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Theses

Etude de revêtements métalliques pour la protection des surchauffeurs d'usines d'incinération de déchets urbains

Abstract : At present, the combustion of household refuse in incineration plants leads to the forming of gas such as HC1 and SO2, which are very corrosive to the installation. Industrials today tend to use protective coating, less expensive than solid materials. This study is thus focused on this particular aspect, and is structured in three parts. In a first phase, a physico-chemical characterization of 8 coatings was carried out, which consisted of a thorough metallographic study (chemical composition, microstructure, hardness, porosity...) of the various coatings deposited on low carbon steel. In a second phase, all the coatings were tested in a corrosion known as "stand by" ( a corrosion due to the rehydratation of deposits and the condensation of corrosive gas.)This study was carried out through the standard electrochemical methods, in a acid environment highly concentrated in chlorides, simulating the conditions met by the industries. In a same type of conditions the influence of the oxydes obtained after differents thermals processings (variations in the temperature and the durations) were studied. This study thus allowed us to determine which oxides give the best protection against this type of corrosion. Finally, a protocol for testing the various coatings in incineration conditions has been completed. For this purpose, three temperatures and two gas composition were used. The coatings were embedded in incinerator deposits and tested in those conditions. After these tests, the observations of the samples allowed us to go back to the degradation mechanisms and to establish a classification. This classification seems to be in good agreements with industrials tests realized in plants.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2000_0076_STOCK.pdf
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https://hal.univ-lorraine.fr/tel-01746456
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Submitted on : Thursday, March 29, 2018 - 10:38:11 AM
Last modification on : Wednesday, March 24, 2021 - 10:24:04 AM

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  • HAL Id : tel-01746456, version 1

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Pierre-Côme Stock. Etude de revêtements métalliques pour la protection des surchauffeurs d'usines d'incinération de déchets urbains. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2000. Français. ⟨NNT : 2000NAN10076⟩. ⟨tel-01746456⟩

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