Title :
Corrosion characteristics of Nd2Fe14-xNixB permanent magnets
Author :
Bala, H. ; Szymura, S. ; Wyslocki, J.J.
Author_Institution :
Inst. of Gen. Chem., Tech. Univ., Czestochowa, Poland
fDate :
9/1/1990 12:00:00 AM
Abstract :
The influence of nickel additions in Nd2Fe14-x NixB (x=0, 5, 7, 10, 14) magnets on the kinetics and mechanism of electrochemical corrosion in 0.5 M H2 SO4 and Na2SO4 solutions was determined on the basis of potentiokinetic polarization curves and corrosion rates in the passive and strong cathodic range. It is shown that the replacement of part of the iron with nickel causes a strong decrease in the acid corrosion rate of the alloys tested, whereas the additions of nickel degrade the behavior of the alloy in the passive range and make it easier to hydrogenate the alloy at strong cathodic polarizations, leading to mechanical degradation of the alloy surface as well
Keywords :
boron alloys; corrosion; ferromagnetic properties of substances; iron alloys; neodymium alloys; nickel alloys; permanent magnets; H2SO4; Na2SO4; Nd2Fe14-xNixB; acid corrosion rate; cathodic range; corrosion rates; electrochemical corrosion; kinetics; mechanical degradation; permanent magnets; potentiokinetic polarization curves; surface; Corrosion; Degradation; Iron alloys; Kinetic theory; Lead; Magnets; Neodymium; Nickel alloys; Polarization; Testing;
Journal_Title :
Magnetics, IEEE Transactions on
