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active-passive metals

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.t65940183
EISBN: 978-1-62708-302-7
...Abstract Abstract This chapter discusses the complex polarization characteristics of active-passive metals and addresses related problems in interpreting their corrosion behavior. It begins by presenting several experimentally derived polarization curves for iron, comparing and contrasting them...
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Published: 01 January 2000
Fig. 25 Anodic polarization curves for an active metal and an active-passive metal More
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Published: 01 October 2011
Fig. 15.6 Corrosion characteristics of an active-passive metal as a function of solution oxidizing power (electrode potential) More
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Published: 01 January 2015
Fig. 14.3 Mixed-potential behavior of an active metal and a passive metal in an acid solution More
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Published: 01 January 2000
Fig. 22 Polarization behavior for a metal exhibiting active-passive anodic behavior. Source: ASTM Standard G 3 More
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Published: 01 January 2000
Fig. 27 Effect of increasing the rate of cathodic reaction on the corrosion behavior of an active-passive metal More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910049
EISBN: 978-1-62708-250-1
.... The relative position in the galvanic series varies greatly depending on whether the metal is in the active (corroding) or passive (protected) condition. Note in Table 6 the large shift in position for an 18-8 stainless steel (a widely used corrosion-resistant, austenitic 18-8 alloy) in the active condition...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910407
EISBN: 978-1-62708-250-1
..., and the prediction of the potential-pH diagram is that the metal will corrode. The concept of cathodic protection is to shift the potential from the active region to more reducing (negative) values in the immune region. Corrosion is thus prevented. An electrochemical polarization curve for an active/passive metal...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060369
EISBN: 978-1-62708-261-7
... positive, or noble, potential. To prepare a galvanic series, many environmental variables must be considered in measuring potentials: Some metals display two widely differing potentials (active-passive metals). Small changes in electrolyte can change the potentials significantly. Potentials may...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030180
EISBN: 978-1-62708-282-2
... , the metal is termed active-passive and can be anodically protected. Few systems exhibit this type of behavior. Some metals and solutions that have been found to have active-passive properties and can be anodically protected include: Metals Steels Stainless steels Nickel Nickel alloys...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030019
EISBN: 978-1-62708-282-2
..., such as aluminum and its alloys and the ferrous metals. Somewhat similar to the nickel alloys, they lie between the active and passive positions for stainless steels ( Table 1 ) and therefore induce localized corrosion of the active alloys. Nickel Alloys Nickel and its alloys are not readily polarized...
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Published: 01 January 2000
Fig. 26 Schematic polarization curve for a metal (e.g., stainless steel) that displays an active-passive transition. At relatively low potential values, within the active region, the behavior is linear, as it is for normal metals. With increasing potential, the current density suddenly decreases More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2000
DOI: 10.31399/asm.tb.fec.9781627083027
EISBN: 978-1-62708-302-7
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Published: 01 July 2000
Fig. 4.20 Galvanic series of various metals in flowing seawater at 2.4 to 4.0 m/s at 5 to 30 °C (volts vs. saturated calomel reference electrode). Note: Dark boxes indicate active behavior of active-passive alloys. Source: Ref 12 and 13 More
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Published: 01 December 2015
Fig. 2 Schematic anodic polarization curve. Metal-environment systems that have this type of anodic polarization behavior are termed active-passive and can be anodically protected. Source: Ref 23 More
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Published: 01 July 2000
Fig. 6.3 Schematic experimental polarization curves (solid curves) assuming active-passive behavior for the individual metal-oxidation curve and Tafel behavior for the individual cathodic-reactant reduction curve (dashed curves) More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910021
EISBN: 978-1-62708-250-1
.... This thin (~30Å) protective film, also referred to as a passive film, slows the reaction rate to very low levels. The corrosion resistance when dealing with passive behavior depends on the integrity of the protective film. If the passive film is broken or dissolves, then the metal can revert to active...
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Published: 01 July 2000
Fig. 6.4 Schematic experimental polarization curves (solid curves) assuming active-passive behavior for the individual metal-oxidation curve and Tafel behavior plus limiting diffusion for the individual dissolved-oxygen and hydrogen-ion reduction curves (dashed curves) More
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Published: 01 July 2000
Fig. 6.5 Schematic experimental polarization curves (solid curves) assuming active-passive behavior for the individual metal-oxidation curve and Tafel behavior plus limiting diffusion for the individual hydrogen-ion reduction curve in deaerated aqueous solution (dashed curves) More
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
... this film alone is responsible, in general, films thicken with increase in time usually to a steady value that is greater the higher the anodic potential. The steady-state thickness is observed to increase linearly with increase in potential, and for most active-passive metals, the maximum thickness...