Tribaloy^TM alloys are well-known as wear-resistant alloys, however, their oxidation kinetics and mechanisms are not well studied, especially their long-term oxidation behavior. In this work, the long-term isothermal oxidation behavior of Tribaloy^TM T400 and T800 in synthetic air at 900 °C for up to 1000 h was investigated. The mass gains of the samples were continuously recorded during the experiments with a thermobalance. Post mortem inspection of the samples was performed and the oxidation mechanism was analyzed. The results show that T800 has a better oxidation resistance than T400. The parabolic rate constant k_p of T800 is 4.9·10⁻¹⁴ g²·cm⁻⁴·s⁻¹, which is approximately one order of magnitude lower than 4.8·10⁻¹³ g²·cm⁻⁴·s⁻¹ for T400. The penetration depth of the oxides in T800 is less than half of that in T400 and steady state oxidation is attained after approximately 200 h, compared to 350 h for T400. The better oxidation resistance of T800 correlates with its higher Cr content whereby protective Cr₂O₃ scales form more readily.

Tribaloy ^TM合金是众所周知的耐磨合金，但是，它们的氧化动力学和机理尚未得到很好的研究，特别是它们的长期氧化行为。在这项工作中，研究了Tribaloy ^TM T400和T800在900°C的合成空气中长达1000 h的长期等温氧化行为。在实验过程中，使用热天平连续记录样品的质量增益。对样品进行验后检查并分析了氧化机理。结果表明，T800具有比T400更好的抗氧化性。T800的抛物线速度常数k _p为4.9·10 ^-14  g ² ·cm ^-4 ·s ^-1，其比T400的4.8·10 ^-13  g ² ·cm ^-4 ·s ^-1大约低一个数量级。T800中氧化物的渗透深度小于T400中氧化物的渗透深度，并且在大约200小时后达到稳态氧化，而T400为350小时。T800更好的抗氧化性与其较高的Cr含量相关，从而更容易形成保护性Cr ₂ O ₃氧化皮。