Evolution of Hydrogen from Ferrous Hydroxide

Evans, U. R.; Wanklyn, J.N.

doi:10.1038/162027b0

Cited by 42 publications

(17 citation statements)

References 1 publication

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“…Evidence for this viewpoint is provided by the hydrolysis property of Na-tochilinite, which releases Fe 2+ ions in dilute aqueous solutions spontaneously, and by the non-hydrolysis property of FeMgAl tochilinite (Peng et al, 2007). Thus, some of the magnetite in the matrix of CM carbonaceous chondrites may have been formed by Fe 2+ ions released from previously formed unstable phases like tochilinite and TSI when the reducing strength of the environment of the CM chondrite parent body decreased (Evans and Wanklyn, 1948;Shipko and Douglas, 1956;Schrauzer and Guth, 1976). As for pyrrhotite, some of them may have been formed from the mackinawite-like phase Fe 1Àx S dissociated from some unstable tochilinites and TSI and/or from mackinawite produced by the reaction of Fe 2+ ions released from previously formed tochilinites and TSI and S 2À ions.…”

Section: Applications To Meteoriticsmentioning

confidence: 86%

“…86-1346), while the N 2 H 4 IC remained unchanged. If we assume that elemental Fe first hydrolyzed to form Fe(OH) 2 , then Fe(OH) 2 transformed into Fe 3 O 4 in this reaction (Evans and Wanklyn, 1948;Shipko and Douglas, 1956;Schrauzer and Guth, 1976), we may reach a conclusion that aqueous Fe 2+ ions and Fe(OH) 2 could not reduce the intercalated N 2 H 4 into NH 3 .…”

Section: Nh 3 Icmentioning

confidence: 97%

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An experimental study on the preparation of tochilinite-originated intercalation compounds comprised of Fe1−xS host layers and various kinds of guest layers

Peng¹,

Xi²,

Zhong³

et al. 2009

Geochimica et Cosmochimica Acta

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Section: Applications To Meteoriticsmentioning

confidence: 86%

Section: Nh 3 Icmentioning

confidence: 97%

An experimental study on the preparation of tochilinite-originated intercalation compounds comprised of Fe1−xS host layers and various kinds of guest layers

Peng¹,

Xi²,

Zhong³

et al. 2009

Geochimica et Cosmochimica Acta

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“…All these models are based on the previous one proposed by Evans 1 for the corrosion of iron in caustic solution and assume a duplex microstructure for the growing corrosion scale combined with assumptions about transport phenomena, 2 scale dissolution 3,4 and pore blocking and precipitation. 1,5 The most recent model proposed by Gardey 6,7 for the corrosion of Alloy 600 combines the models of Evans, 1 Robertson 3,4 and Lister 5 and considers the growth of a corrosion scale consisting of three different layers, the innermost acting as a diffusion barrier and the outermost being porous.…”

Section: Introductionmentioning

confidence: 99%

Analysis and TEM examination of corrosion scales grown on Alloy 690 exposed to pressurized water at 325 °C

Carrette¹,

Lafont²,

Chatainier³

et al. 2002

Surface & Interface Analysis

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Corrosion scales grown on Alloy 690 during exposure to pressurized water were examined and analysed by SIMS, scanning electron microscopy (SEM), cross-sectional transmission electron microscopy (XTEM), XPS and x-ray diffraction at grazing incidence. All the corrosion tests were performed in pure water on spark-machined and 1 µm polished specimens at a temperature of 325• C and a pressure of 155 bar. This surface finish results in the formation of a highly defective and thin perturbed zone similar to the standard surface finish of tubes used in pressurized water reactors. Two different testing devices were used: a static autoclave made of stainless steel and a recirculating autoclave made of titanium alloy. Scale thicknesses deduced from XTEM, XPS and SIMS are in good agreement; the average value is ∼50 nm for an exposure of 2160 h. The microstructure of these scales cannot be considered as duplex, as is usually described in the open literature. The scale is formed of a rather continuous and uniform internal Cr-rich thin layer and an external layer, the composition, morphology and microstructure of which depend on the test conditions and test duration. For example, scales grown in the static autoclave contain higher concentrations of Fe and Ni than scales grown in the recirculating titanium alloy autoclave.

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“…The curves clearly reveal that u increases as the temperature increases and decreases as the concentration of CuCl 2 increases. Reaction (2) which is called the Schikorr reaction [26] has been extensively studied [27,28]. Ferrous hydroxide, Fe(OH) 2 , decomposes rapidly above 100 C [29], but relatively slowly at lower temperatures.…”

Section: Retention Coefficientmentioning

confidence: 99%

Kinetics of high temperature corrosion of a low Cr‐Mo steel in aqueous NaCl Solution

Bayoumi¹

2007

Materials & Corrosion

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The kinetics of corrosion of a low Cr-Mo steel alloy were studied over the temperature range of 75-250 C in 1 m NaCl in absence and in presence of various levels of contamination with CuCl 2 . Corrosion rates, weights of corrosion product (magnetite) film and total (integral) weight loss of the alloy over exposure times from 1 up to 480 h were measured. The corrosion rate decreases rapidly with time, before it levels off at longer time, indicating the formation of a protective corrosion product film. The ability of the alloy to retain an adherent corrosion product (magnetite) film was expressed in terms of a retention coefficient. This was found to increase with temperature and exposure time and to decrease with the level of contamination with CuCl 2 . This effect of temperature was attributed to the improvement of the crystallinity of the corrosion product. On the other hand, the effect of CuCl 2 was attributed to the electrodeposition of Cu and its impregnation within the corrosion product, which becomes less adherent. The free corrosion potential was found to be affected by the presence of the CuCl 2 , in a fashion compatible with the Wagner-Traud theory of mixed potential.

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Evolution of Hydrogen from Ferrous Hydroxide

Cited by 42 publications

References 1 publication

An experimental study on the preparation of tochilinite-originated intercalation compounds comprised of Fe1−xS host layers and various kinds of guest layers

An experimental study on the preparation of tochilinite-originated intercalation compounds comprised of Fe1−xS host layers and various kinds of guest layers

Analysis and TEM examination of corrosion scales grown on Alloy 690 exposed to pressurized water at 325 °C

Kinetics of high temperature corrosion of a low Cr‐Mo steel in aqueous NaCl Solution

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