| To improve the corrosion resistance of heat resistant stainless steels (HRSS) at high temperature, pack aluminization of these steels was performed. Two kinds of HRSS (MO-RE 1, HK40) were used for pack aluminization during which the activity of an aluminum source was varied. Various microstructures of the aluminized HRSS were studied. To evaluate and study the corrosion resistance, cyclic corrosion tests in simulated COG (coke oven gas) combustion environment were performed. After the tests, the degradation mechanisms of the pack aluminized HRSS were presented. Especially, the inward diffusion rate of aluminum in aluminized HRSS was more pronounced than that in aluminized Ni-base alloys. In addition, the pack aluminized HRSS in the medium low activity of the aluminum source showed much better corrosion resistance than the uncoated HRSS. |
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