Abstract
Adding in a metal hydride (MH) electrode diminishes the corrosion rate. Yttria dissolves in the electrolyte and then precipitates as hydroxide on the alloy surface. Alloy corrosion inhibition has been quantified for contents varying between 0 and 2 wt % in the negative electrode. The amount, structure, and morphology of corrosion products depend on the content of added in the MH electrode. A change in the effect was observed for 0.7 wt % It corresponds to a morphological and structural change in the corrosion scale. When the amount of is lower than or equal to 0.7 wt %, corrosion products with an -type composition are formed that adopt a structure similar to that of ( mixture of La, Ce, Nd, and Pr) and crystallize as hexagonal platelets. Below this limit, yttrium is incorporated in the corrosion scale as and strongly diminishes the corrosion kinetics of the alloy. In contrast, beyond 0.7 wt % of corrosion products are rich in yttrium: a -type composition adopts a structure similar to that of and crystallizes as spherical grains. For Y levels above 0.7 wt %, yttrium precipitates as between alloy particles and becomes less efficient as a corrosion inhibitor. © 2005 The Electrochemical Society. All rights reserved.
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