0Cr18Ni10Ti不锈钢热浸镀铝高温短期氧化行为

High temperature oxidation behavior of hot dipping aluminized 0Cr18Ni10Ti stainless steel during short period

采用熔剂法对0Cr18Ni10Ti热浸镀铝,通过SETSYS Evolution高温热重分析仪对0Cr18Ni10Ti热浸镀铝及0Cr18Ni10Ti不锈钢在900℃×24 h、1000℃×24 h短期氧化行为进行了研究,采用EDS、SEM对表面、截面进行了能谱分析及形貌观察。研究结果表明,热浸镀铝及不锈钢900℃×24 h、1000℃×24 h氧化动力学曲线均符合抛物线规律,热浸镀铝900℃×24 h、1000℃×24 h氧化速率分别为2.419×10-12mg/cm2·h、1.483×10-13mg/cm2·h,0Cr18Ni10Ti不锈钢900℃×24 h、1000℃×24 h氧化速率分别为3.927×10-12mg/cm2·h、6.49×10-12mg/cm2·h。热浸镀铝提高了0Cr18Ni10Ti不锈钢的抗高温氧化性。热浸镀铝900℃×24 h、1000℃×24 H高温氧化分别生成θ-Al2O3氧化物及θ-Al2O3和α-Al2O3的混合物。

0Cr18Ni10Ti stainless steel was coated by hot-dipping in a molten aluminum bath. The high temperature oxidation behaviors of the hot-dipped aluminized steel and 0Cr18Ni10Ti steel were tested at 900 ℃ and 1000 ℃ for 24 h using thermo gravimetric analyzer. The morphology was studied by SEM and the phase composition was characterized by EDS. The results of high temperature oxidation test show that oxidation kinetics of the hot-dipped aluminized steel and 0Cr18Ni10Ti steel basically accorded to parabolic rate laws at 900 ℃ and 1000 ℃. The oxidation rates of the hot-dipped aluminized steel are 2. 419 × 10-12mg/cm2·h and 1. 483 ×10-13mg/cm2·h at 900 ℃ and 1000 ℃,respectively. θ-Al2O3 is formed on the hot-dipped aluminized steel at 900 ℃. θ-Al2O3 and α-Al2O3 are formed on hot-dipping aluminum at 1000 ℃ for 24 h. With oxidation time increasing,θ-Al2O3 transformed into α-Al2O3 at 1000 ℃.