HYDROGEN SOLUBILITY IN AMORPHOUS AND CRYSTALLINE MATERIALS

Electrochemical hydrogen permeation tests were performed in an electro lyte of 0.1 N NaOH at 313 K with the objective of studying the hydroge n solubility in metallic amorphous and crystalline materials. Samples were prepared from the amorphous metallic alloys Ni81P19 and Fe40Ni38M o4B18 and crystalline pure nickel and palladium, as well as low carbon steel. It was shown that the hydrogen solubility in Ni81P19 amorphous alloy is much bigger than in the Fe40Ni38Mo4B18 glassy alloy and in t he crystalline pure nickel, palladium and low carbon steel. Also that a terminal hydrogen solid solubility of 1232.0+/-34.1 mol H m(-3) is a ttained in the Fe40Ni38Mo4B18 amorphous alloy by forming a hydride pha se, while, under the same conditions, the Ni81P19 glassy alloy dissolv es 11645.0+/-41 mol H m(-3) as a partial hydrogen solid solubility wit hout transforming into hydride. The cathodic hydrogen generation poten tial used in the hydrogen permeation tests was shown to influence the hydrogen permeation kinetics. (C) 1998 International Association for H ydrogen Energy.