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hydrogen reduction

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230055
EISBN: 978-1-62708-298-3
... the challenges encountered with each. beryllium electrolytic reduction hydrogen reduction thermal decomposition thermodynamics THE FUNDAMENTAL understanding of beryllium reduction thermodynamics is essential to effectively read and interpret the following chapters on beryllium extraction, chemical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940087
EISBN: 978-1-62708-302-7
... of electrode reactions, η could be expressed in the form: (Eq 3.2) η = A + B log i where A and B are constants ( Ref 1 ). It is shown subsequently that simple electrode-kinetics theory leads to the following equations for the oxidation and reduction half-cell reactions, respectively: (Eq...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
... by reference to Fig. 4.16 . There, the corrosion potential is represented as the intersection of the anodic Tafel curve and the cathodic polarization curve for hydrogen-ion reduction at several pH values. It is pointed out that careful measurements have shown that the anodic Tafel line shifts with pH ( Ref 6...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310011
EISBN: 978-1-62708-286-0
... ) / Fe Standard half-cell reduction potentials versus the normal hydrogen electrode Table 1 Standard half-cell reduction potentials versus the normal hydrogen electrode Reaction Standard half-cell reduction potential vs. NHE (a) (V) Fe 3+ + e − = Fe 2+ 0.771 O 2 + 2H 2 O...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090067
EISBN: 978-1-62708-266-2
... for the iron-water system, the range of potentials and pH within which hydrogen can be released by reduction of water is defined. Below the sloping line marked “H” in Fig. 3.3 (the same line is unmarked in Fig. 3.4 ), it is possible for this cathodic reaction to occur: H 2 O → OH...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940127
EISBN: 978-1-62708-302-7
... and the oxygen reduced to water, the two processes occurring at different positions on the inert metal surface with electron transfer through the metal. If the metal is reactive, oxidation (corrosion) to convert metal to ions or reduction of ions in solution to the neutral metal introduces additional...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290009
EISBN: 978-1-62708-319-5
.... , Takajo S. , and Otsuka K. , Preparation of Ultrafine Metallic Particles by Hydrogen Reduction of Chloride Vapors , Solid State Phenom. , Vol 26 , 1992 , p 175 – 178 10.4028/www.scientific.net/SSP.25-26.175 • Jillavenkatesa A. , Dapkunas S.J. , and Lum L.S.H. , Practice...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030126
EISBN: 978-1-62708-282-2
... Oxide (?) Anhydrated ammonia Nitride CO/CO 2 /H 2 O Carbide CS 2 /H 2 O Carbide Titanium alloys Chloride Hydride Aluminum alloys, steels Various media Near-surface hydrogen The Phenomenon of SCC Overview of SCC Mechanisms Controlling Parameters Important Fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090001
EISBN: 978-1-62708-266-2
... hydrogen 1.1 The Phenomenon of Stress-Corrosion Cracking 1.2 Overview of Stress-Corrosion Cracking Mechanisms 1.3 Controlling Parameters 1.4 Important Fracture Features 1.5 Phenomenology of Crack Initiation Processes 1.6 Crack Initiation Mechanisms 1.7 Phenomenology of Crack...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
... in the circuit. For example, if the cathodic reaction is hydrogen reduction, the resulting hydrogen can have a deleterious effect. It can cause blistering of the metal or, if the metal is under stress, might cause cracking of the structure. The cathodic reaction can also create problems because of the resultant...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... ion. For the ferrous ion reduction to iron reaction expressed as: (Eq 2) E = − 0.440 − 0.059 2 log Fe Fe 2 + the standard electrode potential is −0.440 V with respect to the standard hydrogen electrode (SHE). At 25 °C (75 °F), the value for the constant 2.3 times...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030148
EISBN: 978-1-62708-282-2
..., transgranular, or quasi-cleavage cracking, and although the macroscopic features appear to be brittle, on a microscopic scale there is a high degree of local plasticity, suggesting that hydrogen enhances flow at the crack tip. Figure 15 shows the reduction in ductility associated with hydrogen charging a 72Ni...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000203
EISBN: 978-1-62708-312-6
... air delubrication, at 649 °C (1200 °F). Partial reduction of oxides took place during sintering, at 1205 °C (2200 °F) in 100% hydrogen for 30 minutes Fig. 26 Photomicrograph of as-polished cross-section of a high temperature-sintered 316L part, showing nearly complete reduction of oxides...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000059
EISBN: 978-1-62708-312-6
.... Figure 5.18 shows the profiles of a 316L part sintered at 1120 °C (2048 °F) in hydrogen with a dewpoint of –35 °C (–31 °F). A comparison with Fig. 3.10 , which shows the same profile for water-atomized 316L in the green condition, demonstrates the enormous degree of reduction of SiO 2 . Furthermore...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740001
EISBN: 978-1-62708-308-9
... for the production of steel from raw materials to finished mill products is shown in Fig. 1 . Steel production starts with the reduction of ore in a blast furnace into pig iron. Because pig iron is rather impure and contains carbon in the range of 3 to 4.5 wt%, it must be further refined in either a basic oxygen...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410439
EISBN: 978-1-62708-265-5
... shortness associated with copper and overheating and burning as occur during forging. It addresses various types of embrittlement, including quench embrittlement, tempered-martensite embrittlement, liquid-metal-induced embrittlement, and hydrogen embrittlement, and concludes with a discussion on high...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940271
EISBN: 978-1-62708-302-7
... in Fig. 5.6 . At pH values less than about 9, i crit is sufficiently large that corrosion generally occurs in the active potential range of the polarization curve. Below pH = 3 to 4, the surface remains free of corrosion products, and corrosion is largely due to hydrogen ion reduction. In strong mineral...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090317
EISBN: 978-1-62708-266-2
... alloys manifests itself as reductions in ductility during short-term tensile testing and as time-dependent formation and/or growth of cracks under longer-term conditions of sustained loading. These manifestations provide the basis for testing and characterizing stress-corrosion and hydrogen embrittlement...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820013
EISBN: 978-1-62708-339-3
... toughness. High dilution of baseplate (up to 35% for EGW, up to 50% for ESW). Minimal weld size. Usually fine-grained due to fast cooling. Weld structure is as cast. Effect on base metal Low heat inputs can cause rapid HAZ cooling. Flux coatings are a potential source of hydrogen. Generally a low...