Molten Salt Corrosion Resistance of Yttria Stabilized Zirconia Coating with Silicon Carbide Interlayer on High Density Graphite

Nickel superalloy Hastelloy-N, alloy X-750, stainless steel 316 (SS316), and stainless steel 304 (SS304) are among the alloys used in the construction of molten salt reactor (MSR). These alloys were analyzed for their corrosion resistance behavior in molten fluoride salt, a coolant used in MSR reactors with 46.5% LiF+ 11.5% NaF+ 42% KF. The corrosion tests were run at 700 °C for 100 h under the Ar cover gas. After corrosion, significant weight loss was observed in the alloy X750. Weight loss registered in SS316 and SS304 was also high. However, Hastelloy-N gained weight after exposure to molten salt corrosion. This could be attributed to electrochemical plating of corrosion products from other alloys on Hastelloy-N surface. SEM–energy-dispersive X-ray spectroscopy (EDXS) scans of cross-section of alloys revealed maximum corrosion damage to the depth of 250 µm in X750, in contrast to only 20 µm on Hastelloy-N. XPS wide survey scans revealed the presence of Fe, Cr, and Ni elements on the surface of all corroded alloys. In addition, Cr clusters were formed at the triple junctions of grains, as confirmed by SEM–EBSD (Electron Back Scattered Diffraction) analysis. The order of corrosion resistance in FLiNaK environment was X750 < SS316 < SS304 < Hastelloy-N.

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Improving the hot corrosion resistance of plasma sprayed ceria–yttria stabilized zirconia thermal barrier coatings by laser surface treatment

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2013.12.075 ◽

2014 ◽

Vol 57 ◽

pp. 336-341 ◽

Cited By ~ 43

Author(s):

Raheleh Ahmadi-Pidani ◽

Reza Shoja-Razavi ◽

Reza Mozafarinia ◽

Hossein Jamali

Keyword(s):

Corrosion Resistance ◽

Thermal Barrier Coatings ◽

Hot Corrosion ◽

Laser Surface ◽

Yttria Stabilized Zirconia ◽

Thermal Barrier ◽

Laser Surface Treatment ◽

Stabilized Zirconia ◽

Barrier Coatings ◽

Plasma Sprayed

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Elasto-plastic characteristics and mechanical properties of as-sprayed 8mol% yttria-stabilized zirconia coating under nano-scales measured by nanoindentation

Applied Surface Science ◽

10.1016/j.apsusc.2014.05.026 ◽

2014 ◽

Vol 309 ◽

pp. 271-277 ◽

Cited By ~ 9

Author(s):

J.M. Luo ◽

C.Y. Dai ◽

Y.G. Shen ◽

W.G. Mao

Keyword(s):

Mechanical Properties ◽

Yttria Stabilized Zirconia ◽

Zirconia Coating ◽

Stabilized Zirconia

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Study of Molten Salt Corrosion of Superni-75 using Termogravimetric Technique

Journal of Naval Architecture and Marine Engineering ◽

10.3329/jname.v3i2.922 ◽

1970 ◽

Vol 3 (2) ◽

pp. 77-82 ◽

Cited By ~ 5

Author(s):

TS Sidhu ◽

S Prakash ◽

RD Agrawal

Keyword(s):

Corrosion Resistance ◽

Molten Salt ◽

Hot Corrosion ◽

Corrosion Behaviour ◽

Thick Layer ◽

X Ray Diffraction ◽

Salt Corrosion ◽

Marine Engineering ◽

The Given ◽

Kinetics Of

The present study aims to evaluate the hot corrosion behaviour of the Ni-based alloy Superni- 75 in the molten salt environment of Na2SO-60%V2O5 at 900°C under cyclic conditions. The thermogravimetric technique was used to establish the kinetics of corrosion. X-ray diffraction, scanning electron microscopy/energy-dispersive analysis and electron probe microanalysis techniques were used to analyse the corrosion products. Superni-75 has successfully provided the hot corrosion resistance to the given molten salt environment. The hot corrosion resistance of the Superni-75 has been attributed to the formation of uniform, homogeneous and adherent thick layer of the scale consisting mainly of oxides of nickel and chromium, and refractory Ni(VO3)2. These oxides and refractory nickel vanadates have blocked the penetration of oxygen and other corrosive species to the substrate. Keywords: Hot corrosion, nickel-based alloy, superalloy, molten salt environment DOI: 10.3329/jname.v3i2.922 Journal of Naval Architecture and Marine Engineering 3(2006) 77-82

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