The thermodynamic consideration for Fe-H2O system at 25°C

Misawa, Toshihei

doi:10.1016/s0010-938x(73)80037-x

Cited by 221 publications

(96 citation statements)

References 23 publications

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“…α-FeOOH seems to be the most stable modification of ferric oxide hydroxides. The solubility of α-FeOOH is approximately 10 5 times lower than that of γ-FeOOH [17]. In a study performed by Almeida et al [18] , involving one year of exposure in 19 unpolluted rural atmospheres in Ibero-America, X-Ray diffraction (XRD) analysis detected no crystalline phase at 4 sites (due to the low amount of corrosion products), only lepidocrocite at 6 sites, and both lepidocrocite and goethite at the remaining 9 sites.…”

Section: Dependence On Environmental Conditionsmentioning

confidence: 99%

Atmospheric corrosion of mild steel

Morcillo¹,

Fuente²,

Díaz³

et al. 2011

REVMETAL

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The atmospheric corrosion of mild steel is an extensive topic that has been studied by many authors in different regions throughout the world. This compilation paper incorporates relevant publications on the subject, in particular about the nature of atmospheric corrosion products, mechanisms of atmospheric corrosion and kinetics of the atmospheric corrosion process, paying special attention to two matters upon which relatively less information has been published: a) the morphology of steel corrosion products and corrosion product layers; and b) long-term atmospheric corrosion (>10 years). KeywordsAtmospheric corrosion; Mild steel; Long-term; Morphology; Review. corrosión atmosférica del acero suave resumenLa corrosión atmosférica del acero suave es un tema de gran amplitud que ha sido tratado por muchos autores en numerosas regiones del mundo. Este artículo de compilación incorpora publicaciones relevantes sobre esta temática, en particular sobre la naturaleza de los productos de corrosión atmosférica, mecanismos y cinética de los procesos de corrosión atmosférica, prestando una atención especial a dos aspectos sobre los que la información publicada ha sido menos abundante: a) morfología de los productos de corrosión del acero y capas de productos de corrosión, y b) corrosión atmosférica a larga duración (> 10 años).

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Section: Dependence On Environmental Conditionsmentioning

confidence: 99%

Atmospheric corrosion of mild steel

Morcillo¹,

Fuente²,

Díaz³

et al. 2011

REVMETAL

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“…At pHs < 2 iron is known to remain soluble [39]. This can be taken as an advantage in the leaching, as pH adjustment can significantly improve the selectivity between Cu and Fe.…”

Section: Leaching Of Ironmentioning

confidence: 99%

Hydrometallurgical Approach for Leaching of Metals from Copper Rich Side Stream Originating from Base Metal Production

Mohanty

Rintala

Halli

et al. 2018

Metals

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Pyrometallurgical metal production results in side streams, such as dusts and slags, which are carriers of metals, though commonly containing lower metal concentrations compared to the main process stream. In order to improve the circular economy of metals, selective leaching of copper from an intermediate raw material originating from primary base metal production plant was investigated. The raw material investigated was rich in Cu (12.5%), Ni (2.6%), Zn (1.6%), and Fe (23.6%) with the particle size D 80 of 124 µm. The main compounds present were nickel ferrite (NiFe 2 O 4 ), fayalite (Fe 2 SiO 4 ), cuprite (Cu 2 O), and metallic copper. Leaching was studied in 16 different solutions. The results revealed that copper phases could be dissolved with high yield (>90%) and selectivity towards nickel (Cu/Ni > 7) already at room temperature with the following solutions: 0.5 M HCl, 1.5 M HCl, 4 M NaOH, and 2 M HNO 3 . A concentration of 4 M NaOH provided a superior selectivity between Cu/Ni (340) and Cu/Zn (51). In addition, 1-2 M HNO 3 and 0.5 M HCl solutions were shown to result in high Pb dissolution (>98%). Consequently, 0.5 M HCl leaching is suggested to provide a low temperature, low chemical consumption method for selective copper removal from the investigated side stream, resulting in PLS (pregnant leach solution) which is a rich in Cu and lead free residue, also rich in Ni and Fe.

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“…1, 5,6) the CV and SSRT tests were carried out in buffer aqueous solutions of pH 10.0 at 298 K in which iron is immune to corrosion. Three kinds of buffer aqueous solutions were used in the present study, boric acid/borax (H 3 BO 3 /Na 2 B 4 O 7 ), sodium hydrogencarbonate/ sodium carbonate (NaHCO 3 /Na 2 CO 3 ) and disodium hydrogenphosphate/trisodium phosphate (Na 2 HPO 4 /Na 3 PO 4 ) buffer aqueous solutions.…”

Section: Materials and Test Solutionsmentioning

confidence: 99%

Effect of Applied Cathodic Potential on Susceptibility to Hydrogen Embrittlement in High Strength Low Alloy Steel

2003

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In order to investigate the effects of applied cathodic potential and chemical hydrogen absorption promoter (thiourea) on the susceptibility to hydrogen embrittlement of the high strength low alloy (HSLA) steel, slow strain rate tensile (SSRT) tests were conducted in various buffer aqueous solutions of pH 10.0. During SSRT tests, the specimens were cathodically polarized under potentiostatic control. Polarization levels were varied from the corrosion potential (E corr ) to hydrogen gas evolution potential (E H 2 gas ), including the adsorbed hydrogen potential (E Hads ) determined by cyclic voltammetry (CV). Additionally, thermal desorption spectroscopic (TDS) analyses were applied to the specimens fractured by SSRT test and the dependence of hydrogen absorption characteristic on applied potential was also examined for understanding the SSRT test results. Experimental results revealed that the hydrogen embrittlement behavior was strongly dependent on the applied cathodic potential. In the E Hads region, the susceptibility to hydrogen embrittlement increased with increasing cathodic overpotential. On the other hand, in the E H 2 gas region, the susceptibility was independent of the applied potential. Moreover, by adding thiourea to the solution, the susceptibility to hydrogen embrittlement increased slightly in the E H 2 gas region compared with that in the solution without thiourea. There was a relatively good correlation between the amount of hydrogen absorption per unit time (C H /t f ) and the time to failure (t f ), namely, the susceptibility to hydrogen embrittlement has a tendency to increase monotonically with increasing C H /t f . As a consequence, the potential dependence of hydrogen embrittlement was closely associated with the variation in hydrogen absorption rate under applied potential.KEY WORDS: hydrogen embrittlement; high strength low alloy steel; slow strain rate tensile test; cyclic voltammetry; thermal desorption spectroscopic analysis; potential dependence; hydrogen gas evolution; adsorbed hydrogen; hydrogen absorption.

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The thermodynamic consideration for Fe-H2O system at 25°C

Cited by 221 publications

References 23 publications

Atmospheric corrosion of mild steel

Atmospheric corrosion of mild steel

Hydrometallurgical Approach for Leaching of Metals from Copper Rich Side Stream Originating from Base Metal Production

Effect of Applied Cathodic Potential on Susceptibility to Hydrogen Embrittlement in High Strength Low Alloy Steel

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