Abstract
In this study, we investigated the effect of the pretreatment of FeCrAlloy®, which is known to have excellent high-temperature durability, for the development of a catalytic microchannel reactor for a reverse water–gas shift reaction in a high-temperature environment. The characteristics of the pretreated surface, which were varied according to the chemical and/or thermal surface pretreatment methods, were experimentally investigated. Chemical surface pretreatment was performed using acetone, basic solution, and acidic solution. Thermal surface pretreatment was performed according to the method suggested in the work of Katheria et al. The pretreated surface condition and composition were analyzed by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD). Through these analyses, qualitative and quantitative analysis was conducted on the pretreated surface and an alumina whisker was observed in the pretreated substrate. In addition, the primer slurry was coated on the substrates and the adhesion test was conducted according to the pretreatment method.
Highlights
X-ray spectroscopy (EDS, SU8230, Hitachi, Tokyo, Japan) and X-ray diffraction
Alumina whiskers were observed on the substrate treated treatment methods 2, 3, and 4, the corroded surfaces were foundwith in several treatment methods
The surface pretreatments of the FeCrAlloy substrate were performed through various chemical treatments and a thermal treatment
Summary
The surface pretreatment was performed on the same substrate with a mixed solution of HCl and HNO3. These were denominated with aluminizing pretreatment and acid pretreatment, respectively. Were used to prepare an alumina sol and a suspension of pH 3.5, and the acid pretreatment substrate was coated with alumina sol, dried, and calcined at 600 °C for 5 h. The surfaces before and after coating were compared through two pretreatment methods, and it was confirmed that there was no crack on the aluminizing pretreated substrate, and the weight loss was 1.24%, which was relatively lower than that of the acid pretreatment.
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