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首页> 外文期刊>Corrosion science >High temperature steam oxidation of chromium-coated zirconium-based alloys: Kinetics and process
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High temperature steam oxidation of chromium-coated zirconium-based alloys: Kinetics and process

机译：高温蒸汽氧化铬涂料的锆基合金：动力学和工艺

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The oxidation of chromium-coated zirconium-based alloys is studied under steam at temperatures ranging from 800 degrees C up to 1500 degrees C and for oxidation times ranging from a few minutes up to a few hours. For oxidation temperatures up to 1300 degrees C, the overall oxidation kinetics is nearly parabolic at the beginning of oxidation, when the Cr outer layer is protective. Finally, it significantly accelerates and hydrogen is absorbed during a short period. These steps correspond to different oxidation and diffusion mechanisms, involving: growth of outer chromia scale; Zr-Cr interdiffusion, inducing Zr(Cr,Fe)(2) intermetallic layer thickening then disappearance due to transformation into metallic chromium and zirconia; transport of oxygen through residual chromium (in particular along grain boundaries) and into the zirconium substrate, and finally growth of a sub-coating zirconia. The additional effect of the Zr-Cr eutectic reaction occurring when the oxidation temperature is increased beyond 1300 degrees C is also studied and briefly discussed.
机译：在高达1500℃的温度范围内的温度下，在蒸汽下研究铬涂覆的锆基合金的氧化，氧化时间范围从几分钟到几个小时。对于高达1300℃的氧化温度，当Cr外层是保护性时，整体氧化动力学在氧化开始时几乎抛物线。最后，它在短时间内显着加速和氢气被吸收。这些步骤对应于不同的氧化和扩散机制，涉及：外染色尺度的生长; Zr-Cr间隔，诱导Zr（Cr，Fe）（2）金属间层增厚，然后由于转化成金属铬和氧化锆而消失;通过残留铬（特别是沿晶界）和进入锆基底的氧，最后生长亚涂层氧化锆。还研究了在氧化温度超过1300℃之后，Zr-Cr共晶反应发生的额外效果并简要讨论。

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