Abstract
In the present work, the corrosion resistance of an ASTM A 387 G11 steel was evaluated under two conditions: an oxidizing atmosphere in a fluid catalytic cracking regenerator of a petroleum processing unit and a simulated atmosphere in the laboratory, at temperatures of 650 °C and 700 °C. The 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). Severe corrosion was observed after exposure to both the real and simulated conditions, with formation of several iron oxides (Fe2O3, Fe3O4 and FeO) in the product scale layer, as well as a slight inner oxidation and sulfidation of chromium in the substrate. Internal nitridation of the silicon and the manganese was observed only in the real condition, probably related to the long-term exposure inside the regenerator.
Highlights
Corrosion of materials may represent a heavy burden for industry in general, especially for the petroleum industry where the oil and gas compositions are responsible for reducing the service life of component materials of equipment due to severe corrosion attack and, to considerable expenses related to the maintenance and replacement of parts in a processing unit[1,2,3,4]
For the degradation of specimens in service, designated “real condition”, the samples were fixed inside the regenerator of a fluid catalytic cracking unit, in the stand pipe well and orifice chamber regions, under an oxidant atmosphere provided by the burning of the coke adhered to the catalyst
Severe corrosion was observed for both samples exposed to the oxidizing atmosphere inside the regenerator at the temperatures of 650 °C and 700 °C
Summary
Corrosion of materials may represent a heavy burden for industry in general, especially for the petroleum industry where the oil and gas compositions are responsible for reducing the service life of component materials of equipment due to severe corrosion attack and, to considerable expenses related to the maintenance and replacement of parts in a processing unit[1,2,3,4]. Thermally sprayed aluminum coatings have been successfully used for the protection of offshore and marine structures, due to its good corrosion resistance and consequent increase in the service life of metallic parts and equipments. The corrosion resistance of an ASTM A 387 G11 low alloy steel was evaluated This steel is widely employed in the manufacture of pressure vessels designed for elevated temperature service. Materials Research such as thermal generation plants, because the understanding of the corrosion mechanisms at elevated temperature will allow for the optimization of the alloy and coating compositions used in such systems
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