FTIR Measurements of Iron Oxides on Low Alloy Steel

Abstract

Well‐resolved FTIR spectra of iron oxide and iron carbonate corrosion scales are readily measurable with commercial instrumentation on otherwise untreated low alloy steel coupons. These spectra are relatable to the chemical history of the corrosion process. The absorption maxima of most of the 11 crystalline iron oxides and iron carbonate are sufficiently separated from one another to allow “fingerprinting” many of the films/scales. Exposing some of these films to vacuum drastically alters the position of the absorption maxima. Forming such scales into normalKBr pellets can also alter the absorption maxima, depending on the particular oxide composition.

Free‐Sustaining Three‐Dimensional S235 Steel‐Based Porous Electrocatalyst for Highly Efficient and Durable Oxygen Evolution

“…The unique 3D porousf rame structure is retained very well after these electrocatalytic measurements (Figures S4 aa nd S5 a). The FTIR absorption bands ( Figure 10) at ñ = 569, 717, and 792 cm À1 can be attributed to the stretching vibration of the metal-oxygen (FeÀO) bond, the FeÀOH mode, and the FeÀOÀHb ending vibrations of a-FeOOH, [78][79][80] respectively,w hich indicates that Fe is surrounded by oxygen. The peak that corresponds to Fe 2 Pi ss ignificantly reduced relative to that of the catalystp rior to the polarization experiments,w hich suggestst hat an ew active ironbased species is generated duringt he OERp rocess.…”

“…The FTIR spectroscopy resultso ft he 3D S235-P steel sample are in good agreement with these findings. The FTIR absorption bands ( Figure 10) at ñ = 569, 717, and 792 cm À1 can be attributed to the stretching vibration of the metal-oxygen (FeÀO) bond, the FeÀOH mode, and the FeÀOÀHb ending vibrations of a-FeOOH, [78][79][80] respectively,w hich indicates that Fe is surrounded by oxygen. In addition, the broad absorption band at ñ = 3403 cm À1 can be assigned to the OÀHs tretching vibration of the hydroxide speciesa nd physically adsorbed water.M oreover, the absorption bands at approximately ñ = 1347, 1498, and 1633 cm À1 may be caused by the OÀHa nd PÀ Ob ending vibrations of Fe-containing species.…”

Oxygen Evolution Catalyzed by Nickel–Iron Oxide Nanocrystals with a Nonequilibrium Phase

“…The strongest feature, observed at low energy, corresponds to modes associated with NiO (~450 cm -1 ), 67,68 and FeO (410 cm -1 ), and showed no change after 1 hour of irradiation. 69 The 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 previously reported for NiO that had been completely transformed from a cubic rock salt structure into a layered hydroxide structure. 57 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 4...…”

Adsorption and corrosion inhibiting effect of riboflavin on Q235 mild steel corrosion in acidic environments

“…Some of the peaks were modified, while some vanished. In 1 M HCl there is a shift from 1723 to 1696 cm À1 due to the C]O stretching [42,43], the bands associated with OeH/NeH [39,44] at 3209 shifts to 3320 cm À1 , the bands associated with CeN at 1002 vanished. The shift of C]C and CeO stretching frequencies from 1650 to 1636 cm À1 and from 1243 to 1083 cm À1 , respectively [42], suggests the adsorption of RF molecules on the corroding metal surface.…”