Martyna
@pwr.edu.pl
Department of Physical and Quantum Chemistry
Wroclaw University of Science and Technology
RESEARCH INTERESTS
hydrogen storage materials; corrosion; coatings; leaching; hydrogen diffusion coeficient
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Martyna Dymek, Jerzy Gęga, Marek Nowak, Mieczysław Jurczyk, and Henryk Bala
Elsevier BV
Rakia Dahsa, Martyna Dymek, Yassine Ben Belgacem, Jilani Lamloumi, Chokri Khaldi, and Henryk Bala
Elsevier BV
WISSEM ZAYANI
Wydawnictwo SIGMA-NOT, sp. z.o.o.
Martyna Dymek, Jerzy Gega, Piotr Pawlik, and Henryk Bala
Elsevier BV
Martyna Dymek, M. Nowak, M. Jurczyk and H. Bala
Martyna Dymek, Marek Nowak, Mieczysław Jurczyk, and Henryk Bala
Elsevier BV
Martyna Dymek, Marek Nowak, Mieczysław Jurczyk, and Henryk Bala
The Electrochemical Society
Martyna Dymek, Marek Nowak, Mieczyslaw Jurczyk, and Henryk Bala
Elsevier BV
M. Dymek and H. Bala
Springer Science and Business Media LLC
Henryk Bala and Martyna Dymek
Elsevier BV
Martyna Dymek, Beata Rozdzynska-Kielbik, Volodymyr V. Pavlyuk, and Henryk Bala
Elsevier BV
Henryk Bala, Martyna Dymek, Stefan Szymura, and Yuri M. Rabinovich
Trans Tech Publications, Ltd.
The present paper aims at explanation of the advantageous role of partial substitution of iron by cobalt in Nd-Fe-B magnet for distinct inhibition of mechanically assisted corrosion phenomena. The hydrogen uptake by Nd16Fe76B8 and Nd16Fe56Co20B8 sintered materials have been compared with the use of charge/discharge method in terms of the alloys corrosion behavior in strong alkaline solution. For initial cycles, the hydrogen discharge capacity of Co-containing alloy is 5-10 times lower than that for the Nd16Fe76B8 reference alloy. After 6-7 cycles both alloys reveal comparable hydrogen capacity. Also the plots of polarization curves testify to comparable corrosion resistance for both materials. The unusual resistance of Nd16Fe56Co20B8 sinter to pulverization should be ascribed to strong inhibition of hydrogen absorption at initial steps of corrosion process.
Martyna Dymek, Henryk Bala, Henryk Drulis, and Alicja Hackemer
Trans Tech Publications, Ltd.
Effect of small addition of tin (1.7 at.%) into LaNi4.5Co0.5 alloy on gas phase and cathodically charged hydrogen absorption ability as well as its corrosion resistance in 6M KOH solution is discussed. To reveal the effect of Sn doping three alloys have been selected: LaNi4.5Co0.5 (precursor), LaNi4.5Co0.5Sn0.1 and LaNi5 - as a parent compound. The room temperature p-C isotherms indicate to beneficial effect of Sn addition which causes decrease of H2 equilibrium pressure and does not limit atomic hydrogen solubility. Discharge capacities (Qdisch), exchange current densities of H2O/H2 system () as well as corrosion rates () have been determined for the tested alloys on the basis of cyclic galvanostatic measurements (at –0.5C/+0.5C rates). It has been shown that for N > 3 cycle the discharge capacity of LaNi4.5Co0.5 is ca twofold greater than that for LaNi5 reference. Addition of 1.7 at.% Sn into Co-containing alloy expands the discharge capacity by 30-40%. The Co containing alloys reveal twice as great exchange current densities of H2O/H2 system compared to LaNi5, however, Sn addition slightly decreases the , especially for latest cycles. The partial cobalt substitution for Ni accelerates alloy corrosion in alkaline solution, however, tin addition fully eliminates this effect.
Martyna Dymek, Henryk Bala, Alicja Hackemer, and Henryk Drulis
Elsevier BV
M. Dymek and H. Bala
Springer Science and Business Media LLC
Henryk Bala, Martyna Dymek, Lidia Adamczyk, Krystyna Giza, and Henryk Drulis
Springer Science and Business Media LLC
Henryk Bala, Martyna Dymek, and Henryk Drulis
Elsevier BV