Understanding the interaction of thiosulfate with Alloy 800 in aqueous chloride solutions using SECM

Xia, Da-Hai; Zhu, Renkang; Behnamian, Yashar; Luo, Jing‐Li; Lin, Changjian; Klimas, Stan J.

doi:10.1016/j.jelechem.2015.03.006

Cited by 33 publications

(33 citation statements)

References 47 publications

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“…However, after 4 hours in the air, the pitting potential is still lower than it was without contact with air, which is possibly a clue that the products of S 2 O 3 2¹ still affect the oxide film property. Similar work has been done by Hisaoka et al, who studied the stress corrosion cracking using alpha-brass in solutions of Na 2 S 2 O 3 and Na 2 S 2 O 3 + NH 3 and NaCl + NH 3 and found that the stress corrosion cracking life is short under the corrosion environment in repetition of the dipping and drying test. 49 …”

Section: Oxide Film Degradation Rate In Airsupporting

confidence: 69%

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Pitting Corrosion Mechanism of Alloy 800 in Simulated Crevice Chemistries Containing Thiosulfate

Gao

Xia

et al. 2016

Electrochemistry

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Interaction of thiosulfate with Alloy 800 was systematically investigated to obtain the kinetics in a neutral simulated steam generator crevice solution. Cyclic polarization showed that the pitting potential in a thiosulfate-chloride solution was much lower than in either a chloride solution or a sulphate-chloride solution, and thiosulfate selectively and distinguishably degraded the oxide film on Alloy 800. The donor density of oxide film formed in a thiosulfatechloride solution was slightly higher than in either a chloride-only solution or a sulphate-chloride solution. Even in the passivity range the material was degraded due to the slow interaction with S 2 O 3 2− with oxide, especially when the applied potential was close to the pitting potential. The UV-visible absorption spectra showed that thiosulfate formed a stable complex with Cu 2+ , and their product was soluble in aqueous solution, which is possible evidence to indicate that thiosulfate assists Cu 2+ in dissolving from an oxide film into solution. Also, due to the complexity of the reaction, thiosulfate decreased the oxidation potential of Cu 0 to Cu 2+ . Since the Cu, an impurity in Alloy 800, normally accumulates at the grain boundary, especially at the triple points, thiosulfate induced corrosion is in the form of pitting or intergranular attack.

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Section: Oxide Film Degradation Rate In Airsupporting

confidence: 69%

“…[1][2][3] Researches have showed that S 2 O 3 2¹ caused pitting, [4][5][6][7][8] intergranular attacks or intergranular corrosion [9][10][11] and stress corrosion cracking (SCC) 6,[12][13][14][15] on many kinds of materials. 16 It has been reported that the S 2 O 3 2¹ ion induced pitting and SCC of type 304 stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Pitting Corrosion Mechanism of Alloy 800 in Simulated Crevice Chemistries Containing Thiosulfate

Gao

Xia

et al. 2016

Electrochemistry

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“…30 The breakdown potential decreases first and then increases z E-mail: dahaixia@tju.edu.cn as CTCR decreases. 31,32 Generally, two situations regarding to the passivity degradation are summarized below:…”

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confidence: 99%

Factors Influencing Passivity Breakdown on UNS N08800 in Neutral Chloride and Thiosulfate Solutions

Wang

Shi

et al. 2017

J. Electrochem. Soc.

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In this work, the passivity degradation of UNS N08800 in solutions containing Cl − and S 2 O 3 2− is studied by using polarization curve, electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS). Experimental results reveal that the passivity breakdown heavily depends on anodic potentials, concentration ratios of Cl − to S 2 O 3 2− , and the composition of materials. A combined effect between Cl − and S 2 O 3 2− on pitting corrosion is observed at high anodic potentials at which the passive film is broken down; in this situation, S 2 O 3 2− ions can enter into the pits by electromigration, and they are reduced to S ads and S 2− , stabilizing the metastable pits and accelerate the pit growth rate. However, there is no such combined effect at low anodic potentials when the passive film is intact, on the contrary, S 2 O 3 2− is beneficial to passivity in chloride solutions. At low anodic potentials, the interaction of S 2 O 3 2− with an intact passive layer is weak, and the adsorption of S 2 O 3 2− would mitigate the detrimental effect of Cl − ions.

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“…In recent years, scanning electrochemical microscopy (SECM) has been developed for a wide range of applications in corrosion science. 12,13 An advantage of SECM is its capability to probe charge transfer occurring nonuniformly at interfaces. [14][15][16][17] Zhu et al investigated the impact of tensile and compressive stress on reactivity of the Alloy 800 C-ring sample using SECM and found that both tension and compression increased the localized surface reactivity, indicating corrosion susceptibility of Alloy 800 under stress in thiosulfate-contained chemistries.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-enhanced Surface Reactivity of X80 Pipeline Steel observed by Scanning Electrochemical Microscopy

Xia

Zhu

et al. 2016

Electrochemistry

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Effect of hydrogen on the surface reactivity of X80 pipeline steel was studied by scanning electrochemical microscopy (SECM), electrochemical impedance spectroscopy (EIS) and secondary ion mass spectroscopy (SIMS). Hydrogen can enhance the reactivity of passive film formed on X80 pipeline steel, reduce the corrosion resistance and thickness of this passive layer, which is due to an increase in hydroxide in the passive layer.

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Understanding the interaction of thiosulfate with Alloy 800 in aqueous chloride solutions using SECM

Cited by 33 publications

References 47 publications

Pitting Corrosion Mechanism of Alloy 800 in Simulated Crevice Chemistries Containing Thiosulfate

Pitting Corrosion Mechanism of Alloy 800 in Simulated Crevice Chemistries Containing Thiosulfate

Factors Influencing Passivity Breakdown on UNS N08800 in Neutral Chloride and Thiosulfate Solutions

Hydrogen-enhanced Surface Reactivity of X80 Pipeline Steel observed by Scanning Electrochemical Microscopy

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