Abstract
The effect of hydrogen on the corrosion behavior of rare-earth-based magnetostrictive material was studied after cathodic charging of hydrogen. The aqueous solutions used for understanding electrochemical behavior were NaCl and 0.01 N , in freely aerated and deaerated conditions. The severity of hydrogen attack in the presence of chloride ions increased with increasing hydrogen charging duration. Terraced and cleavagelike faceted features were evident on the surfaces after hydrogen charging and they were related to hydrogen embrittlement of the material. The destabilizing effect of chloride ions on the surface films, resulting in increased hydrogen uptake and consequent lowering of corrosion resistance, was verified by testing in chloride-free 0.01 N environment in both freely aerated and deaerated conditions. The material was more tolerant to charged hydrogen in the absence of chloride ions. Protective surface film formation in 0.01 N solution resulted in improved corrosion resistance of Terfenol-D compared to that in NaCl solution.
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