Abstract
This study aims to investigate the oxidation behaviour at high temperature of a commercial ferritic stainless steel EN 1.4509. Tests of high temperature oxidation in air were carried out under isothermal condition (950 ºC) with different exposure times in order to obtain the oxidation kinetics law associated to this material. The surface and cross-section were analysed by scanning electron microscopy and energy-dispersive X-ray spectrometry (SEM/EDS), where the oxide scales proved to be formed by an external Mn-Cr spinel and an inner chromia layer. These oxides were generated by the migration of metallic cations from the stainless steel to the atmosphere. The size of the generated spinel crystals increased when increasing the exposure time as well as the cross-section thickness did. Moreover, the surface modification of ferritic stainless steel EN1.4509 was studied when platinum is deposited on its surface. The feature of this surface-modified ferritic stainless steel against oxidative atmosphere was evaluated by SEM/EDS. This platinum deposition led to reach a different surface morphology in terms of crystal size and nature.
Highlights
The use of metallic structured catalytical reactors has attracted a great deal of attention as alternative to traditional catalyst [1]
This study aims to investigate the oxidation behaviour at high temperature of a commercial ferritic stainless steel EN 1.4509
Tests of high temperature oxidation in air were carried out under isothermal condition (950 oC) with different exposure times in order to obtain the oxidation kinetics law associated to this material
Summary
The use of metallic structured catalytical reactors has attracted a great deal of attention as alternative to traditional catalyst [1]. These structures have been manufactured with different metals and alloys. Published under licence by IOP Publishing Ltd dependence This consideration was first described by Wagner. In the field of catalysis, when stainless steel is used as a support, it undergoes thermal treatment in order to generate an oxide scale that improves the anchoring and the deposition of the active phase [5]. The deposition of platinum on ferritic stainless steel is studied for the comparison of the impact of noble metals during the oxidation reaction
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