Electrochemical behavior of Ni3Al-based intermetallic alloys in NaOH

Applications of Ni3Al Based Intermetallic Alloys—Current Stage and Potential Perceptivities

“…The Ni 3 Al alloys are mostly superior to the commercial alloys, especially in the field of high-temperature properties, in an oxidizing and carburizing environments. The most attractive properties of the Ni 3 Al intermetallics include: a high tensile and compression strength at temperature of 650 ÷ 1100 °C (Figure 1a) [5,9,12,19,20,21,42,43];an increase of flow stress with increasing temperature—an anomalous positive temperature dependence of the yield strength (at 600–900 °C) is a characteristic feature of the Ni 3 Al phase and its alloys [1,2,5,11,12,19,21,43];a high corrosion resistance in oxygen and carbon enriched atmospheres up to 1100 °C, due to a formation of a continuous surface alumina layer (see Table 1) [5,9,12,19,20,21,43,44,45];a high corrosion resistance in organic acids (oxalic and acetic acids), bases (sodium and ammonium hydroxides), and sodium-chloride solution [44,46,47,48,49,50];a high fatigue strength resulting from the elimination of stress concentrations on the second phase particles (e.g., carbides) [9,19,21];a high creep resistance (which is also affected by a grain size) [9,10,12,19,21,42,51,52];an excellent high temperature (above 600 °C) wear resistance [9,12,21,43,44,…”

“…a high corrosion resistance in organic acids (oxalic and acetic acids), bases (sodium and ammonium hydroxides), and sodium-chloride solution [44,46,47,48,49,50];…”

Tribological behavior of Ni3Al alloy at dry friction and under sea water environment

“…It is reported that the corrosion resistance of nickel aluminide in various corrosive media is similar or superior to that of nickel alloys or stainless steels [22]. In strong alkali solution, polarization resistance indicated that Ni 3 Al had more positive free corrosion potential and lower corrosion current than Ni and Ti and exhibited a wider passive region [23].…”

Electrochemical Behavior and Stability of Cu-Al-Ni Alloys in NaOH Solutions

“…The thickness of the passive layer increases with time, especially in stagnant solutions. This leads to a shift of the steady state potential in the positive region [31]. The corrosion parameters i.e.…”

“…The potential scan in the negative direction shows two cathodic peaks, c ii , at −0.36 V and, c i , at −0.68 V. The cathodic peak (c ii ) is attributed to the electro-reduction of Cu(OH) 2 while the second peak (c i ) is related to the electroreduction of Cu 2 O [31]. Figure 2c presents the cyclic voltammograms for Cu-Al-5Ni.…”