研究了固溶态316LN不锈钢在900～1200℃空气中的氧化行为。结果表明,316LN不锈钢在900～1200℃范围内氧化增重与氧化时间的关系遵从抛物线规律,氧化速率常数kT随温度的升高而增大;316LN不锈钢的高温氧化具有选择性,氧化首先发生于富Cr的晶界处;900℃时氧化轻微,氧化膜主要为Cr2O3,1000℃时氧化膜组成为Cr2O3和尖晶石结构的MnCr2O4,1200℃时除Cr2O3和MnCr2O4外,还存在少量的FeCr2O4。316LN不锈钢的氧化激活能为278.765 kJ/mol,氧化速率常数为8.05×105exp{-278265/（RT）}。
Isothermal oxidation behavior of 316LN stainless steel at solution state at temperatures of 900-1200 ℃ in air was investigated. The results show that isothermal oxidation kinetics of 316LN stainless steel follows parabolic law in the temperature range of 900 ℃ to 1200 ℃. The oxidization rate constant kr increases as temperature elevating. The oxidation of 316LN stainless steel exhibits selectivity, which starts from the chromium-enriched gain boundaries. At 900 ℃ , oxidation occurs slightly and the oxide scales mainly are composed of Cr2O3 , which mainly consist of Cr2O3 and MnCr2O4 with spinel structure at 1000 ℃. At 1200 ℃ , besides Cr2O3 and MnCr2O4 , the oxide scales also contain a little of FeCr2O4. Isothermal oxidation activate energy of 316LN stainless steel is 278. 765 kJ/mol, and isothermal oxidation rate constant is 8.05 × 105exp{ -278265/（RT）}.
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