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standard hydrogen electrode

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940023
EISBN: 978-1-62708-302-7
... Table 2.3 Potentials of some reference electrodes or half cells H 2 /H + Reaction: H 2 = 2H + + 2e (Standard Hydrogen Electrode, SHE) H 2 /H + , pH = 0, P H 2 = 1.0 atm 0 mV (SHE) Ag/AgCl Reaction: Ag = Ag + + e or Ag + Cl – = AgCl + e Ag/AgCl, saturated KCl +196 mV...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910427
EISBN: 978-1-62708-250-1
... by maintaining a metal surface in contact with an environment of controlled chemical composition. By fixing the concentration of species in the environment, the potential of the metal surface is fixed. Standard reference electrodes that are identified in Table 9 include a standard hydrogen electrode...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940001
EISBN: 978-1-62708-302-7
... represented in Fig. 1.5 . In practice, individual interface differences in potential, Δ ϕ, are assigned values relative to the standard hydrogen electrode as discussed in the next chapter. In this text, these values are designated by E for the general case, by E′ for the case of no current passing, and by E...
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
... with respect to a reference electrode . Reference electrodes are constructed such that they have a stable potential; this is discussed further in Chapter 3 . A common reference electrode in aqueous solutions is the normal hydrogen electrode (NHE), also known as the standard hydrogen electrode (SHE...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940087
EISBN: 978-1-62708-302-7
... . In the experimental measurement of overpotential, the external-circuit current, I ex , and the potential of the metal (frequently called the working electrode) relative to a reference electrode are measured ( Fig. 3.7 ). For experimental convenience, the reference electrode is most often not the standard hydrogen...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940233
EISBN: 978-1-62708-302-7
..., i corr is evaluated with the polarization-resistance (or Stern-Geary) equation, Eq 6.28 . The two-electrode method is a relatively simple and fast method for evaluating R p when compared with the standard polarization-resistance and electrochemical-impedance methods. After i corr...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
... stainless steel (active) Ni-Resist (high-nickel cast iron) Chromium stainless steel, 13% Cr (active) Cast iron Steel or iron Aluminum alloy 2024 Cadmium Aluminum alloy 1100 Zinc Magnesium and magnesium alloys Active or anodic end of series Additional standard electrode...
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 ϕ H 2 and ϕ′ H + have similar meanings relative to the standard hydrogen electrode (SHE). In Chapter 3 (in the section “Charge-Transfer Polarization” ), the definition was written in general terms to encompass nonequilibrium conditions: (Eq 4.3) E M = ( ϕ M o...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090241
EISBN: 978-1-62708-266-2
... are for the standard hydrogen electrode (SHE) scale. Source: Ref 8.3 Fig. 8.2 Weight loss of alloy 3004-H14 exposed 1 week in distilled water and in solutions of various pH values. Specimens were 1.6 × 13 × 75 mm (0.06 × 0.5 × 3 in.). The pH values of solutions were adjusted with HCl and NaOH. Test...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910021
EISBN: 978-1-62708-250-1
... corrosivity for particular metals. Solutions can be described as acidic, neutral, or alkaline based on the relative ratio of hydrogen ions to hydroxyl ions. Figure 14 shows this relationship. Where hydrogen ions and hydroxyl ions are in balance, the solution is neutral. Where hydrogen ions predominate over...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
... as follows: 2 H + e − → H 2 Each reaction is referred to as a half-cell reaction. The standard potential for a half-cell is given with reference to a standard hydrogen electrode (H 2 /H + ) taken as zero potential. The standard conditions are a one molar (1 M ) aqueous...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.9781627082501
EISBN: 978-1-62708-250-1
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240323
EISBN: 978-1-62708-251-8
... and immersed in an electrolyte. The electrode potential, measured in volts, provides an electrical measure of a metal to give up electrons. Electrode potentials are measured with two half-cells: one for the corroding metal and the other for a standard hydrogen half-cell consisting of gaseous hydrogen (H...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480331
EISBN: 978-1-62708-318-8
... activity is 10. All other ionic activities are 10 5 . emf, electromotive force; SHE, standard hydrogen electrode Fig. 14.14 Effect of tantalum on the corrosion resistance of titanium-tantalum alloys in boiling acid solutions Fig. 14.13 General corrosion profiles of aged titanium alloys...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030005
EISBN: 978-1-62708-282-2
... tendency for corrosion) Note: The excess of free energy is related to the standard electrode (metal) potential value. (Complete metal electrode potential values can be found in Tables of Standard Electrode Potentials , G. Milazzo and S. Caroli, Ed., Wiley-Interscience, 1977.) NHE, normal hydrogen...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870025
EISBN: 978-1-62708-299-0
... Na + + e – → Na −2.71 Ca 2+ + 2 e – → Ca −2.87 K + + e – → K −2.93 Li + + e – → Li −3.05 SHE, standard hydrogen electrode As shown in Fig. 1 , the oxide film that develops in normal atmospheres is composed of two layers ( Ref 1 ). The inner oxide layer next...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290099
EISBN: 978-1-62708-306-5
... steels Low carbon: 0.1–0.25% C Easily welded No preheat or postheat required Medium carbon: 0.25–0.50% C Use low-hydrogen electrodes Preheat (300–500 °F) Temper High carbon: 0.5–1.0% C Use low-hydrogen electrodes Preheat (400–600 °F) Temper Low-alloy steels Q&T: 0.22% C max...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820143
EISBN: 978-1-62708-339-3
... from weld cracking); S, strength of welded joint in as-welded condition (rating applies specifically to fillet welds, but all rods and electrodes rated will develop presently specific minimum strengths for butt welds); D, ductility (rating based on free bend elongation of the weld); C, corrosion...