Magnetostriction and corrosion resistance of Tb0.3Dy0.7(Fe1−Si )1.95 alloys

Passivity of Tb0·3Dy0·7Fe1·92in alkaline solution and its breakdown by chloride ions

“…Therefore, the current-time trend for 0?01M chloride solution comprised of an incubation transient period followed by an increasing trend indicating the pit formation and pit growth. The constant current value obtained in the case of 0?1M Cl 2 containing solution was y6 mA cm 22 , which was several orders higher than the passive current density in chloride free solution.…”

“…Its structural [10][11][12][13][14][15][16][17][18][19] and magnetic properties [17][18][19][20][21] are available. A preliminary study on corrosion behaviour of Tb 0?3 Dy 0?7 Fe 1?92 22 suggested corrosion mechanism similar to that of Nd-Fe-B magnetic material. A detailed investigation of the corrosion behaviour of Tb 0?3 Dy 0?7 Fe 1?92 23 and hydrogen effects on corrosion behaviour 24 has recently been concluded.…”

“…Cyclic potentiodynamic polarisation scans were conducted, beginning from 2250 mV with respect to open circuit potential (OCP) up to a vertex potential E v of 800 mV or up to a vertex potential corresponding to a predetermined threshold current density i t of 1 mA cm 22 , and then the scans were reversed to 2250 mV v. OCP at a rate of 1 mV s 21 .…”

Nd-Fe-B Magnets: The Gradient Change of Microstructures and the Diffusion Principle after Grain Boundary Diffusion Process

“…Diffusion increases the proportion of the RE-rich phase in the surface layer of the magnet, which leads to the increase of the surface defects (as show in Figure 7a) and the decrease of the corrosion resistance. The increase of diffusion depth decreases the grain boundary ratio, while the enrichment of Tb in the rare earth phase improves the wettability of the grain boundary and reduces the number of defects that reduces the potential difference between the main phase and the RE-rich phase, which greatly improves the corrosion resistance [25,26]. With the further increase of diffusion depth, the Tb content at grain boundary decreases, and its corrosion resistance decreases.…”

A Comparison of SCC Behaviors for Two States of Fe85Ga15 Alloys in a 3.5 wt % NaCl Solution

“…Environmental factors could affect a mechanical and structural stability in service, such as SCC [26][27][28][29][30][31]. In addition, the microstructure in the material could induce changes in the electrochemical behavior in certain environments [32][33][34][35]. The preparation and processing of the material seriously affect the mechanical and SCC performance, and thus the service (such as the microstructure and mechanical properties) and functional stability.…”