| 441铁素体不锈钢在模拟汽车废气环境中的氧化行为 |
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| 引用本文： | 陈以生,詹建明,倪清钊,李谋成. 441铁素体不锈钢在模拟汽车废气环境中的氧化行为[J]. 腐蚀科学与防护技术, 2019, 31(2): 174-180. DOI: 10.11903/1002.6495.2018.217 |
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| 作者姓名： | 陈以生 詹建明 倪清钊 李谋成 |
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| 作者单位： | 1. 上海大学材料研究所 上海 2000722. 上海大学材料基因组工程研究院 上海 200444 |
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| 摘 要： | 采用增重法研究了441铁素体不锈钢在模拟汽车废气环境中于900~1050 ℃范围内的氧化行为。运用XRD、SEM以及EDS技术分析了试样表面氧化膜的形貌和结构特征。结果表明，441铁素体不锈钢在汽车废气环境中的上限服役温度在900 ℃左右，该温度下形成的氧化膜为双层结构，外层的Mn-Cr尖晶石层和内部的Cr2O3层。当氧化温度升到950 ℃及以上时，氧化膜上出现瘤状氧化物，氧化物瘤沿初期Mn-Cr尖晶石层两侧分布，外部主要是铁的氧化物，内部为铁铬氧化物。氧化温度达到1050 ℃时，氧化物瘤内部会形成较多空隙。氧化物瘤的生长导致发生失稳氧化，并使氧化动力学从抛物线规律转变为直线规律。
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| 关 键 词： | 铁素体不锈钢 高温氧化 汽车废气 失稳氧化 |
| 收稿时间： | 2018-10-19 |
Oxidation Behavior of Type 441 Ferritic Stainless Steel in Synthetic Exhaust Gas |
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| Yisheng CHEN,Jianming ZHAN,Qingzhao NI,Moucheng LI. Oxidation Behavior of Type 441 Ferritic Stainless Steel in Synthetic Exhaust Gas[J]. Corrosion Science and Protection Technology, 2019, 31(2): 174-180. DOI: 10.11903/1002.6495.2018.217 |
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| Authors: | Yisheng CHEN Jianming ZHAN Qingzhao NI Moucheng LI |
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| Abstract: | The oxidation behavior of type 441 ferritic stainless steel in a synthetic automotive exhaust gas at 900~1050 ℃ was studied by means of mass change measurement, XRD, SEM and EDS. The results indicate that the oxide scale formed at 900 ℃ has a bi-layered structure, i.e., an outer Mn-Cr spinel layer and an inner Cr2O3 layer, while the temperature 900 ℃ is known as the upper service limit for the type 441 ferritic stainless steel in automotive. When the oxidation temperature increases to 950 ℃ and above, oxide nodules appears on the oxide scale. A nodule usually can be differentiated into two parts by the initial formed Mn-Cr spinel layer, Fe-oxides and Fe-Cr oxides mainly form on top of and beneath the spinel thin layer respectively. When the oxidation temperature reaches 1050 ℃, many voids form in the oxide nodules. The growth of oxide nodules leads to breakaway oxidation, therewith, changes the oxidation kinetics from parabolic to linear. |
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| Keywords: | ferritic stainless steel high temperature oxidation automotive exhaust gas breakaway oxidation |
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