| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Rivolta, Barbara
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024Optimization of the mechanical and corrosion resistance of Alloy 625 through aging treatmentscitations
- 2023The spinodal decomposition of ferrite in 2507 biphasic stainless steels: embrittlement and possible toughness recovery
- 2023Metallurgical Failure Analysis of Closed Water Circuit Containing Molybdate-Based Inhibitorcitations
- 2023Reverse aging of pearlitic carbon steel wire rodcitations
- 2022On the peak strength of 7050 aluminum alloy: mechanical and corrosion resistance
- 2022How to Use Metallurgical Analysis for Fire Investigation: The Case of AISI 316 Stainless Steelcitations
- 2015Development of W–SiO2 and Nb–TiO2 solar absorber coatings for combined heat and power systems at intermediate operation temperaturescitations
- 2015Development of W–SiO2 and Nb–TiO2 solar absorber coatings for combined heat and power systems at intermediate operation temperaturescitations
- 2014New Cermet Coatings for Mid-temperature Applications for Solar Concentrated Combine Heat and Power Systemcitations
- 2014New cermet coatings for mid-temperature applications for solar concentrated combine heat and power systemcitations
Places of action
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article
Metallurgical Failure Analysis of Closed Water Circuit Containing Molybdate-Based Inhibitor
Abstract
<jats:p>In this work, two industrial heating/cooling circuits are compared. One of the two systems failed in a short time showing severe corrosion damage and a through thickness crack close to one of the welds. The main difference between the circuits is the presence of a sodium molybdate-based corrosion inhibitor in the damaged one. The addition of these substances is very frequent in such applications, and they generally work very well in preventing serious corrosion attacks. Nevertheless, the technical literature reports other cases in which systems working with fluids containing such inhibitors failed prematurely. The authors performed a failure analysis of the damaged circuit focusing their attention on the regions where fluid leaks were observed because of through thickness cracks. This damage was located close to the pipe–flange weld. These zones were investigated by visual examination, radiographic and scanning electron microscope (SEM) analyses, metallographic observations by light optical microscope (LOM), Vickers micro-hardness tests and optical emission spectroscopy (OES) chemical analysis. The failure was related to the presence of severe pitting and crevice corrosion in the welded areas with the final activation of a further critical corrosion mechanism, i.e., stress corrosion cracking (SCC). In order to explain the shorter working life of the failed system, a physical model of the corrosion mechanisms acting on the two circuits was proposed.</jats:p>