2.25Cr-Mo鋼在540~1100℃之高溫氧化行為研究

The Oxidation Behavior of the 2.25Cr-Mo Steel at 540~1100℃ in Air

本文探討純Fe及2.25Cr-Mo鋼於空氣下，溫度540~1100℃間的高溫氧化行為。研究結果顯示，2.25Cr-Mo鋼在各種溫度下之腐蝕動力學皆遵守拋物線型定律，且在800~1000℃時，呈現明顯的兩段式拋物線型行為。2.25Cr-Mo鋼比純鐵具有較佳的抗氧化能力，但其氧化速率之快慢則隨溫度高低而異，於540℃，2.25Cr-Mo鋼之氧化速率較純鐵約可降低2.38個數量級。經XRD分析結果顯示，2.25Cr-Mo鋼之氧化生成物以Fe2O3為主，並含有少量的FeCr2O4，少量FeCr2O4的生成是提昇抗氧化能力的主要因。

The oxidation behavior of pure Fe and the 2.25Cr-Mo steel was studied over the temperature range 540~1100℃ in air. The results indicated that the oxidation kinetics of both pure Fe and the 2.25Cr-Mo steel followed the parabolic law, although two-stage kinetics were noted for the steel at 800~1000℃. The oxidation rates of the steel are generally lower than those of pure Fe, whose magnitudes strongly depend on temperature. A typical oxidation rate of the steel is about 2.38 orders of magnitude lower than of pure Fe at 540℃. The scales formed on the steel surface by XRD analysis consisted of mostly Fe2O3 and minor FeCr2O4. The formation of FeCr2O4 is responsible for the oxidation-resistant improvement of the steel.