Crevice Corrosion Stabilization and Repassivation Behavior of Alloy 625 and Alloy 22

Kehler, B. A.; Ilevbare, G. O.; Scully, John R.

doi:10.5006/1.3281677

Cited by 133 publications

(127 citation statements)

References 3 publications

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“…7 and 10, one can conclude that the repassivation potential is independent of the pH of the bulk solution. Similar observations were made by Sridhar and Cragnolino [15] and Kehler et al [34]. The (i·x) saltfilm value of 17-4PH changed by only 0.1 A m −1 for such a large change in pH value of the bulk electrolyte, thus proving that the pit stability product was also nearly independent of the pH of the bulk electrolyte.…”

Section: +supporting

confidence: 73%

“…After reaching the plateau value, the repassivation potential becomes invariant of pit depth. Similar reports [16,34,41,42] on different materials showed a similar lack of sensitivity of repassivation potential to pit depth when large amounts of charge were passed to grow the pits and hence defining the lower bound in potential which can sustain pit growth. As shown in Fig.…”

Section: E Rp and (I ⋅ X) Saltf Ilmsupporting

confidence: 57%

“…Work by different authors has focused on the dependence of E rp and (i ⋅ x) on different factors such metallurgical composition [23][24][25][26][27][28][29][30], temperature [13,[31][32][33][34], bulk electrolyte composition [13,29,[32][33][34][35][36][37][38], and pH [33,34]. In the present work, a systematic study of the dependence of the pit stability product under a salt film and repassivation potential of four stainless steels (304, 316L, 17-4PH, and Custom 465) on bulk chloride concentration and pH using the artificial pit technique is described [20,22].…”

Section: Introductionmentioning

confidence: 99%

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Effects of environmental factors on key kinetic parameters relevant to pitting corrosion

Woldemedhin

Srinivasan

Kelly

2015

J Solid State Electrochem

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Experiments using stainless steel artificial pit (leadin-pencil) electrodes in ferric chloride and lithium chloride solutions were performed in order to determine the effects of key environmental factors such as chloride concentration and pH of the bulk solution on the central parameters utilized to characterize the pitting phenomenon-the repassivation potential E rp and the pit stability product under a salt film (i· x) saltfilm . For all the stainless steel alloys studied, a relative independence of the E rp to the pit depth was observed once sufficient anodic charge had been passed. The pit stability product under a salt film was seen to be largely insensitive to the pH of the bulk solution. E rp , on the other hand, was fairly independent of bulk pH only at the lower chloride concentrations of both lithium chloride and ferric chloride solutions. The two parameters were affected differently by variation in the chloride concentration of the bulk solutions. Increasing the chloride concentration resulted in a decrease in the value of (i·x) saltfilm for all alloys in both solutions. In ferric chloride, the value of E rp increased with increasing chloride concentration for Custom 465 and the austenitic steels, whereas it decreased across the same range for 17-4 pH. These trends were explained qualitatively using solution conductivity and alloying composition arguments. Finally, the results obtained from this study allowed for a rationalization of the phenomenology, enabling a method of measurement of the diffusion coefficient and the concentration at saturation of the Bstainless steel cation^within the pit, both of which agreed well with values obtained from the existing literature.

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Section: +supporting

confidence: 73%

Section: E Rp and (I ⋅ X) Saltf Ilmsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of environmental factors on key kinetic parameters relevant to pitting corrosion

Woldemedhin

Srinivasan

Kelly

2015

J Solid State Electrochem

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“…This is important in view of the fact that most industrially important systems are multicomponent. Several studies have shown that various inorganic anions such as nitrate, sulfate or carbonate can inhibit localized corrosion of Fe-Ni-Cr-Mo alloys (Szklarska-Smialowska, 1986, Strehblow and Titze, 1977, Jallerat et al, 1984, McCafferty, 1990, Kehler et al, 2001, Dunn et al, 2005a,b, Yang and Macdonald, 2007. In general, the effectiveness of the inhibition is a complex function of the concentrations of both aggressive and inhibitive ions, temperature, and the chemical nature of the anion.…”

Section: Development Of a Model For The Repassivation Potentialmentioning

confidence: 99%

Prediction of Corrosion of Advanced Materials and Fabricated Components

Anderko¹,

Engelhardt²,

Łencka³

et al. 2007

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“…4 By their nature, metals are often susceptible to corrosion, although extremely corrosion resistant alloys (CRAs) have been developed by the judicious combination of alloying elements and prescribed processing. These alloys, such as the Ni-based Alloy 22 that was planned as the canister material for Yucca Mountain, [5][6][7] are protected by the spontaneous formation of a very thin surface oxide layer known as a passive film. However, such nanometer-thick films can break down and lead to accelerated forms of corrosion.…”

mentioning

confidence: 99%