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potential-pH diagram

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Published: 01 January 2003
Fig. 13 Potential-pH diagram showing the domains of failure mode for 70Cu-30Ni brass in various solutions, together with the calculated positions of various boundaries relating to the domains of stability of different chemical species More
Image
Published: 01 January 2003
Fig. 14 Potential-pH diagram (Pourbaix) for iron in water at 25 °C (77 °F). A decrease in pH from 9 to 6 at potential of −0.2 V, which shifts iron from a region of stability to one of active corrosion, is indicated by the solid bar. More
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Published: 01 January 2003
Fig. 2 Potential-pH diagram of iron in water at 25 °C (77 °F) highlighting the corrosion processes in the hydronic pH range. SHE, standard hydrogen electrode More
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Published: 01 January 2005
Fig. 1 Pourbaix (potential-pH) diagram for the titanium-water system at 25 °C (75 °F). Source: Ref 9 More
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Published: 01 January 2006
Fig. 1 Pourbaix (potential-pH) diagram for the system iron-water at 25 °C (75 °F). Source: Ref 4 More
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Published: 30 September 2015
Fig. 3 Potential-pH diagram for the Cu-NH 3 -H 2 O system. Total NH 3 equals 1 mol/L. Source: Ref 3 More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003580
EISBN: 978-1-62708-182-5
...Abstract Abstract A potential pH diagram is a graphical representation of the relations, derived from the Nernst equation, between the pH and the equilibrium potentials (E) of the most probable electrochemical reactions occurring in a solution containing a specific element. This article...
Book Chapter

By Jerome Kruger
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003585
EISBN: 978-1-62708-182-5
...Abstract Abstract This article reviews the types of passivity and presents tactics that employ passivity to control corrosion. Thermodynamics provides a guide to the conditions under which passivation becomes possible. A valuable guide to thermodynamics is the potential-pH diagram...
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Published: 01 January 2005
Fig. 5 Potential-pH diagrams. (a) Zirconium in water at 25 °C (75 °F). (b) Theoretical conditions of corrosion, immunity, and passivation of zirconium at 25 °C (75 °F). (Kinetically, passivation may be extended to pH=−1.03.) More
Image
Published: 01 January 2003
Fig. 1 Potential-pH (Pourbaix) diagram for the system of magnesium and water at 25 °C (77 °F), showing the theoretical domains of corrosion, immunity, and passivation. Source: Ref 1 More
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Published: 01 January 2005
Fig. 1 Potential-pH equilibrium diagram for niobium-water at 25 °C (75 °F) More
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003715
EISBN: 978-1-62708-182-5
... reaction) must be consumed by an electrochemical reduction reaction (the cathodic reaction). Potential-pH ( E -pH) diagrams (Pourbaix diagrams), based on equilibrium thermodynamics for metal-water systems, show at a glance the regions of stability of the various phases that can exist in the system...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006522
EISBN: 978-1-62708-207-5
... it will impact corrosion resistance and surface treatment. It describes the thermodynamics of equilibrium oxidation processes and non-equilibrium corrosion processes. The article provides a discussion on aluminum oxidation under atmospheric and dynamic conditions. It presents the potential/pH (Pourbaix) diagram...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003577
EISBN: 978-1-62708-182-5
... Processes,” “Electrode Potentials,” and “Potential Measurements with Reference Electrodes.” With these basic notions defined, it is possible to explain the principle of potential-pH ( E -pH) diagrams in the article “Potential versus pH (Pourbaix) Diagrams.” These diagrams allow us to visualize...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006087
EISBN: 978-1-62708-175-7
... diagrams with the thermodynamics of oxygen reduction and hydrogen oxidation provide the necessary information to predict separation potential within a given system. Figure 3 , a potential-pH diagram for the copper-ammonia-water system, is discussed in detail in Ref 3 . Fig. 3 Potential-pH diagram...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003605
EISBN: 978-1-62708-182-5
... of biological organisms on these environmental variables is also an important consideration. Thermodynamics provides a theoretical framework within which the effects of several environmental variables might be pictured. In aqueous corrosion, the format often used is the potential-pH diagram, or Pourbaix...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003592
EISBN: 978-1-62708-182-5
... to this reference into values expressed with respect to other references. In particular, the conversion of the potentials from or to the hydrogen scale is frequently required for use of potential- pH diagrams, which are discussed in the article “Potential versus pH (Pourbaix) Diagrams” in this Section...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003633
EISBN: 978-1-62708-182-5
... and transgranular stress-corrosion cracking appear in a 10% NaOH solution at 288 °C (550 °F). (a) Alloy 600. (b) Alloy 800. (c) AISI type 304 stainless steel Application of Potential-pH Diagrams Critical potentials for SCC can also be related to potential-pH stability diagrams (Pourbaix diagrams) because...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004132
EISBN: 978-1-62708-184-9
... ppm Cl 350–550 660–1020 Uniform and other forms Ref 17 Alumina, SiC, Si 3 N 4 , zirconia, sapphire HCl plus H 2 O 2 465 870 Generally low resistance to degradation Ref 23 (a) Acids measurable as wt% Figure 4 presents the potential-pH (Pourbaix) diagram for iron...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004101
EISBN: 978-1-62708-184-9
... theoretically, but its practical use is limited. See the articles “Electrode Potentials” and “Potential versus pH (Pourbaix) Diagrams” in Volume 13A, ASM Handbook , 2003. One of the useful associated parameters from the Nernst equation is the standard electrode potential for classification purposes...