Browsing by Author "Abdullah T. K"

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    Low-Temperature Slurry Aluminizing: Investigating the Influence of Aluminizing Time on the Corrosion Performance of Aluminide Coating on 304 SS
    (Published by IOP Science UK,, 2024-12-26) AMBALI IBRAHIM OWOLABI; Anasyida A. S; Abdullah T. K
    The surface of austenitic stainless steel (304 SS) was modified with aluminium and alumina powders using a slurry aluminizing route to enhance its lifespan at high temperatures. The substrate was subjected to low heat treatment temperature (680°C) at various aluminizing times (4, 6, 8, and 10 hours). The corrosion resistance of the aluminide coating was evaluated by exposing them to a mixture of molten solar salt containing 60 wt.% NaNO3 and 40 wt.% KNO3 at 600°C for 100 hours. The coatings were characterized using FESEM, EDX, and XRD. Coating thickness, hardness, multi-layered phases, and corrosion products were determined before and after corrosion. The results indicated that a dense and continuous inner layer made up of FeAl-based intermetallic improved the corrosion resistance of 304SS. Coating thickness increased with increasing aluminizing time, with a maximum thickness of 75.12 μm observed for samples with 10 hours of aluminizing. The highest coating hardness of 1060 HV was observed on Fe2Al5 of aluminide layer heat treated at 10 hours. The corrosion product found on the aluminide layer was NaAlO2 and the sample heat treated for 6 hours exhibited the lowest corrosion rate of 0.21 mm/year.