Electrodissolution Kinetics of Iron in Chloride Solutions

Asakura, Shukuji; Nobe, Ken

doi:10.1149/1.2407943

Cited by 33 publications

(18 citation statements)

References 7 publications

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“…Similar complexes have also been proposed in other mechanisms (e.g., see Ref. (3,4,10,14,15). A good review of work indicating the importance of halo-iron complexes in iron corrosion is given by Foley (16,17).…”

Section: Cl--accelerated Mechanismsupporting

confidence: 53%

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Electrodissolution Kinetics of Iron in Chloride Solutions: VI . Concentrated Acidic Solutions

Kuo

Nobe

1978

J. Electrochem. Soc.

103

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Anodic iron dissolution in acidic chloride solutions (constant ionic strength of 4.5M) over a wide range of H + and C1-concentrations has been investigated. Anodic dissolution in low [H+]-concentrated chloride solutions is accelerated by both C1-and OH-with Tafel slopes of 0.075 V/decade at low polarization and accelerated by only OH-with Tafel slopes of 0.04 V/decade at high polarization. On the other hand, anodic dissolution in highly acidicconcentrated chloride solutions is accelerated by both H + and C1-with Tafel slopes of 0.11 V/decade and first-order dependence on both H + and C1-. For low C1-concentrations in either dilute or concentrated acidic solutions, anodic dissolution is inhibited by C1-. The experimental results indicate that anodic iron dissolution in acidic chloride solutions proceeds by simultaneous parallel reactions. Mechanisms which are consistent with the empirical rate expressions have been developed.

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Section: Cl--accelerated Mechanismsupporting

confidence: 53%

“…If fl : 0.5, the rate of anodic dissolution is ia,H --" ka,H [H + ] [C1-] exp ~ [15] Equation [15], which is derived from the proposed mechanism, is in accord with Eq. [10] which is a representation of the experimental results.…”

Section: Cl--accelerated Mechanismmentioning

confidence: 99%

Electrodissolution Kinetics of Iron in Chloride Solutions: VI . Concentrated Acidic Solutions

Kuo

Nobe

1978

J. Electrochem. Soc.

103

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“…with a = 89 Equations [43] yields ba ----60 mY, ZH+ = --1, and zx-------I (as ex---) 1), in accord with Eq.…”

Section: A(x-)a Wmentioning

confidence: 81%

Kinetics of Iron Corrosion in Concentrated Acidic Chloride Solutions

McCafferty

Hackerman

1972

J. Electrochem. Soc.

147

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The kinetics of active iron dissolution at 25°C has been studied in deaerated 1N and 6N chloride solutions for hydrogen ion concentrations of 0.1–6.0N. For 1N chloride solutions with false[H+false]≤3N , the dissolution reaction is described by anodic Tafel slope bnormala=60 normalmV and electrochemical reaction order with respect to hydrogen ion activity zH+=−1 . These parameters are characteristic of a dissolution mechanism in which chemisorbed halide ions interact with adsorbed hydroxyl ions in a two‐electron rate‐determining step. For 6N chloride solutions, this mechanism holds only over a narrower (H+) region up to 0.24N, in which zH+=−1 . With increased false[H+false],zH+ normalis zero ; and for false[H+false]2.4N,zH+=+2 , indicating that the hydrogen ion (and no longer the hydroxyl ion) catalyzed the dissolution reaction. A positive value of zH+ ensues for synergistic adsorption of hydrogen ions on the halide ion covered surface. A formal detailed dissolution mechanism is proposed, giving zH+=+2 and normalZx−>0 , in agreement with experiment. Alternate dissolution mechanisms including one‐electron transfer schemes are discussed.

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“…Previous studies [23][24][25][26] have given some attention to the influence of salinity on the corrosion behaviour of carbon-and low-alloy steels in differing aqueous solution chemistries (such as neutral, alkaline and CO2/H2S-containing solutions). However, few experimental investigations have been conducted to assess the effect of salinity in corrosive wear conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of salinity on the corrosive wear behaviour of engineering steels in aqueous solutions

Smith

Brownlie

Hodgkiess

et al. 2020

Wear

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The effect of salinity is assessed on the corrosive wear behaviour of a low-alloy steel (UNS G43400) and three stainless steels (UNS S15500, UNS S31600 and UNS S32760). Erosion-corrosion testing was conducted using a submerged impingement slurry jet test-rig. Three salinities were evaluated; 0.05%NaCl, 3.5%NaCl and 10%NaCl. Total volume losses (TVL) and a volumetric analysis technique were used to assess the damage in the directly-impinged zone (DIZ) and outer area (OA). Under all measured parameters, material loss for the stainless steels increased marginally with increased salinity. In terms of TVL and OA volume loss, the low alloy steel exhibited significantly greater material loss from 0.05%NaCl to 3.5%NaCl conditions, however, no further increase was evident when the salinity was raised to 10%NaCl.

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Electrodissolution Kinetics of Iron in Chloride Solutions

Cited by 33 publications

References 7 publications

Electrodissolution Kinetics of Iron in Chloride Solutions: VI . Concentrated Acidic Solutions

Electrodissolution Kinetics of Iron in Chloride Solutions: VI . Concentrated Acidic Solutions

Kinetics of Iron Corrosion in Concentrated Acidic Chloride Solutions

Effect of salinity on the corrosive wear behaviour of engineering steels in aqueous solutions

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