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The purpose of this study is to investigate the corrosion behavior of Ti-Gd alloys that were fabricated as a neutron absorbing material for storage of spent nuclear fuel in a boric acid solution at 50 °C. The electrochemical corrosion current and weight loss of the alloys increased with increasing Gd content. Gd-rich particles distributed in the Ti matrix were preferentially dissolved in the solution by a micro-galvanic effect with the cathodic Ti matrix. Oxide films grown on the alloys revealed a lower charge transfer resistance, lower electrical resistance, and higher donor density compared to those of pure Ti.
•Corrosion behavior of neutron absorber Ti-Gd alloys was studied in boric acid water.•The corrosion rates of the alloys increased with increasing Gd content.•Gd-rich particles were distributed in the Ti-matrix along the rolling direction.•The anodic particles were dissolved by a galvanic effect with the cathodic matrix.•The alloys showed a low film and charge transfer resistance, and high donor density.