High temperature corrosion of coatings and boiler steels below chlorine-containing salt deposits

Uusitalo, Mikko A.; Vuoristo, Petri; Mäntylä, T.

doi:10.1016/j.corsci.2003.09.026

Cited by 228 publications

(124 citation statements)

References 18 publications

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“…The influence of alkali chlorides and other chlorine-containing species on the high temperature corrosion of different metals/alloys has been investigated by several researchers [13,14,[25][26][27][28][29]. The strong acceleration of corrosion by HCl, KCl and NaCl has been attributed to alloy chlorination, e.g.…”

Section: Discussionmentioning

confidence: 99%

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

et al. 2015

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The KCl-induced corrosion of the FeCrAl alloy Kanthal Ò APMT in an O 2 ? N 2 ? H 2 O environment was studied at 600°C. The samples were pre-oxidized prior to exposure in order to investigate the protective nature of alumina scales in the present environment. The microstructure and composition of the corroded surface was investigated in detail. Corrosion started at flaws in the pre-formed a-alumina scales, i.e. a-alumina was protective in itself. Consequently, KCl-induced corrosion started locally and, subsequently, spread laterally. An electrochemical mechanism is proposed here by which a transition metal chloride forms in the alloy and K 2 CrO 4 forms at the scale/gas interface. Scale de-cohesion is attributed to the formation of a sub-scale transition metal chloride.

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Section: Discussionmentioning

confidence: 99%

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

et al. 2015

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“…The coupons are exposed at temperatures below 500°C, and therefore it is likely the corrosion will be parabolic 15 . A high %O 2 indicates oxidising conditions, under which protective oxide scales are more likely to form 14 . Samples analysed in the scope of this paper do not show the full oxidation of the metal coupons as only the loose debris removed from the probes was analysed.…”

Section: (B) Sample Atmospheresmentioning

confidence: 99%

“…EDS analyses of these octahedral crystals show that they contain a large amount of Fe and O, alongside minor portions of K, Cl and Ni, confirming the presence of magnetite. The K and Cl, likely to be present as KCl, is thought to have induced FeCl 2 transport to the surface of the deposit where upon encountering the O 2 will have formed the octahedral magnetite crystals, through an active oxidation mechanism 14 . …”

Section: Magnetitementioning

confidence: 99%

“…Under reducing conditions an oxide barrier which is defective and far less protective than an oxide layer formed under conditions of high O 2 is likely due to little O 2 present to react and form a protective layer 14 . A presence of CO at concentrations higher than 2% has previously been shown to increase the corrosive rate of HCl by 2.5 times 15 .…”

Section: Introductionmentioning

confidence: 99%

“…A presence of CO at concentrations higher than 2% has previously been shown to increase the corrosive rate of HCl by 2.5 times 15 . A high %O 2 indicates oxidising conditions, under which protective oxide scales are more likely to form 14 . In the high p(O 2 ) metal chlorides diffuse to the scale surface and upon encountering a higher p(O 2 ) gradient solid metal oxides are formed in a loosely adherent non-protective, porous layer 15 .…”

Section: Introductionmentioning

confidence: 99%

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Ag Nanoparticle‐Induced Surface Chloride Immobilization Strategy Enables Stable Seawater Electrolysis

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Although hydrogen gas (H2) storage might enable offshore renewable energy to be stored at scale, the commercialization of technology for H2 generation by seawater electrolysis depends upon the development of methods that avoid the severe corrosion of anodes by chloride (Cl−) ions. Here, we reveal that the stability of an anode used for seawater splitting can be increased by more than an order of magnitude by loading Ag nanoparticles on the catalyst surface. In experiments, an optimized NiFe‐layered double hydroxide (LDH)@Ag electrode displayed stable operation at 400 mA cm−2 in alkaline saline electrolyte and seawater for over 5000 and 2500 h, respectively. The impressive long‐term durability was more than 20 times that of an unmodified NiFe‐LDH anode. Meticulous characterization and simulation revealed that in the presence of an applied electric field, free Cl− ions reacted with oxidized Ag nanoparticles to form stable AgCl species, giving rise to the formation of a Cl−‐free layer near the anode surface. Because of its simplicity and effectiveness, we anticipate that the proposed strategy to immobilize chloride ions on the surface of an anode has the potential to become a crucial technology to control corrosion during large‐scale electrolysis of seawater to produce hydrogen.This article is protected by copyright. All rights reserved

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High temperature corrosion of coatings and boiler steels below chlorine-containing salt deposits

Cited by 228 publications

References 18 publications

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Analysis of deposits formed during biomass co-firing on 15Mo3 under different gas and temperature conditions

Ag Nanoparticle‐Induced Surface Chloride Immobilization Strategy Enables Stable Seawater Electrolysis

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