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Early stage oxidation of AISI 304 stainless steel: role of temperature and oxygen pressure

机译：AISI 304不锈钢的早期氧化：温度和氧气压力的作用

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摘要

We address the nucleation and growth features of transient films produced in the initial stages of austenitic stainless steel oxidation, prior to the establishment of the steady-state oxide, as well as the effect of temperature and atmosphere composition on the oxidation process. Specimens of cold rolled AISI 304 strips were isothermally oxidised in the temperature range between 700 and 1200 deg C under controlled atmosphere conditions (air or O_2/N_2 gas mixtures) for time intervals ranging between a few seconds and a maximum of 1200 seconds. Thermogravimetric experiments were conducted only for the higher temperatures (> 1000 deg C) where mass gain can be appreciated for such short oxidation times. The thickness, composition and morphological characterisation of the oxide films present on the oxidised specimens were carried out by using glow discharge optical emission spectroscopy (GDOES) and by scanning electron microscopy (SEM). The experimental results indicate the occurrence of different oxidation behaviour for AISI 304 which depend on temperature and on oxygen pressure. AISI 304 is able to form a protective oxide layer rich in Cr_2O_3 upon isothermal oxidation when the atmosphere is rich in oxygen (air or O_2-N_2 gas mixture with 3 percent or 9 percent O_2) and for temperatures higher than 1000 deg C. The role of the oxygen concentration seems to be negligible in the low temperature range 700-900 deg C.
机译：我们讨论了在建立稳态氧化物之前，在奥氏体不锈钢氧化初始阶段产生的过渡膜的形核和生长特征，以及温度和气氛组成对氧化过程的影响。在受控气氛条件下（空气或O_2 / N_2气体混合物），在700至1200摄氏度的温度范围内，将AISI 304冷轧带钢样品进行等温氧化，时间间隔介于几秒钟到最多1200秒之间。仅在较高的温度（> 1000摄氏度）下进行热重实验，其中在如此短的氧化时间内可以实现质量增加。通过使用辉光放电光发射光谱法（GDOES）和通过扫描电子显微镜（SEM）对存在于氧化试样上的氧化膜的厚度，组成和形态特征进行了分析。实验结果表明，AISI 304会发生不同的氧化行为，这取决于温度和氧气压力。当大气中富含氧气（空气或O_2-N_2气体混合物中O_2为3％或9％）且温度高于1000摄氏度时，AISI 304能够在等温氧化后形成富含Cr_2O_3的保护性氧化物层。在700-900℃的低温范围内，氧浓度的10％似乎可以忽略不计。

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