Evaluation of the Corrosion Resistance of Thermal-Spray Coatings Under Oxidant Atmosphere in a Fluid Catalytic-Cracking Unit |
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| Authors: | Rizzo F Monteiro M Lopes MF Caminha I Zeng C Piza Paes M |
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| Affiliation: | (1) Departmento de Ciências dos Materiais e Metalurgia, Pontifícia Universidade Católica do Rio de Janeiro, Rua Marquês de São Vicente, 225, Gávea, Rio de Janeiro, Brasil, CEP, 22 453–900;(2) Instituto Nacional de Tecnologia/Laboratório de Metalografia e de Dureza, Av. Venezuela, 82, sala 626, Centro, Rio de Janeiro, Brasil, CEP, 20081-310;(3) Institute of Corrosion and Protection of Metals, State Key Laboratory for Corrosion and Protection/The Chinese Academy of Science, Shenyang, 110015, China;(4) Petrobrás/Cenpes/Supep/Diplot/Semec, Cidade Universitária, Quadra 7, Ilha do Fundão, Rio de Janeiro, Brasil, CEP 21949–900 |
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| Abstract: | The effectiveness of several thermal-spray coatings for improving the corrosion resistance of a low-alloy steel was evaluated at 650°C under two conditions: an oxidizing atmosphere in a fluid catalytic-cracking regenerator of a petrochemical unit and a simulated laboratory atmosphere. The high porosity present in all coatings studied in the present work, inherent to the thermal-spray technique, allowed the penetration of gaseous species from the atmosphere into the substrate, leading to the formation of nonprotective oxides and sulfides, as well as internal oxidation, sulfidation, and nitridation. A protective alumina and/or chromia layer did not form, probably due to the relatively low temperature used in both the real and simulated conditions. Characterization of the phases present in the oxidized layer was carried out by X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM) with X-ray energy-dispersive analysis (EDS). |
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| Keywords: | thermal-spray coatings diffusion oxidation sulfidation internal precipitation |
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