 2025, reflecting engagement in academic community building.