Electrochemical Deposition of Thick Iron Oxide Films on Nickel Based Superalloy Substrates

Mechanism and kinetics of magnetite oxidation under hydrothermal conditions

“…Some prior studies have reported that the transformation between magnetite and maghemite proceeds via the solid state diffusion of ions. This process could involve the inward diffusion of oxygen or, as is more commonly accepted, the outward diffusion of ferrous ions to produce a Fe 3Àx O 4 solid solution or a core/shell structure made of magnetite/maghemite 19,34,42 with the oxidation of ferrous ions at the particle surfaces by O 2 . 43 Iyengar et al 1 recently provided direct evidence for this core/ shell structure using techniques such as transmission electron microscopy.…”

Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

“…On the contrary, the second reduction wave between −1.20 and −1.30 VSCE seems to be due to a two-electron process corresponding to the reduction of Fe(II) to Fe [22][23][24]. In this work, the magnetite film was electrodeposited on Alloy 690 substrate in the Fe(III)-TEA solution at the potential of −1.05 VSCE (first reduction wave region) for 3600 s. Figure 2 shows the SEM images of the magnetite electrodeposited on the Alloy 690 substrate.…”

“…Recently, Kothari et al [21] have shown that magnetite is easily produced by electrodeposition on a stainless steel substrate in Fe(III)-triethanolamine (TEA) solution at 60-80 °C. Goujon et al [22] characterized magnetite films electrodeposited on the Ni-based alloy and established the optimal temperature and agitation condition for electrodeposition growth of magnetite films in the Fe(III)-TEA solution.…”

Simulating Porous Magnetite Layer Deposited on Alloy 690TT Steam Generator Tubes

“…In recent years, Switzer and others have modified the Fe(III)-TEA solution agent to more easily deposit magnetite on stainless steel [12], Au [13], and Ni substrates [14]. Furthermore, Goujon et al [15,16] established the optimal electrodeposition conditions to produce thick and dense magnetite films on nickel-based alloys in an Fe(III)-TEA solution. Duan et al [17] presented a systematic study regarding factors affecting magnetite electrodeposition, such as the concentration of Fe(III) ions as well as the deposition temperature and time in the Fe(III)-TEA solution.…”