ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Two NdFeB materials were selected for study. The first is referred to as a base or standard alloy with a composition of (NdDy)15FebalAl0.7B6, and the second is similar, Nd13.5Dy1.5FebalCo5V4AlB8, but alloyed with Co and V. The corrosion behavior of magnets made with these two materials is compared by two different techniques, autoclave testing at elevated temperature and pressure for 96 h, and dc electrochemical testing in an aqueous electrolyte. For the former, the base alloy exhibited poor corrosion resistance with a weight loss on the order of 270 mg/cm2. Significantly, the Co-V-treated samples yielded excellent corrosion resistance, showing no change in weight. Two types of electrochemical tests were performed on electrodes of each material, potentiodynamic polarization and constant potential in sodium sulfate solutions at pH from 1.5 to 4.4. Consistent with the autoclave tests, electrochemical experiments show lower currents for the Co-V alloys.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.352586
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