High temperature oxidation behaviors of Ir-Ni-Ta-(B) metallic glass

Effect of acid proticity on the thermodynamic parameters of charge transfer resistance in corrosion and passivation of nickel based glass alloy

“…By similarity of some recent studies on the viscosity of liquid state which find that the Arrhenius temperature ( T A ) is strongly correlated to the boiling temperature ( T b ) 29 – 31 , and regarding that the BMGs are in solid state, we can assume that the Arrhenius temperature (Table 1 ) is probably in causal correlation with the corresponding glass transition temperature ( T g ) which is strongly correlated with the melting point ( T m ) 14 , 26 , 27 . This allows us in the future to make certain predictions, estimations and comparisons of different BMGs features.…”

“…Generally, in case of clear deviation to the Arrhenius behavior, experimenters try to classify their results in the super-Arrhenius behavior or the sub-Arrhenius one 22 or apply the Vogel–Fulcher–Tammann-type equation (VTF or VFT) 14 , 23 – 28 especially when there is some divergence of experimental values at low temperature.…”

“…In addition, regarding the suggested pseudo-hyperbolic behavior in previous work 22 where the divergence of the variation of charge transfer resistance ( R ct ) for low temperatures (Fig. 6 of 22 ) exhibits a kind of vertical asymptote, we propose to explore the Vogel–Fulcher–Tammann-type equation (VTF) which is characterized by a vertical asymptote and is used when the test of Arrhenius behavior fails 14 , 23 – 28 . In the case of the nonlinear behavior, it is found that the temperature dependence of charge transfer resistance can be physically fitted with the frequently VTF-type equation 14 , 23 – 28 expressed as follows: where A 0 and B 0 are optimal constants and T 0 is the Vogel temperature.…”

“…In a recent research, Han et al 14 studied the high temperature oxidation behaviors for Ir 35 Ni 25 Ta 40 and Ir 35 Ni 20 Ta 40 B 5 ( wt %) metallic glasses that become the optimal candidates for the molding materials of optical devices. It was found that Ir–Ni–Ta-(B) MGs display good oxidation resistance and there appears a unique four-layer oxide micro-structure on the surface and the natural oxide Ta 2 O 5 will be transformed into TaO 2 with the gradual increase of temperature after approaching T g of Ir–Ni–Ta-(B) MGs 14 . In another study, the corrosion behavior of Ni 62 Nb 33 Zr 5 bulk metallic glasses (BMGs) after annealing treatment (AT) at different crystallization temperatures and cryogenic treatment (CT) at –100 °C are experimentally investigated 15 .…”

“…Therefore, we will introduce a new concept of current quantities after considering the dependence with temperature of the Arrhenius and thermodynamic parameters. Moreover, the novel application of the Vogel–Fulcher–Tammann (VTF) model 14 , 23 – 28 on corrosion reveals new physical meanings of the corresponding parameters. Also, the effect of the proton numbers, of the used polyacids, on the thermodynamic parameters is modeled with logarithm form.…”