Development of knowledge base for understanding neo-magnet corrosion

DTI has reviewed corrosion mechanisms observed in neo-magnet corrosion based on literature studies and practical examples from the REEgain company partners. The primary material concern is the selective corrosion taking place along the boundaries of the Nd2Fe14B grains - in the Nd-rich precipitates. Our current focus is on studying corrosion accelerated by applying e.g. mechanical stresses or constant/varying magnetic fields during environmental exposure.

Caption: Corroded neo-magnet as seen in scanning electron microscopy. The corrosion attack is concentrated along the Nd2FeB-grain boundaries.

Contact: Nikolaj Zangenberg, nzg@teknologisk.dk, +45 7220 2494