Cyclic Oxidation Resistance of Hot-Dipping Aluminized Steel

Abstract:

0Cr18Ni10Ti stainless steel was coated by hot-dipping in a molten aluminum bath, and then diffusing annealing at 950 °C for 2h. Aluminized steel was composed of three layers: outer layer FeAl₂ phase and FeAl phase, intermediate layer FeAl phase, and inner solid solution with Al. The cyclic oxidation resistance of aluminized steel with outer layer and aluminized steel without outer layer were tested at 900 °C for 24 cycles using resistance furnace. Morphology, and phase composition, element distribution of the oxide scale were characterized by XRD, SEM and EDS. The oxidation result showed that weight loss on aluminized steel with outer layer was observed at early stage, weigh gain was obtained slowly at later stage, while the weight gain was observed on aluminized steel without outer layer during 24 cycles. The weigh gain of both samples was about 0.7mg/cm² after 24 cycles. It was found that cracks on aluminized steel with outer layer were more than aluminized steel without outer layer due to thicker FeAl layer on aluminized steel with outer layer. A thin NiAl phase layer was found between FeAl layer and inner solid solution layer on both samples decrease the depletion rate of aluminum.

• Periodical: Materials Science Forum (Volume 852)
• Pages: 9-13
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.852.9
• Online since: April 2016
• Authors: Jin Lou, Cheng Xiang Ruan
• Keywords: Cyclic Oxidation Resistance, FeAl Phase, Hot-Dipping Aluminum

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