High Temperature Corrosion of Inconel 600 in NaCl-KCl Molten Salts

Salinas-Solano, G.; Porcayo-Calderón, J.; Salinas-Bravo, V. M.; Ascencio-Gutiérrez, J. A.; Martínez-Gómez, L.

doi:10.1155/2014/696081

Cited by 29 publications

(12 citation statements)

References 24 publications

(29 reference statements)

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“…Similar depletion processes have been reported in studies of corrosion by molten salts [81][82][83][84][85]. Figure 11 shows the surface morphology of the oxides formed at 900°C.…”

Section: Sem Analysissupporting

confidence: 79%

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Ramos-Hernández

Porcayo-Calderón

Mayén³

et al. 2018

Advances in Materials Science and Engineering

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is paper discusses the effect of the addition of noble metals on the microstructure, mechanism, and oxidation kinetics of the Ni 3 Al intermetallic alloy. Ni 3 Al was doped with 1% (atomic percent) of Au, Ag, Pd, and Pt. Oxidation behavior of the alloys was evaluated at 900, 1000, and 1100°C in O 2 for 24 hours. XRD analysis showed that the addition of noble metals favored the oxide growth on preferential crystallographic planes. In addition, the preferential substitution of the noble metals in the Ni 3 Al structure modifies the surface composition by increasing the Al/Ni ratio. It was observed that most of the alloys showed a subparabolic behavior, and only the intermetallic base and the alloy doped with Ag show a parabolic behavior at 900°C. e developed oxides were analyzed both superficially and in cross section by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA). It was evident that only the intermetallic base showed the formation of a duplex oxide scale (Al 2 O 3 /NiO). e alloys doped with noble metals showed the oxide growth practically of pure Al 2 O 3 . is was due to a decrease in the diffusion of the Ni cations because of the presence of the noble metals in the crystalline structure.

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“…Similar depletion processes have been reported in studies of corrosion by molten salts [81][82][83][84][85]. Figure 11 shows the surface morphology of the oxides formed at 900°C.…”

Section: Sem Analysissupporting

confidence: 79%

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Ramos-Hernández

Porcayo-Calderón

Mayén³

et al. 2018

Advances in Materials Science and Engineering

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“…Considering molten nitrate salts with different chloride impurity levels, it is proposed that the above‐discussed active corrosion process can affect the corrosion process. However, unlike corrosion in molten chloride salts where chlorine is the major corrosive agent, the chloride content in the investigated nitrate mixture is at a much lower chloride level. This level of chloride may be not sufficient for a continuous active corrosion process.…”

Section: Discussionmentioning

confidence: 87%

“…The influence of chlorides on hot corrosion has been discussed elsewhere for NaCl containing sulfates and chloride salt mixtures . It is known that metal chlorides form at regions where the oxygen partial pressure is very low, i.e., the metal–oxide interface.…”

Section: Discussionmentioning

confidence: 99%

“…When chlorides form, they diffuse towards the surface of the oxide where higher oxygen partial pressure is available, resulting in oxidation of the chloride via Eqs. – which are parts of an “active corrosion” process

3 F e C {normall}_{2} + 2 {normalO}_{2} \leftrightarrow F {normale}_{3} {normalO}_{4} + 3 C {normall}_{2}

2 F e C {normall}_{2} + 3 ∖ 2 {normalO}_{2} \leftrightarrow F {normale}_{2} {normalO}_{3} + 2 C {normall}_{2}

2 C r C {normall}_{3} + 3 ∖ 2 {normalO}_{2} \leftrightarrow C {normalr}_{2} {normalO}_{3} + 3 C {normall}_{2}

2 C r C {normall}_{2} + 3 ∖ 2 {normalO}_{2} \leftrightarrow C {normalr}_{2} {normalO}_{3} + {2 C l}_{2}

…”

Section: Discussionmentioning

confidence: 99%

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High temperature corrosion in molten solar salt: The role of chloride impurities

Dorcheh

Durham

Galetz

2017

Materials & Corrosion

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The role of chloride impurities in molten NaNO3‐KNO3 (solar salt) mixture on corrosion behavior of low‐chromium ferritic‐martensitic X20CrMoV11‐1 steel (X20) and stainless steel 316 (SS316) was studied at 600 °C. Gravimetric and metallographic methods were employed to characterize the kinetics of oxidation and the resulting corrosion products. Steel X20 showed non‐protective character in both low‐ (up to 0.02 wt% Cl−) and high‐ (up to 0.25 wt% Cl−) chloride salts by forming a thick and non‐compact oxide scale. A significant increase in weight gain was observed when X20 steel was immersed in the high‐chloride‐containing salt. Furthermore, the scale underwent severe deformation. SS316 showed superior corrosion resistance in both low‐ and high‐chloride salts. Oxide scales formed on both steels included two zones: an outer Na‐rich oxide and an inner mixed oxide based on Fe2O3 and Fe3O4 structures. The morphology and composition of these zones were significantly different on X20 and SS316 steels. A passive Cr‐rich oxide layer at the metal/oxide interface was characterized as a protective layer. In the case of stainless steel 316 this layer showed even higher continuity when tested in the high‐chloride salt resulting in better protection during the isothermal test.

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“…An elements line-scan through the interface (Figure 9a,b) allows the defining of the above; in addition, there is a region near 10 microns enriched in Ni and with a depletion in both Cr and Fe in the surface of the steel. This phenomenon is common in active corrosion processes when the material is unable to develop a stable protective oxide due to its continuous dissolution by the action of the molten salts [18,19].…”

Section: Resultsmentioning

confidence: 99%

Rare Earth-Based Compounds as Inhibitors of Hot-Corrosion Induced by Vanadium Salts

et al. 2019

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In this study, the performance evaluation of lanthanum compounds as corrosion inhibitors of vanadium salts was performed. The inhibitors tested were lanthanum acetate and La2O3. The performance of the inhibitors was tested using sodium metavanadate (NaVO3) as a corrosive medium at 700, 800, and 900 °C. The corrosion inhibitory effect was evaluated on the corrosion process of 304H stainless steel. The corrosion rate of the steel was determined by the mass loss technique after 100 h of immersion in the corrosive salt with and without the addition of the corrosion inhibitor. The results show that lanthanum compounds act as corrosion inhibitors of vanadium salts. The inhibitory effect increases by increasing the concentration and tends to decrease when increasing the test temperature. Lanthanum compounds act as excellent corrosion inhibitors due to their ability to stabilize vanadium cations. Vanadium is stabilized by forming a new compound, lanthanum vanadate (LaVO4), with a melting point much higher than the compounds formed when Mg or Ni compounds are used as corrosion inhibitors.

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High Temperature Corrosion of Inconel 600 in NaCl-KCl Molten Salts

Cited by 29 publications

References 24 publications

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

High temperature corrosion in molten solar salt: The role of chloride impurities

Rare Earth-Based Compounds as Inhibitors of Hot-Corrosion Induced by Vanadium Salts

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High Temperature Corrosion of Inconel 600 in NaCl-KCl Molten Salts

Cited by 29 publications

References 24 publications

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni3Al

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni3Al

High temperature corrosion in molten solar salt: The role of chloride impurities

Rare Earth-Based Compounds as Inhibitors of Hot-Corrosion Induced by Vanadium Salts

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Product

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Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al