On the polarisation and Mott-Schottky characteristics of an Fe-Mn-Al-Ni shape-memory alloy and pure Fe in NaCl-free and NaCl-contaminated Ca(OH)2,sat solution—A comparative study

Electrochemical polarization behavior and superelastic properties of a Fe–Mn–Al–Ni–Cr shape memory alloy

“…The first one was attributed to the dissolution of iron and manganese atoms in the corrosion pits along the martensite plates and the second one to the formation of a similar oxide layer consisting mainly of aluminum and nickel. [ 20,21 ]…”

“…The first one was attributed to the dissolution of iron and manganese atoms in the corrosion pits along the martensite plates and the second one to the formation of a similar oxide layer consisting mainly of aluminum and nickel. [20,21] To further investigate the reactions on the surface and the influence of chromium on the formation of the oxide layer EIS measurements have been conducted on a single crystalline condition for the FMAN-Cr alloy as well as the FMAN alloy. Figure 9 shows the EIS results depicted as Bode plots.…”

“…Data published so far indicate that FMAN behaves similarly to pure iron in a 5.0 wt% NaCl solution (pH 6–7) [ 20 ] as well as in a saturated Ca(OH) 2 solution (pH 12–13). [ 21 ] However, in contrast to pure iron, a single crystalline condition shows the formation of an unstable passive layer during polarization measurements in the NaCl solution. [ 20 ] Thus, to improve the corrosion properties of FMAN, a key objective for future investigations should be the stabilization of the passivating behavior.…”

Biogenic Mn2O3 activating peroxymonosulfate for phenanthrene removal in soil

“…The slope of the straight-line part of the M-S curve is normal, indicating that biogenic Mn 2 O 3 was the n-type semiconductor (Zhang et al 2019), corresponding to the stronger tend to transport electrons into the solution since the Fermi level of the n-type semiconductor is higher than that of the solution after soaking with the solution. Meanwhile, the M-S curve shows that the at-band potential (E fb ) of Mn 2 O 3 is lower than biogenic Mn 2 O 3 , indicating that Mn 2 O 3 has lower electron transfer ability than biogenic Mn 2 O 3 , so its catalytic e ciency is lower than that of biogenic Mn 2 O 3 (Mandel et al 2020).…”

Effect of Al Content on Abnormal Grain Growth and Superelasticity in Fe–Mn–Al–Cr–Ni Shape Memory Alloys with Near-Zero Temperature-Dependence of Transformation Stress

“…In addition, the Fe-Mn-Al-Cr-Ni alloys are expected to exhibit better corrosion resistance than the Fe-Mn-Al-Ni alloys. Recently, the corrosion behavior of quaternary Fe-Mn-Al-Ni in NaCl [54] and NaCl-contaminated Ca(OH) 2,sat solutions [55] was investigated. It has also been reported that the addition of Cr improves the anti-corrosion behavior of high-Mn TWIP steels [56].…”