scholarly journals Correlation between Magnetic Properties and Corrosion Resistance of SmCo5/α-Fe Nanocomposite Magnet

2019 ◽  
pp. 4318-4326 ◽  
Author(s):  
Qiong Wu ◽  
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Nanocomposite Magnet

Effect of Electrolyte Composition on Corrosion Resistance in Nickel Plating Process for Coating Bonded Magnet PrFeB

2014 ◽  
Vol 896 ◽  
pp. 245-248 ◽  
Author(s):  
Candra Kurniawan ◽  
Hayati M.A. Sholihat ◽  
Kemas Ahmad Zaini Thosin ◽  
Muljadi ◽  
Prijo Sardjono
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Nickel Coating ◽  
Electrolyte Composition ◽  
Nickel Metal ◽  
Sem Images ◽  
Average Value ◽  
Immersion Corrosion ◽  
Bonded Magnet

Despite of its excellence magnetic quality, one of the critical properties of PrFeB based permanent magnet is a low corrosion resistance so it can be oxidized easily which can reduce its magnetic properties. In this study, Nickel coating has been performed for bonded PrFeB magnet by the electroplating method using Nickel-Watts bath-type as the electrolyte to improve the corrosion resistance. The varying amount of the electrolyte compounds used to have the optimized composition indicated by the corrosion resistance measurement. The solution composition used was NiSO4 (230-380 g/L), NiCl2 (30-60 g/L), and H3BO3 (30 and 45 g/L) with a fixed value of other parameters. Characterization used including the immersion corrosion test, microstructure analysis, and magnetic properties. Based on the corrosion rate measurement, the highest corrosion resistant of Nickel coated PrFeB magnet achieved from the electrolyte composition of NiSO4: NiCl2: H3BO3 = 380: 60: 30 g/L with a plating time and current density (J) of 60 minutes and 40 mA/cm2 respectively. The corrosion rate data showed that the Nickel metal coating can improve the corrosion resistance of bonded PrFeB magnet up to 29 times than of the substrate. The SEM images showed that the thickness of the Nickel coating on the optimum electrolyte composition was in average value of 35.1 µm. The overall samples has a magnetic remanence value (Br) reached ≥ 6 kG, so it has enough properties to be applied in devices such as generators and electric motors.

Improvement of magnetic properties and corrosion resistance of NdFeB magnets by intergranular addition of MgO

2008 ◽  
Vol 461 (1-2) ◽  
pp. 351-354 ◽  
Author(s):  
Wenjian Mo ◽  
Lanting Zhang ◽  
Aidang Shan ◽  
Lijun Cao ◽  
Jiansheng Wu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Ndfeb Magnets

Effect of Boron on Magnetic Properties and Corrosion Resistance of High Energy Magnets

2009 ◽  
Vol 79-82 ◽  
pp. 1043-1046 ◽  
Author(s):  
L.Q. Yu ◽  
Y.P. Zhang ◽  
Q.T. Fu
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Stoichiometric Composition ◽  
High Energy ◽  
Easy Plane ◽  
Main Phase ◽  
High Energy Density ◽  
Content Increase ◽  
Rich Phase

Element boron played an important role on magnetic properties and corrosion resistance of high energy density NdFeB products. The magnets were prepared by traditional powder metallurgy technique. It was found that with addition of 5.53 % B there was easy-plane phase formed. It owned not only lower remanence Br and coercivity iHc, but also poor corrosion resistance of magnet. As B content increase, the magnetic properties improved greatly, and obtained better properties at a content 5.7-5.87 % B. As increased B content further, superabundance B element formed too much B rich phase and led to Br decrease. Volume percent of phases calculated by theory formula, with the consumption of 0.1 % Nd oxided, it can be found that as B content increased from 5.53 %, the volume of main phase increased and easy-plane type Nd2Fe17 phase decreased in magnet, which resulted in Br, iHc increase. As B content increased higher than 5.82 %, more B rich phases formed which well isolated main phase grains and resulted in iHc increase. But too much B rich phase would decrease main phase proportion and lead to Br decrease. Examination of microstructure of magnets showed as B content increased from 5.53 % to 6.16 %, average matrix grain size was enlarged from 6.5µm to 8.2µm, and the proportion of sharp shape grains relatively increased as well. Abnormal grain growth was easily happened at higher B content. In addition, the decreased squareness Hk/iHc of magnets at higher B content also suggested inconsistent distribution of grain size and shape. Corrosion current density measured by polarization test for magnet with addition of 5.76 % B, near stoichiometric composition of Nd2Fe14B, owned lowest value and best corrosion resistance. Formation of Nd2Fe17 phase (lower B content) or B rich phase (higher B content) was not benefit for corrosion resistance improvement.

Magnetic Properties and Magnetic Viscosity of Pr4Fe76Co10B6Nb3Cu1 Nanocomposite Magnet

2008 ◽  
Vol 52 (5) ◽  
pp. 1415-1418 ◽  
Author(s):  
N. D. The ◽  
N. H. Hai ◽  
H. D. Anh ◽  
V. V. Hiep ◽  
L. V. Vu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Nanocomposite Magnet ◽  
Magnetic Viscosity

MECHANICAL BEHAVIOR OF BULK GLASSY Fe65.5Cr4Mo4Ga4P12C5B5.5

2003 ◽  
Vol 806 ◽  
Author(s):  
Mihai Stoica ◽  
Nicolle Radtke ◽  
Jürgen Eckert ◽  
Stefan Roth ◽  
Germán Alcalá ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Fracture Strain ◽  
Nominal Composition ◽  
Compression Tests ◽  
Soft Magnetic ◽  
Copper Mold Casting ◽  
Mold Casting ◽  
Different Shapes ◽  
Better Than

ABSTRACTThe bulk amorphous Fe-based alloy with the nominal composition Fe65.5Cr4Mo4Ga4P12C5B5.5 was obtained by copper mold casting in different shapes: cylindrical rods with diameters up to 2.5 mm and discs with 10 mm diameter and 1 mm thickness. This alloy exhibits good soft magnetic properties. Using electrochemical investigations we found that the corrosion resistance of this alloy is better than that of usual FeSi steel used for magnetic applications. Beside magnetic properties and corrosion resistance, this alloy exhibits also good mechanical properties. These were investigated by compression tests, nanoindentation and by an ultrasonic technique. The Young's modulus E was found to be around 160 GPa, the yield strength σy is around 2.3 GPa and the fracture strength σf is around 3.23 GPa, together with an elastic strain εe= 1.5% and a fracture strain εf= 2.3%. The hardness was found to be around 10 GPa.

scholarly journals Mechanical, magnetic properties and corrosion resistance of hybrid bonded magnet NdFeB - BaFe12O19

2019 ◽  
Vol 1191 ◽  
pp. 012048
Author(s):  
Muljadi ◽  
Ramlan ◽  
Prijo Sardjono ◽  
Dedi Setiabudidaya ◽  
Fakhili Gulo
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Bonded Magnet

Improvement of corrosion resistance and magnetic properties of FeCoNiAl0.2Si0.2 high entropy alloy via rapid-solidification

2020 ◽  
Vol 122 ◽  
pp. 106778 ◽  
Author(s):  
Chen Chen ◽  
Hang Zhang ◽  
Yanzhou Fan ◽  
Ran Wei ◽  
Weiwei Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Rapid Solidification ◽  
High Entropy Alloy ◽  
High Entropy
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