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Corrosion resistance of NdDyFeB basic alloys = Korozijska obstojnost zlitin NdDyFeBKobe, Spomenka ; Vehovar, Leopold ; Saje, BorisNd-Dy-Fe-B-X (X=Zr,Hf) alloys were exposed to severe corrosion conditions and the corrosion rates were followed by various techniques (electrochemistry, Tafel extrapolation mehod). The weight loss ... was measured over a period of 10 weeks in a wet corrosion chamber. Corrosion products were analysed using X-ray diffraction and the microstructures were investigated by optical microscopy and on SEM-EDS. In agressive mesia, such as diluted NaCl or ▫$H_2So_4$▫, the differences between the corrosion rates were small. The lowest potential difference between the anodic phase (corrosion products) and the matrix, acting as cathode, was observed in Nd-Dy-Fe-B-Zr alloys. Corrosion rates in fresh water were 0,30 mm/year for Nd-Dy-Fe-B alloy and 0,02 mm/year for Nd-Dy-Fe-B-Zr alloy. The same trend was shown on samples exposed to conditions of simulated condensed atmospheric humidity. The highest cumulative weight loss occured with pure Nd-Dy-Fe-B alloys and the lowest with the alloy improved by ▫$ZrO_2$▫ addition. The corrosion rates for three different alloys were 0,089 mm/year for Nd-Dy-Fe-B alloy, 0,072 mm/year for Nd-Dy-Fe-B-Hf alloy and 0,063 mm/year for Nd-Dy-Fe-B-Zr alloy.Source: Kovine zlitine tehnologije = Metals alloys technologies. - ISSN 1318-0010 (Let. 30, št. 6, nov.-dec. 1996, str. 545-549)Type of material - article, component partPublish date - 1996Language - englishCOBISS.SI-ID - 3873831
Author
Kobe, Spomenka |
Vehovar, Leopold |
Saje, Boris
Topics
korozija |
trajni magneti |
Nd-Fe-B zlitine |
Nd-Fe-B alloys |
permanent magnets |
corrosion
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source: Kovine zlitine tehnologije = Metals alloys technologies. - ISSN 1318-0010 (Let. 30, št. 6, nov.-dec. 1996, str. 545-549)
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Database name | Field | Year |
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Kobe, Spomenka | 04355 |
Saje, Boris | 10570 |
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