| 1. |
- Ajay, A., et al.
(author)
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Hot corrosion behavior of solution precursor and atmospheric plasma sprayed thermal barrier coatings
- 2015
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In: Corrosion Science. - : Elsevier Ltd. - 0010-938X .- 1879-0496. ; 98, s. 271-279
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Journal article (peer-reviewed)abstract
- Hot corrosion behavior of solution precursor plasma spray (SPPS) thermal barrier coating (TBC) in molten salt mixtures of 90wt.% Na2SO4+5wt.% V2O5+5wt.% NaCl and 50wt.% Na2SO4+50wt.% V2O5 at 900°C is compared vis-à-vis atmospheric plasma spray (APS) coating. APS TBCs show better hot corrosion resistance than SPPS TBCs in both the salt mixtures. The vertical cracks in SPPS coatings, meant for strain tolerance and high thermal cycling life, serve as channels for transporting salts across the coating to bond coat/top coat interface and accelerate failure. © 2015 Elsevier Ltd.
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| 2. |
- Ali-Löytty, Harri, et al.
(author)
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The role of (FeCrSi)2(MoNb)-type Laves phase on the formation of Mn-rich protective oxide scale on ferritic stainless steel
- 2018
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In: Corrosion Science. - : Elsevier BV. - 0010-938X. ; 132, s. 214-222
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Journal article (peer-reviewed)abstract
- Microalloying of stainless steel with reactive elements increases oxidation resistance but makes the alloy prone to microstructural changes. XPS results reveal changes in the initial oxidation mechanism on Ti-Nb stabilized ferritic stainless steel (EN 1.4521) after 120 h heat treatment at 650 °C. Age-precipitation of (FeCrSi)2(MoNb)-type Laves phase resulted in less pronounced surface segregation and oxidation of microalloying elements. Si oxidizes preferentially at the Laves precipitate locations via outward diffusion forming diffusion barrier for the other scale forming elements. Most significantly the diffusion of Mn and the formation of low volatile (Mn,Cr)3O4 spinel oxide at the surface was strongly suppressed.
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| 3. |
- Alnegren, Patrik, 1988, et al.
(author)
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Degradation of ferritic stainless steels under conditions used for solid oxide fuel cells and electrolyzers at varying oxygen pressures
- 2016
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In: Corrosion Science. - : Elsevier BV. - 0010-938X. ; 110, s. 200-212
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Journal article (peer-reviewed)abstract
- Four commercial ferritic stainless steels were tested at 850 °C in oxygen pressures ranging from 10-4 to 1 atm, in order to investigate the isolated effect of oxygen pressure on corrosion, in the context of solid oxide electrolysis cells. The oxidation rates of all steels were essentially independent of oxygen partial pressure, which indicates n-type behavior. FIB/SEM analysis revealed that the grain size of the oxides was found to decrease at lower oxygen pressures. Volatile Cr species evaporation in pure oxygen was significantly lower than what has been reported for simulated solid oxide fuel cell environments with humid air.
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| 4. |
- Anantha, Krishnan Hariramabadran, et al.
(author)
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Experimental and modelling study of the effect of tempering on the susceptibility to environment-assisted cracking of AISI 420 martensitic stainless steel
- 2019
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In: Corrosion Science. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0010-938X .- 1879-0496. ; 148, s. 83-93
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Journal article (peer-reviewed)abstract
- The resistance to environment-assisted cracking (EAC) of AISI 420 martensitic stainless steel (MSS) was investigated in 0.3 M NaCl solution (room temperature) at constant loads for 30 days. The steel tempered at 250 degrees C was superior to the 500 degrees C-temper, which showed corrosion pits favouring cracking. The fracture surface showed faceted grains, cleavage, striations, and inter- and transgranular cracks, suggesting a mixed stress corrosion cracking (SCC) and hydrogen embrittlement (HE) mechanism as the cause for EAC. Finite element modelling (FEM) indicated strain/stress localization at the mouth of deep pits and at the wall of shallow pits, displaying the favoured locations for pit-to-crack transition.
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| 5. |
- Asala, Gbenga, et al.
(author)
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Hot corrosion behaviour of wire-arc additive manufactured Ni-based superalloy ATI 718Plus®
- 2019
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In: Corrosion Science. - : Elsevier BV. - 0010-938X .- 1879-0496. ; 158
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Journal article (peer-reviewed)abstract
- The hot corrosion behaviour of wire-arc additive manufactured and wrought ATI 718Plus® are studied. ATI 718Plus® produced by the additive manufacturing process, in the as-processed condition, exhibits a significantly lower hot corrosion resistance in comparison to the wrought alloy. Analytical electron microscopy and spectroscopy techniques, with corroboration by thermodynamic calculations, are used to identify the underlying cause of the poor hot corrosion resistance. Based on the understanding accrued from the analyses, post-processing heat treatments are used to improve the hot corrosion resistance, which is valuably pertinent to the application of ATI 718Plus® produced by additive manufacturing in hot corrosive environments. © 2019 Elsevier Ltd
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| 6. |
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| 7. |
- Bolivar, J., et al.
(author)
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Evaluation of multiple stress corrosion crack interactions by in-situ Digital Image Correlation
- 2017
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In: Corrosion Science. - : Elsevier Ltd. - 0010-938X .- 1879-0496. ; 128, s. 120-129
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Journal article (peer-reviewed)abstract
- Digital Image Correlation (DIC), Acoustic Emission and Electrochemical Noise measurements were applied to study the growth of multiple intergranular cracks as a colony on an Alloy 600 in a tetrathionate solution. Cracks exceeding 55 μm in length and 0.45 μm in opening were successfully detected by DIC. Moreover, crack population was classified into initiating, active and dormant cracks, active population being the larger one. The emergence and intensification of interactions produced a modification on the colony growth behavior. They range from a mostly surface crack propagation (in the absence of interactions), to in depth propagation predominantly governed by crack shielding
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| 8. |
- Calmunger, Mattias, et al.
(author)
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Surface Phase Transformation in Austenitic Stainless Steel Induced by Cyclic Oxidation in Humidified Air
- 2015
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In: Corrosion Science. - : Pergamon Press. - 0010-938X .- 1879-0496. ; 100, s. 524-534
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Journal article (peer-reviewed)abstract
- The formation of α’ martensite at the surface of an AISI 304 stainless steel subjected to cyclic heating in humidified air is reported. The α’ martensite formed during the cooling part of the cyclic tests due to local depletion of Cr and Mn and transformed back to austenite when the temperature again rose to 650 °C. The size of the α’ martensite region increased with increasing number of cycles. Thermodynamical simulations were used as basis for discussing the formation of α’ martensite. The effect of the α’ martensite on corrosion is also discussed.
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| 9. |
- Chang, Tingru, et al.
(author)
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The golden alloy Cu-5Zn-5Al-1Sn : A multi-analytical surface characterization
- 2018
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In: Corrosion Science. - : Elsevier. - 0010-938X .- 1879-0496. ; 131, s. 94-103
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Journal article (peer-reviewed)abstract
- The golden alloy Cu-5Zn-5Al-1Sn has found many applications because of its appearance and resistance to tarnishing. The microstructure and multi-component surface oxide of Cu-5Zn-5Al-1Sn have been investigated through a multi-analytical approach. Compared to commercial Cu metal, Cu-5Zn-5Al-1Sn has significantly smaller grains and higher fraction of coherent twin boundaries. The 5-10 nm thick oxide formed after diamond polishing has four identified sub-oxides all contributing to the overall corrosion resistance. Cu2O is mainly located in the outer part, followed by ZnO, SnO2 and Al2O3 closer to the alloy substrate. The latter three possess barrier properties, while Cu2O exhibits a more complex structure.
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| 10. |
- Chang, Tingru, et al.
(author)
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The golden alloy Cu5Zn5Al1Sn : Patina evolution in chloride-containing atmospheres
- 2018
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In: Corrosion Science. - : Elsevier. - 0010-938X .- 1879-0496. ; 133, s. 190-203
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Journal article (peer-reviewed)abstract
- The influence of chloride deposition on the formation, evolution and barrier properties of the patina formed on CuSZn5Al1Sn used for architectural cladding is explored via long-term marine field exposures and laboratory investigations. The presence of Cu2O, ZnO, Al2O3 and SnO2 within the inner part of the patina and intercalation of SnO2, Zn-5(CO3)(2)(OH)(6), Zn6Al2(OH)(16)CO3 center dot 4H(2)O, Zn-5(OH)(8)Cl-2 center dot H2O within its outer part, predominantly composed of Cu-2(OH)(3)Cl, significantly reduce the chloride-induced corrosion compared with Cu metal. The intercalation of zinc-rich corrosion products within the patina and not at the top-surface explain their marginal influence on the runoff process that mainly occurs at the outmost surface.
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